here are the posts in the order they were written. Scroll down to the post number you are looking for, click on the link, and it will take you right to it.
- 1 Perfect Square
- 2 Gross Multiplication Facts
- 3 Puzzles for a November Day
- 4 Rhyme and Rhythm
- 5 Easy as 1-2-3
- 6 A Piece of Cake
- 7 Spaghetti and Meatballs for All!
- 8 What Happens When Puzzle Dimensions Change?
- 9 Remembering 50 Years Ago
- 10 Just Like Sudoku?
- 11 Counting Blessings
- 12 The Doorbell Rang
- 13 Mikulás
- 14 Oh Christmas Tree
- 15 is the Magic Sum of a 3 x 3 Magic Square
- 16 Silver Bells
- 17 Christmas Angels
- 18 Up on the Housetop
- 19 Last-Minute Gift
- 20 Underestimation
- 21 Factors of the Year 2013 and 2014
- 22 Factor Trees
- 23 You Call That a Multiplication Table? THIS is a Multiplication Table
- 24 Think You Have a Snow Problem? Try This:
- 25 and Level 3
- 26 and Level 4
- 27 There Are Polar Bears Round The Ice-Fishing Hole
- 28 and Level 5 Snowflake
- 29 and A Level 6 Snowball
- 30 and Pieces of Pi
- 31 and Every Third Grader Should Know
- 32 and Hooked on Factoring
- 33 and Some Divisibility Tricks for 3 and 9
- 34 and Step by Step Level 3
- 35 and Pushing an Easy Button
- 36 and The Six Word Challenge
- 37 and How Many Trapezoids I Can Draw
- 38 and Factor Finding
- 39 and Seriously Hooked on Factoring
- 40 and M.C. Escher
- 41 and Life Is Like A Sudoku Puzzle
- 42 and A Topological Puzzle
- 43 and Find the Factors
- 44 and Games again…
- 45 and A Change in Order
- 46 and South East Arrow Puzzle
- 47 and Understanding the Equal Sign with Candy
- 48 and What’s wrong with this?
- 49 and V is for Victory Puzzle
- 50 and Multiples
- 51 and Magic forcing grid – Maths Magic
- 52 and Maths in the snow
- 53 and Animated Gif FIND THE FACTORS Level 5
- 54 and How Many Squares Are in This Puzzle?
- 55 and Square Roots for Third Grade
- 56 and Level 2
- 57 and Cupid’s arrow is on its way!
- 58 and OXOXOXOXOXOXOX
- 59 and Valentine Gif
- 60 and Pay No Attention to That Man Behind the Curtain
- 61 and Opportunity to Catch Up
- 62 and Love: Challenging But Worth It
- 63 and Twelve Quick Clues
- 64 and Can You See the Logic Here?
- 65 is the Magic Sum of a 5 x 5 Magic Square
- 66 and Fractal line
- 67 and How to get more blog followers
- 68 and Happy Saint Patrick’s Day!
- 69 and Six!
- 70 and Level 2
- 71 and Level 3
- 72 and Level 4
- 73 and Once
- 74 and Level 5
- 75 and Level 6
- 76 and Level 1
- 77 and Level 2
- 78 and Patterns of Ideas (Hardy)
- 79 and Level 3
- 80 and A Puzzled Cat
- 81 and Level 5
- 82 and Level 6
- 83 and Level 1
- 84 and Level 2
- 85 and Level 3
- 86 and Level 4
- 87 and Level 5
- 88 and April Showers
- 89 and Level 1
- 90 and Level 2
- 91 and River crossings
- 92 and Level 3
- 93 and Level 4
- 94 and Level 5
- 95 and Level 6
- 96 and Level 1
- 97 and Will This Six-legged Puzzle Bug You?
- 98 and What Do You Do When You Get to the End of a Shoe Lace?
- 99 and Level 4
- The 100th Day of School
- 101 and Level 6
- 102 and Level 1
- 103 and Level 2
- 104 and Level 3
- 105 and Level 4
- 106 and Level 5
- 107 and Level 6
- 108 and Level 1
- 109 and Level 2
- 110 and Level 3
- 111 and How Well Can You Add and Subtract in All Those Foreign Languages in Which You’ve Learned How to Count?
- 112 and Level 4
- 113 and Level 5
- 114 My daughter – a new wife with a new life
- 115 and Level 6
- 116 and Level 1
- 117 and Level 2
- 118 and Level 3
- 119 and Level 4
- 120 and Level 5
- 121 and Level 6
- 122 and Level 1
- 123 and Level 2
- 124 and Level 3
- 125 and Level 4
- 126 and Level 5
- 127 and Level 6
- 128 and Level 1
- 129 and Level 2
- 130 and Level 3
- 131 and Level 4
- 132 and The Hourglass Is Almost Empty
- 133 and Level 6
- 134 and Level 1
- 135 and Level 2
- 136 and Level 3
- 137 and Level 4
- 138 and Divisibility Tricks 4 You
- 139 and Level 5
- 140 and Gr-8 Divisibility Tricks
- 141 and Level 6
- 142 and Level 1
- 143 and Level 2
- 144 and Level 3
- 145 and Level 4
- 146 and Level 5
- 147 and Level 6
- 148 and Level 1
- 149 and Level 2
- 150 and Level 3
- 151 and Why you shouldn’t even bother with that divisibility trick for 9 and 3
- 152 and Level 4
- 153 and Level 5
- 154 and Level 6
- 155 and Level 1
- 156 and Level 2
- 157 and Level 3
- 158 and Level 4
- 159 and Level 5
- 160 and Level 6
- 161 and Level 1
- 162 and Level 2
- 163 and Level 3
- 164 and Level 4
- 165 and Level 5
- 166 and Level 6
- 167 and Level 1
- 168 and the Very Inspiring Blogger Award
- 169 and Level 2
- 170 and Level 3
- 171 and Level 4
- 172 and Level 5
- 173 and Level 6
- 174 and Level 1
- 175 and Level 2
- 176 and Level 3
- 177 and Level 4
- 178 and Level 5
- 179 and Level 6
- 180 and Level 1
- 181 and Level 2
- 182 and Level 3
- 183 and Level 4
- 184 and Level 5
- 185 and Level 6
- 186 and Level 1
- 187 and Level 2
- 188 and Level 3
- 189 and Level 4
- 190 and Level 5
- 191 and Level 6
- 192 and Level 1
- 193 and Level 2
- 194 Are Multiplication Rhymes Able to Help Kids Learn the Multiplication Table?
- 195 and Level 3
- 196 and Level 4
- 197 and Level 5
- 198 and Level 6
- 199 My List of Multiplication Rhymes
- 200 and Level 1
- 201 and World Elephant Day
- 202 and Level 2
- 203 and Level 3
- 204 and Level 4
- 205 and Level 5
- 206 and Level 6
- 207 and Level 1
- 208 and Level 2
- 209 and Level 3
- 210 and Level 4
- 211 and Level 5
- 212 and Level 6
- 213 and Level 1
- 214 and Level 2
- 215 and Level 3
- 216 and Level 4
- 217 and Level 5
- 218 and Level 6
- 219 and Level 1
- 220 and Level 2
- 221 and Level 3
- 222 and Level 4
- 223 and Level 5
- How Many Factors Does 224 Have, and Why Does It Have That Many?
- 225 and Level 6
- 226 and Level 1
- 227 and Level 2
- 228 and Level 3
- 229 and Level 4
- 230 and Level 5
- 231 and Level 6
- 232 and Level 1
- 233 and Level 2
- 234 and Level 3
- 235 and Level 4
- 236 and Level 5
- 237 and Level 6
- 238 and Level 1
- 239 and Level 2
- A Forest of 240 Factor Trees
- 241 and Level 3
- 242 and Level 4
- 243 and Level 5
- 244 and Level 6
- 245 – The Last of Four Consecutive Numbers
- 246 and Level 1
- 247 and Level 2
- 248 and Level 3
- 249 and Level 4
- 250 and Level 5
- 251 and Level 6
- 252 How likely can this square root be simplified?
- 253 and Level 1
- 254 and Level 2
- 255 and Level 3
- 256 and Level 4
- 257 and Level 5
- 258 and Level 6
- 259 and Level 1
- 260 Some Thoughts on Those Four Consecutive Numbers
- 261 and Level 2
- 262 and Level 3
- 263 How and Why You Should Show Your Work
- 264 and Level 4
- 265 and Level 5
- 266 Why 8 Consecutive Numbers with 6 Factors is Impossible
- 267 and Level 6
- 268 and Level 1
- 269 and Five More Consecutive Square Roots
- 270 and Level 2
- 271 and Level 3
- 272 and Level 4
- 273 and Level 5
- 274 and Level 6
- 275 Are First-Graders Too Young to Learn About Odd and Even Numbers?
- 276 and Level 1
- 277 and Level 2
- 278 and Level 3
- 279 How to Add and Subtract 5 with Secret Identities
- 280 and Level 4
- 281 and More Consecutive Square Roots
- 282 and Level 5
- 283 and Level 6
- 284 and Level 1
- 285 and Level 2
- 286 and Level 3
- 287 and Level 4
- 288 and Level 5
- 289 and Level 6
- 290 and Level 1
- 291 and Level 2
- 292 and Level 3
- 293 and Level 4
- 294 and Level 5
- 295 and Level 6
- 296 and Level 1
- 297 and Level 2
- 298 and Level 3
- 299 and Level 4
- Integers (up to 300) with the Same Number of Factors
- 301 and Level 5
- 302 and Level 6
- 303 and Level 1
- 304 and Level 2
- 305 and Level 3
- 306 and Level 4
- 307 and Level 5
- 308 and Level 6
- 309 and a Birthday Cake
- 310 and Level 1
- 311 and Level 2
- 312 and Virgács
- 313 and Memorizing One Seventh
- 314 and The Pi Day of Our Lives
- 315 Christmas Factor Trees
- 316 Christmas Factor Trees
- 317 and Candies from Mikulás
- 318 Christmas Factor Tree Gif
- 319 and Level 2
- 320 Christmas Factor Trees
- 321 I Heard the Bells on Christmas Day
- 322 and a Note of Music
- 323 and Level 1
- 324 Christmas Factor Trees
- 325 is a Triangular Number
- 326 Tiny Christmas Factor Tree
- 327 and Level 5
- 328 and Level 6
- 329 and A Last Minute Gift
- 330 Christmas Factor Trees
- 331 and Hockey Sticks
- 332 and a Christmas Star
- 333 and Level 5
- 334 and Level 6
- 335 and Level 1
- 336 and Level 2
- 337 What Will Be the Factors of 2015?
- 338 Liebster Award or Not
- 339 and Level 4
- 340 and Level 5
- 341 is the smallest composite number that gives a false positive for this Quick Prime Number Test
- 342 and Level 6
- 343 and a Few Changes
- 344 and Level 2
- 345 and Level 3
- 346 and Level 4
- Prime Number Tests for 347
- 348 and Level 5
- 349 and Level 6
- 350 and Level 1
- 351 is a Triangular Number
- Square Roots up to √352 That Can Be Simplified
- 353 and Level 3
- 354 and Level 4
- 355 and Level 5
- 356 and Level 6
- 357 Equality, Mathematics, and Dr. Martin Luther King, Jr.
- 358 and Level 1
- 359 and Level 2
- 360 What Can You Do With Fraction Circles?
- 361 Do You See a Pattern?
- 362 and Level 3
- 363 and Level 4
- 364 and Level 5
- 365 and Level 6
- 366 and a Quote from Euclid
- 367 and Level 1
- 368 and a Few Sequences
- 369 and Level 2
- 370 and Level 3
- 371 What Pythagorean Triple Comes Next?
- 372 and Level 4
- 373 Prime Numbers and Pythagorean Triples
- 374 and Level 5
- 375 and Level 6
- 376 Happy Birthday, Doug
- 377 and Level 1
- 378 Do You See a Pattern?
- 379 and Level 2
- 380 and Level 3
- 381 and Level 4
- 382 and Level 5
- 383 is in only one Pythagorean triple, and it’s primitive
- 384 and Level 6
- 385 Is a Square Pyramidal Number
- 386 and Level 1
- 387 and Level 2
- 388 and Level 3
- 389 How to Know if a Prime Number is the Hypotenuse in a Primitive Pythagorean Triple
- 390 and Level 4
- 391 To a Wild Rose
- 392 Happy Valentine’s Day
- 393 and A Chance to Solve a Problem
- Pythagorean Triples with 394
- 395 and Level 2
- 396 What Pythagorean Triple Comes Next?
- 397 and Level 3
- 398 and Level 4
- 399 and Level 5
- 40% of Numbers Up To 400 Have Square Roots That Can Be Simplified
- 401 and Level 6
- 402 and Passing Along The Spectacular Blog Award
- 403 and Level 1
- 404 and Level 2
- 405 and Level 3
- 406 and Level 4
- 407 What’s the Logical Thing to Do, Spock?
- 408 and Level 6
- 409 Happy Birthday, John!
- 410 Is The Sum of Two Squares Two Different Ways
- 411 Some Things You Should Know Before You Start a Blog
- 412 and Level 1
- 413 and Level 2
- 414 and Level 3
- 415 and Level 4
- 416 and Level 5
- 417 and Level 6
- A Teacher Affects Eternity and Divisibility Tricks Applied to 418
- 419 and Level 1
- 420 Factor Trees
- 421 and Level 2
- 422 and Level 3
- 423 and Level 4
- 424 and Level 5
- 425 and Level 6
- 426 My Response to a Pi-lish Question
- 427 and Level 1
- 428 St. Patrick’s Day Smile
- Level 3 and Divisibility Tricks Applied to 429
- 430 and Level 4
- 431 and Level 5
- How to Simplify √432
- 433 The Whole Is Greater Than the Sum of Its Parts
- 434 Going Backwards Is Important!
- 435 is a Hexagonal Number
- 436 Pythagorean Triples and Level 3
- 437 and Level 4
- 438 and Level 5
- 439 and Level 6
- 440 Can You Appreciate a Good Paradox?
- 441 Consecutive Numbers
- 442 and Level 1
- 443 and Level 2
- 444 and Level 3
- 445 and Level 4
- Eight Ways to Make 446 with Three Squares
- 447 and Level 6
- 448 Because He Lives
- 449 and Level 1
- How to Simplify √450
- 451 and Level 3
- 452 and Level 4
- 453 Happy Golden Anniversary to Alan and Jill
- 454 and Level 5
- 455 and Level 6
- 456 An Inchworm Measuring Marigolds
- 457 A Pythagorean Triple Logic Puzzle
- 458 and Level 1
- 459 and Level 2
- 460 Happy Birthday, Tim!
- 461 and Level 3
- 462 and Level 4
- 463 and Level 5
- 464 and Level 6
- 465 Looking for Aunt Betty
- 466 and Level 1
- 467 and Level 2
- 468 and Level 3
- 469 and Level 4
- 470 Greatest Common Factors of Pythagorean Triples.
- 471 and Level 5
- How to Simplify √472
- Just a Little 473 Cake
- 474 and Level 1
- 475 and Level 2
- 476 and Level 3
- 477 and Level 4
- 478 in Several Languages and Level 5
- 479 and Level 6
- 480 The Very Inspiring Blogger Award
- 481 and Level 1
- 482 and Level 2
- 483 and Level 3
- 484 and Level 4
- 485 and Level 5
- Finding √486 and Level 6
- 487 The Forgon Family Tree
- 488 and Level 1
- 489 and Level 2
- 490 and Level 3
- 491 and Level 4
- Simplifying √492 and Level 5
- 493 and Level 6
- 494 My First Microfilm Treasure Hunt
- 495 and Level 1
- Perfect Number 496 and Level 2
- 497 and Level 3
- 498 and Level 4
- 499 and Level 5
- 500 Pick Your Pony! Who’ll Win This Number of Factors Horse Race?
- 501 and Level 6
- 502 and Level 1
- 503 and Level 2
- 504 and Level 3
- 505 and Level 4
- 506 and Level 5
- 507 and Level 6
- 508 A Mathematical and Biblical Truth: 2 > 1
- 509 and Level 1
- 510 and Level 2
- 511 Collaborators
- 512 Ants and Level 4
- Square Roots Up to √513 That Can Be Simplified
- 514 and Level 5
- 515 and Level 6
- 516 Is an Untouchable Number
- 517 and Level 2
- 518 and Level 3
- 519 and Level 4
- 520 and Level 5
- 521 and Level 6
- 522 Gustáv Forgon and Mária Csörnök
- 523 and Level 1
- 524 and Level 2
- 525 and Level 3
- 526 is a Centered Pentagonal Number
- 527 and Level 5
- 528 and Level 6
- Is 529 an Interesting Number?
- 530 and Level 1
- 531 and Level 2
- 532 and Level 3
- 533 and Level 4
- 534 and Level 5
- 535 and Level 6
- 536 Family Reunion
- 537 and Level 1
- 538 and Level 2
- Simplifying √539 and Level 3
- 540 and Level 4
- 541 and Level 5
- 542 and Level 6
- 543 Arithmetic and Genealogy
- 544 and Level 1
- 545 and Level 2
- 546 and Level 3
- 547 and Level 4
- 548 and Level 5
- 549 and Level 6
- 550 Godparents
- 551 and Level 1
- Level 2 and Simplifying √552
- 553 and Level 3
- 554 and Level 4
- 555 and Level 5
- 556 and Level 6
- 557 Hungarian Genealogy Dictionaries
- 558 and Level 1
- 559 and Level 2
- 560 and Level 3
- 561 gives a false positive to these 102 prime number tests
- 562 and Level 4
- 563 and Level 5
- 564 and Level 6
- 565 and Level 1
- 566 and Level 2
- 567 and Level 3
- 568 and Level 4
- 569 and Level 5
- 570 and Level 6
- 571 Family Time
- 572 and Level 1
- 573 and Level 2
- 574 Start at the top of the first column and fly down one cell at a time to solve this Level 3 puzzle
- 575 and Level 4
- 576 and Level 5
- 577 and Level 6
- 578 When I stopped teaching about thousands, it made a BIG difference
- 579 and Level 1
- 580 and Level 2
- 581 and Level 3
- 582 and Level 4
- 583 The secret to solving these puzzles is using logic and never guessing
- 584 and Level 6
- What can you see in the number 585?
- 586 and Level 1
- 587 and Level 2
- Simplifying √588 and Level 3
- 589 and Level 4
- 590 and Level 5
- 591 and a Sometimes Impossible Level 6
- 592 and The Broken Internet Connection
- 593 and Level 1
- 594 and Level 2
- 595 and Level 3
- 596 Select the Correct Top Row
- 597 and Level 5
- 598 and Level 6
- What often happens to a number like 599 when a number next to it has so many factors?
- How Many Factors Do the Numbers Up to 600 Have?
- 601 The Other Side of a Twin Prime
- 602 and Level 1
- 603 Some Consecutive Numbers and Level 2
- 604 and Level 3
- 605 and Level 4
- 606 and Level 5
- 607 and Level 6
- 608 and Level 1
- 609 and Level 2
- 610 and Level 3
- 611 and Level 4
- 612 and Level 5
- I can tell that 613 is a prime number just by looking at it!
- 614 and Level 6
- 615 and Level 1
- 616 and Level 2
- 617 Do You See a Pattern?
- 618 and Level 3
- 619 and Level 4
- 620 and Level 5
- 621 and Level 6
- 622 and Level 1
- 623 and Level 2
- 624 and Level 3
- 625 Where did all those Pythagorean triples come from?
- 626 Semordnilaps, Palindromes and Level 4
- 627 and Level 5
- 628, Tau, Pi, and Level 6
- 629 and Level 1
- 630 Factor Trees and Level 2
- 631 and Level 3
- 632 and Level 4
- 633 and Level 5
- 634 and Level 6
- 635 Some Multiplication Facts to Know Backwards and Forwards
- 636 and Level 1
- 637 and Level 2
- 638 and Level 3
- 639 and Level 4
- 640 Fall Factor Trees and Level 5
- 641 and Level 6
- 642 Was This Venn Diagram Made Correctly?
- 643 and Level 1
- 644 Divisibility Rules and Level 2
- 645 Four Consecutive Odd Numbers Pass a Prime Number Test
- 646 and Level 3
- 647 and Level 4
- 648 and Level 5
- 649 and Level 6
- 650 is the sum of all the clues in this Level 1 puzzle
- 651 and Level 2
- 652 and Level 3
- 653 and Level 4
- 654 and Level 5
- 655 and Level 6
- 656 Halloween Tangram Puzzle Cats
- 657 and Level 1
- 658 How Many Triangles Point Up? How Many Triangles Point Down? How Many Triangles in All?
- 659 Jack O’lantern Puzzle
- 660 My Two-Year Blogiversary
- 661 Candy Corn
- 662 More Candy Corn
- 663 Peanut Butter Kiss Puzzle
- 664 The Back of a Halloween Cat’s Head
- 665 and Level 1
- 666 The Devil’s Triangular Number
- 667 and Level 2
- 668 and Level 3
- 669 and Level 4
- 670 and Level 5
- 671 is the Magic Sum of an 11 x 11 Magic Square
- 672 Is it too soon to pick out a tree?
- 673 and Level 6
- 674 and Level 1
- 675 and Level 2
- 676 and Level 3
- 677 and Level 4
- 678 and Level 5
- 679 and Level 6
- 680 What Would Happen If Ten-Frames Looked Like This?
- 681 is a factor of the first 681 composite numbers added together
- 682 Deserves a Lot of Exclamation Points!!!
- 683 is the 4th Wagstaff Prime
- Consecutive Numbers That Add up to 684
- 685 Is the Sum of Two Squares Two Different Ways
- 686 and Level 5
- 687 and Level 6
- 688 is a Friedman number
- What Makes 689 Amazing?
- When is 690 a Palindrome? In Base 16 and Base 29.
- 691 and Level 3
- 692 Happy Thanksgiving!
- Divisibility Tricks Applied to 693
- 694 and Level 6
- 695 and Level 1
- 696 There are lots of goodies in this Christmas Stocking
- 697 and Level 3
- 698 The week a single post went viral in two countries
- Level 4 Christmas Puzzle #699
- 700 Pick Your Pony! Who will win this Amount of Factors Horse Race?
- 701 Some Virgács left by Mikulás
- 702 A Couple of Christmas Factor Trees
- What Kind of Shape is 703 in?
- 704 and Level 1
- 705 and Level 2
- 706 and Level 3
- 707 and Level 4
- 708 and Level 5
- 709 and Level 6
- 710 and Level 1
- Could 711 be Eleven 7 in base 64?
- 712 and Level 3
- 713 and Level 4
- 714 Home Runs
- 715 and Level 5
- 716 and Level 6
- 717 and Level 1
- 718 and a Christmas Star
- 719 and Level 3
- 720 Christmas Factor Trees
- 721 Merry Christmas, Everybody!
- 722 and Level 5
- 723 and Level 6
- 724 and Level 1
- 725 and Level 2
- Simplifying √726
- 727 Enjoy Some Sparkling Cider!
- 728 Number Facts and Factors of the Year 2016
- 729 What I Did for Paula Krieg’s Star Project
- 730 and Level 5
- 731 and Level 6
- 732 and Level 1
- 733 and Level 2
- There Are 10 Ways 734 is the Sum of 3 Squares
- 735 and Level 4
- 736 and Level 5
- 737 and Level 6
- 738 Warning: These 3 right triangles do NOT form one large right triangle
- 739 and Level 1
- 740 and Level 2
- 741 and Level 3
- 742 and Level 4
- 743 and Level 5
- 744 Taiwan elects its first female president!
- 745 Pythagorean Triple Puzzle
- 746 and Level 1
- 747 Happy Birthday, Steve Morris!
- 748 and Level 2
- 749 and Level 3
- 750 and Level 4
- 751 and Level 5
- 752 and Level 6
- 753 Pythagorean Triple Puzzle
- 754 and Level 1
- 755 and Level 2
- 756 and Level 3
- 757 and Level 4
- 758 and Level 5
- 759 and Level 6
- 760 Not a Misprint: One side is 84, the other 48. What are the other sides?
- 761 and Level 1
- 762 and Level 2
- 763 and Level 3
- 764 and Level 4
- Simplifiable Square Roots up to √765
- 766 and Level 6
- 767 is the hypotenuse of a Pythagorean triple, but…
- 768 and Level 1
- 769 and Level 2
- 770 and Level 3
- A regular 771-sided polygon can be constructed with a straightedge and compass.
- 772 and Level 5
- 773 and Level 6
- 774 and Level 1
- 775 and Level 2
- 776 and Level 3
- How Lucky Can 777 Be?
- 778 and Level 4
- Can You See How 779’s Factor Pairs Are Hiding in Some Pythagorean Triples?
- 780 is the 39th Triangular Number
- 781 and Level 6
- 782 and Level 1
- 783 and Level 2
- 784 and Level 3
- 785 and Level 4
- 786 and Level 5
- 787 Always a Unique Solution
- 788 and Level 1
- 789 and Level 2
- 790 and Level 3
- 791 and Level 4
- 792 Number Facts and Factors of the Year 2017
- 793 and Level 5
- 794 and Level 6
- 795 a Level 1 Puzzle with ♥
- 796 and a Valentine
- 797 and Mathematical Ways to Love
- 798 Cupid’s Arrow and Target
- 799 A Rose for Your Valentine
- 800 Which Pony Will Take Second Place?
- 801 and Level 1
- 802 Pi Day at Smith’s
- 803 From Top to Bottom
- 804 Is There a Pot of Gold at the End of This Rainbow?
- 805 and Level 4
- 806 and a Level 6 Dunce Cap?
- 807 and Level 1
- 808 Happy Birthday, Justin!
- 809 Palindromes, Factors, Whoop-de-doo
- 810 Stick and Stone
- 811 My Youngest Grandchild
- 812 How Many Triangles in All?
- 813 My Newest Grandchild
- 814 and Level 6
- 815 and Level 1
- 816 and Level 2
- 817 Tiny Squares
- 818 How Many Steps Do You Take Each Day?
- 819 How to Type eˣᵖᵒⁿᵉⁿᵗˢ in WordPress
- Numbers up to 820 with Exactly 12 Factors
- 821 Why Do Primitive Pythagorean Triples Do That?
- 822 and Level 1
- 823 and Level 2
- 824 and Level 3
- 825 Quarters Make Dividing by 25 Easy
- How to Find Consecutive Numbers That Sum to 826
- 827 and Level 5
- 828 Try Synthetic Division on These Special Polynomials
- 829 Is the 24th Centered Triangular Number
- 830 I Can Divide These Polynomials By (x – 2) Without Even Looking at Them
- 831 and Level 3
- 832 and Level 4
- 833 and Level 5
- 834 and Level 6
- 835 and Level 1
- Finding Ways to Write 836 as the Sum of Consecutive Numbers
- 837 and Level 3
- In Which Bases is 838 a Palindrome?
- 839 and Level 5
- 840 is the Smallest Number that Is the Top Number in THREE Sum-Difference Puzzles
- You’ll Be Impressed By 841’s Number Facts
- 842 and Level 6
- 843 is a Lucas Number
- Let’s revisit √844
- How Often Is 845 the Hypotenuse in a Pythagorean Triple?
- 846 and Level 2
- 847 Sending Love to My Sister in Louisianna
- 848 and Level 3
- 849 and Level 4
- How Often is 850 the Hypotenuse of a Pythagorean Triple?
- 851 Give This Apple to Your Teacher This Year
- 852 and Level 6
- 853 You Can Do This Puzzle!
- Something Cool about 854 and Its Square
- 855 A Bottle Full of Multiplication Facts
- 856 Rays of Light
- 857 Why do Primitive Pythagorean Triples Do That?
- 858 and Level 4
- What Kind of Prime Is 859?
- 860 and Level 6
- 861 Interpolating Genealogical Data
- 862 Look What a Little Bit of Spit Can Tell You!
- 863 These Primitive Pythagorean Triples Have Some Terrific Legs!
- 864 Factor Trees
- 865 and Level 1
- 866 Please Help with the September 2017 Math Education Blog Carnival!
- 867 and Level 2
- Palindrome 868 Has a Fun Square Root
- 869 and Level 3
- 870 If You Can Solve a 3×3 and a 4×4 Magic Square, Then You Can Solve a 12×12 Magic Square
- 871 Is the Smallest Number That Is the Sum of 3 Triangular Numbers 23 Different Ways
- 872 and Level 4
- 873 and Level 5
- 874 and Level 6
- 875 Multiplication and Division Facts
- 876 and Level 1
- 877 and Level 2
- 878 and Level 3
- 879 and Level 4
- 880 Flip the Diagonals!
- 881 What Level Should This Puzzle Be?
- 882 Factor Trees for the First Day of Autumn
- 883 and Level 5
- 884 Put First Things First
- 885 and Level 6
- 886 and Level 1
- 887 is the Last Prime Number for a While!
- 888 and Level 2
- 889 and Level 3
- 890 and Level 4
- 891 Mystery Level Puzzle
- 892 Tribute to The Mysteries of Harris Burdick
- A little surprise is waiting when you square 893.
- 894 and Level 5
- 895 and Level 6
- 896÷8=112. Math Teachers, It’s Carnival Time!
- 897 and Level 1
- 898 and Level 2
- 899 and Level 3
- 900 Pick Your Pony. Who’ll Win This Amount of Factors Horse Race?
- 901 and Level 4
- 902 and Level 5
- 903 Mystery Level
- 904 and Level 6
- 905 and Level 1
- 906 and Level 2
- 907 and Level 3
- 908 Haunted House
- 909 and Level 4
- 910 and Level 5
- 911 Mystery Level Puzzle
- 912 and Level 6
- 913 Haunted Ten Frame House for Ten Timid Ghosts
- 914 Jack-O’Lantern Mystery Level
- 915 Traditional Vampire Deterrent
- 916 Witch’s Hat
- 917 How to Solve for X with Candy
- 918 Grim Reaper’s Scythe
- Why Prime Number 919 is the 18th Centered Hexagonal Number
- 920 Witches’ Cauldron
- 921 Is This Bug Cute or Creepy?
- 922 Boo!
- 923 Grave Marker
- Applying Divisibility Rules to 924
- What Kind of Shape is 925 In?
- 926 Creepy Crawler
- 927 Candy Corn
- 928 Halloween Cat
- 929 Little Green Monster
- 930 Witch’s Broom
- 931 Candy Bar Mystery
- 932 and Level 1
- 933 Negative and Positive Reflections
- 934 and Level 2
- 935 Is the Second Lucas-Carmichael Number
- 936 and Level 4
- Why Is Prime Number 937 the 13th Star Number?
- 938 and Level 5
- Is There Anything Else Special about the Palindrome 939?
- 940 Mystery Level
- 941 and Level 6
- 942 and Level 1
- 943 and Level 2
- 944 and Level 3
- There’s Something Odd about the Number 945
- What Kind of Shape Is 946 In?
- 947 and Level 4
- 948 and Level 5
- 949 Mystery Level
- 950 and Level 6
- 951 is the 20th Centered Pentagonal Number
- 952 and Level 1
- 953 and Level 2
- 954 and Level 3
- 955 and Level 4
- 956 A Pentagonal Puzzle for Paula Beardell Krieg
- 957 Mystery Pentagon Puzzle
- 958 and Level 6
- 959 and Level 1
- 960 Factor Trees
- 961 is a Perfect Square in More Ways Than One
- 962 Buckle Up, Pilgrim
- 963 Arrow
- 964 Bow and Arrow
- 965 Run, Turkey, Run!
- 966 Groan! Gotta Loosen My Belt
- 967 Black Friday Shopping Advantage
- Reasons to Celebrate 968
- 969 is the 17th Tetrahedral Number and the 17th Nonagonal Number
- 970 and Level 1
- 971 and Level 2
- 972 Happy Birthday, Andy!
- 973 and Level 3
- 974 and Level 4
- 975 and Level 5
- What Kind of Shape is 976 in?
- 977 and Level 6
- 978 A Gift-Wrapped Puzzle
- 979 Was virgács in your shoes this morning?
- 980 Christmas Factor Trees
- 981 Peppermint Sticks
- 982 Red-Hot Cinnamon Candy
- 983 Candy Cane
- 984 Way Too Big Christmas Factor Tree
- 985 Make an Origami Santa Star
- 986 and Level 1
- 987 Christmas Star
- 988 Christmas Factor Tree
- 989 Christmas Bells at Eventide
- 990 Christmas Factor Trees
- 991 Carry Your Own Weather
- 992 Christmas Factor Tree
- 993 Christmas Angel
- 994 and Level 1
- 995 and Level 2
- 996 Christmas Factor Tree
- 997 and Level 3
- 998 and Level 4
- 999 and Level 5
- 1000 Find the Factors Challenge
- 1001 and Level 6
- 1002 Merry Christmas!
- 1003 and Level 2
- 1004 and Level 3
- 1005 and Level 4
- 1006 and Level 5
- 1007 and Level 6
- A Forest of 1008 Factor Trees
- 1009, a Prime Factor of the Year 2018
- 1010 Find the Factors Challenge
- 1011 A Toast to My Readers
- 1012 Do Your Brain a Favor
- 1013 Wolf Moon Mystery
- Level 2 and Simplifying √1014
- 1015 and Level 3
- 1016 and Level 4
- 1017 and Level 5
- 1018 and Level 6
- 1019 An Easier Find the Factors Challenge Puzzle
- 1020 A Week of Mystery
- 1021 Mystery Level
- 1022 Friedman Number Mystery
- Mysterious 1023
- What’s Special About √1024?
- 1025 Mystery Date
- 1026 One Last Mystery
- 1027 Find the Factors Challenge
- 1028 A Valentine Mystery
- 1029 A Rose for Your Valentine
- 1030 Cupid’s Arrow
- 1031 Prepare for World Maths Day 2018
- 1032 How Many Twelves Are in a 12×12 Times Table?
- 1033 and Level 3
- 1034 Find the Factors Challenge Puzzle
- 1035 is the 23rd Hexagonal Number
- 1036 Look, Look to the Rainbow
- 1037 and Level 1
- 1038 Hoppy Easter/April Fool’s Day
- 1039 and Level 2
- 1040 and Level 3
- 1041 and Level 4
- 1042 and Level 6
- 1043 Find the Factors Challenge Puzzle
- 1044 and Level 1
- 1045 and Level 2
- 1046 and Level 3
- 1047 and Level 4
- 1048 and Level 5
- 1049 and Level 6
- 1050 Factor Trees Are In Bloom This Spring
- 1051 is the 21st Centered Pentagonal Number
- 1052 A Mysterious Purple Cat for Josephine
- 1053 Find the Factors Challenge
- How Can You Count These 1054 Tiny Squares?
- 1055 and Level 1
- 1056 How to Tile a 32 × 33 Floor
- 1057 and Level 2
- 1058 and Level 3
- 1059 and Level 4
- 1060 A Challenge for Justin’s Birthday
- 1061 and Level 5
- 1062 Complicated Logic
- 1063 and Level 1
- 1064 and Level 2
- 1065 and Level 3
- 1066 and Level 4
- 1067 and Level 5
- 1068 and Level 6
- 1069 Mystery Level Puzzle
- 1070 A Complicated Logic Mystery
- 1071 What I Bought at the School Book Fair
- 1072 Find the Factors Challenge
- 1073 and Level 1
- 1074 and Level 2
- 1075 and Level 3
- 1076 and Level 4
- 1077 and Level 5
- 1078 and Level 6
- 1079 An Easier Find The Factors Challenge?
- STOP! Look How Cool a Number 1080 Is!
- 1081 and Level 1
- 1082 and Level 3
- 1083 and Level 3
- 1084 and Level 4
- 1085 and Level 5
- 1086 and Level 6
- 1087 and Level 3
- 1088 and Level 2
- 1089 Perfect Squares
- 1090 and Level 4
- 1091 and Level 5
- 1092 Predictable Factor Trees
- 1093 is a STAR!
- 1094 and Level 6
- 1095 and Level 1
- 1096 and Level 2
- 1097 and Level 3
- 1098 a Lucky Level 4 Puzzle?
- 1099 and Level 5
- 1100 Now THIS Is a Horse Race!
- 1101 and Level 6
- 1102 and Level 1
- 1103 and Level 2
- 1104 and Level 3
- Mathemagical Properties of 1105
- 1106 and Level 4
- 1107 and Level 5
- 1108 and Level 6
- 1109 Mystery Level
- 1110 Another Mystery
- 1111 and Level 1
- 1112 The Children of Betkó Mátyás
- 1113 and Level 2
- 1114 My Rant about the State’s Emissions Test
- 1115 and Level 3
- 1116 Can I Trick You With This Puzzle?
- 1117 and Level 5
- 1118 and Level 6
- 1119 Mystery
- 1120 There’s Lots of Shade under These Factor Trees!
- 1121 and Level 1
- 1122 Factor Trees
- 1123 and Level 2
- 1124 and Level 3
- 1125 May I Interest You In a Little Cake?
- 1126 and Level 4
- 1127 and Level 5
- 1128 is the 24th Hexagonal Number
- 1129 is the Last Prime Number for a While!
- 1130 and Level 6
- 1131 Mystery
- 1132 Mystery
- 1133 A Challenge Puzzle
- 1134 Some Likely Factor Trees
- 1135 is a Centered Triangular Number
- 1136 and Level 1
- 1137 and Level 2
- 1138 and Level 3
- 1139 and Level 4
- 1140 is the 18th Tetrahedral Number
- 1141 is a Centered Hexagonal Number
- 1142 and Level 5
- 1143 and Level 6
- 1144 Let’s Make a Factor Cake!
- 1145 Mysterious Butterfly
- 1146 Mystery Level
- 1147 Dragonfly Challenge
- 1148 and Level 1
- 1149 and Level 2
- 1150 Perfectly Symmetrical Factor Trees
- 1151 and Level 3
- 1152 Will You See All the Prime Factors in This Factor Tree?
- 1153 Level 4 Pair of Glasses
- 1154 and Level 5
- Reasons to Celebrate 1155
- What Kind of Shape is 1156 In?
- 1157 and Level 6
- 1158 Mystery Level
- 1159 Mystery Level
- 1160 Find the Factors Challenge
- 1161 and Level 1
- 1162 Is a Pentagonal Number
- 1163 and Level 2
- 1164 Mathematics at Corvin Castle
- 1165 and Level 3
- 1166 and Level 4
- 1167 and Level 5
- 1168 Sosto Museum Village School Room
- 1169 and Level 6
- 1170 Factor Trees
- 1171 The Best Team in the Best Conference
- 1172 Mystery Puzzle
- 1173 Challenge Puzzle
- 1174 and Level 1
- 1175 and Level 2
- How to Simplify √1176
- 1177 and Level 3
- 1178 School Supplies
- 1179 and Level 4
- 1180 How Are They the Same? How Are They Different?
- 1181 and Level 5
- 1182 A Unique Solution
- 1183 is the 13th Pentagonal Pyramidal Number
- 1184 Mystery Level
- 1185 Mystery Level
- 1186 Challenge Puzzle
- 1187 and Level 1
- 1188 How Many Triangles? How Many Factors?
- 1189 and Level 2
- 1190 and Level 3
- 1191 Happy Birthday, Brent
- 1192 Experiential Learning Helps Students Understand Their Capacity
- 1193 Math Carnival Games
- 1194 and Level 4
- 1195 You Can Find the Answer in This Book
- 1196 and Level 6
- 1197 Mystery Level
- 1198 Challenge Puzzle
- 1199 and Level 1
- 1200 The 120th Playful Math Carnival
- The factors of the hundred numbers just before 1201
- 1202 and Level 2
- 1203 and Level 3
- 1204 and Level 4
- 1205 and Level 5
- 1206 and Level 6
- 1207 The Risks of Tearing Down Walls
- 1208 Mystery Level
- 1209 Mystery Level
- 1210 Challenge Puzzle
- 1211 and Level 1
- 1212 and Level 2
- 1213 and Level 3
- 1214 and Level 4
- 1215 and Level 5
- 1216 and Level 6
- 1217 Squeegee Mystery
- 1218 Mystery Level
- 1219 is a Centered Triangular Number
- 1220 Challenge Puzzle
- 1221 and Level 1
- 1222 and Level 2
- 1223 and Level 3
- How I Knew Immediately that a Factor Pair of 1224 is . . .
- 1225 is a Triangular Number, a Perfect Square, and . . .
- 1226 Happy Birthday to My Sister, Sue
- 1227 and Level 4
- 1228 and Level 5
- 1229 and Level 6
- 1230 Mystery
- 1231 Mystery Level Puzzle
- 1232 Factor Cake
- 1233 and Level 1
- 1234 and Level 2
- 1235 and Level 3
- 1236 and Level 4
- 1237 and Level 5
- 1238 and Level 6
- 1239 Addition and Subtraction Families
- 1240 is a Square Pyramidal Number
- 1241 Mystery Level
- 1242 is a Decagonal Number
- 1243 and Level 1
- 1244 and Level 2
- 1245 and Level 3
- 1246 and Level 4
- 1247 Is a Pentagonal Number
- 1248 Factor Trees
- 1249 and Level 5
- 1250 and Level 6
- 1251 and Level 1
- 1252 What Do You Notice?
- 1253 and Level 2
- 1254 and Level 3
- 1255 and Level 4
- 1256 and Level 5
- 1257 and Level 6
- 1258 Mystery Level
- 1259 Graveyard Marker
- Haunted Forest with 1260 Factor Trees
- 1261 Can You Make a Star out of a Hexagon?
- 1262 Jack-o-lantern Mystery
- 1263 Candy Corn Mystery
- 1264 Dum Dums Mystery
- 1265 More Candy Corn
- 1266 is a Centered Pentagonal Number
- 1267 Frankenstein Mystery
- 1268 Halloween Cat Mystery
- 1269 Tangram Witch Puzzle
- 1270 What’s Brewing on My 5-Year Blogiversary
- 1271 and Level 1
- 1272 and Level 2
- 1273 and Level 3
- 1274 Imagining With Sain Smart Jr.’s Tetris Puzzle
- 1275 is the 50th Triangular Number AND the 500th Number Whose Square Root Can Be Simplified
- 1276 is the Third Number in a Row with Exactly 12 Factors
- 1277 Strată Bolyai János in Timișoara, Romania
- 1278 and Level 4
- 1279 and Level 5
- 1280 and Level 6
- 1281 and Level 1
- 1282 and Level 2
- 1283 and Level 3
- 1284 and level 4
- 1285 and Level 5
- 1286 and Level 6
- 1287 Mystery Level
- 1288 Mystery Puzzle
- 1289 and Level 1
- 1290 Multiplication Boomerang
- 1291 and Level 3
- 1292 and Level 4
- 1293 and Level 5
- 1294 and Level 6
- 1295 Mystery Level
- 1296 Last Digit Effort
- 1297 Mystery
- 1298 Another Mystery
- 1299 Is This Puzzle a Real Turkey?
- 1300 Prime Factorization for These Hundred Numbers
- 1301 Cool Patterns of Centered Square Numbers
- 1302 and Level 1
- 1303 and Level 2
- 1304 and Level 3
- 1305 and Level 4
- 1306 is a Centered Triangular Number
- 1307 and Level 5
- 1308 and Level 6
- 1309 Mystery Level
- 1310 Happy Birthday to My Brother, Andy
- 1311 Little Square Candies
- 1312 Fill This Boot with Candy
- 1313 Virgács and St. Nickolas Day
- 1314 Desmos Art
- 1315 Peppermint Stick
- 1316 Hard Candy
- 1317 Candy Cane
- 1318 Another Candy Cane
- 1319 Challenge Puzzle
- 1320 Christmas Factor Trees
- 1321 Christmas Gift Puzzle
- 1322 Christmas Star
- 1323 Christmas Tree
- 1324 Gingerbread Man
- 1325 Hockey Stick
- The Shape of 1326
- 1327 Record-Breaking Prime Gap
- 1328 Christmas Tree
- 1329 Flight Plans
- 1330 is the 19th tetrahedral Number
- What 1331 in Pascal’s Triangle Means
- 1332 Yet Another Christmas Tree
- 1333 and Level 1
- 1334 and Level 2
- 1335 is a Pentagonal Number
- 1336 and Level 3
- 1337 and Level 4
- 1338 and Level 5
- 1339 Written Eligible Factor Pairs Can Reveal the Needed Logic
- 1340 Mystery Level
- 1341 Not a Pretty Picture
- Facts about and Factors of 2019
- 1342 Level One Puzzles Only
- 1343 Level TWO Puzzles Only
- How Far Away Is 1344 from the Nearest Prime Number?
- 1345 Level Three Puzzles Only
- (1346÷2)×3 = 2019 Magic or Square?
- 1347 and Level 1
- 1348 Coloring Paula Krieg’s Polar Rose
- 1349 A Rejected Puzzle
- 1350 Logic is at the Heart of This Puzzle
- 1351 and a Level 2 Smiley Face
- 1352 and Level 3
- 1353 How to Solve a Level 4 Puzzle
- 1354 Solving a Level 5 Puzzle
- 1355 I Can Solve This Puzzle, Can You?
- 1356 Mystery
- 1357 and Level 1
- 1358 and Level 2
- 1359 and Level 3
- 1360 and Level 4
- 1361 and Level 5
- What Is Special about √1362
- 1363 and Level 6
- 1364 is the 15th Lucas Number
- 1365 Shamrock Mystery
- 1366 Fractions Acting Improperly
- Finding Primes Like 1367
- 1368 Playing with the Sieve of Eratosthenes
- An Efficient Way to Quickly Find All the Odd Prime Numbers Less Than 1369
- 1370 Detail Left Out of the History Books
- 1371 Today is a Good Day to Review Proof by Induction
- 1372 Yahtzee How-Many-Rolls Variation
- 1373 and Level 1
- 1374 and Level 2
- The Cube Root of 1375 is the Smallest. . .
- 1376 Let’s Get Ready for the Playful Math Carnival!
- 1377 Easter Basket Challenge
- 1378 and Level 3
- 127th Playful Math Education Blog Carnival
- 1379 You Can Solve This Magic Square
- 1380 A Different Way to Look at the Logic
- 1381 Hooda Math’s Multiplication Game
- 1382 and Level 4
- 1383 and Level 5
- 1384 and Level 6
- 1385 Mystery Level
- 1386 What You Need to Know About the Multiplication Game
- The Shape of 1387 Tiny Squares
- 1388 Mystery Level
- 1389 Positive Trinomial Puzzle
- 1390 Find the Factors (ax±b)(cx±d)
- 1391 and Level 1
- 1392 and Pythagorean Triples
- DNA and Big Brother
- 1393 DNA Shared Matches
- 1394 and Level 2
- 1395 and Level 2
- 31 Flavors of 1396
- 1397 and Level 4
- 1398 and Level 5
- 1399 and Level 6
- Prime Factorization of the Hundred Numbers up to 1400
- 1401 Roasting Over an Open Fire
- 1402 Mystery Level
- 1403 Multiplication Table Challenge
- 1404 Texas Tessellation
- 1405 is the Sum of Squares
- 1406 Has a Very Cool 4th Root
- 1407 Please Stop Making Excuses for My Dear Aunt Sally
- 1408 Powers of 2 in the Multiplication Table
- 1409’s Super Power
- 1410 and Level 1
- 1411 and Level 2
- 1412 and Level 3
- 1413 and Level 4
- DNA Evidence at Ellis Island
- 1414 Your Math Education Post Will Add So Much to This Month’s Carnival!
- 1415 and Level 6
- 131 Playful Math Carnival
- 1416 A Birthday Mystery
- 1417 Mystery Puzzle
- 1418 Challenge Puzzle
- 1419 and Level 1
- 1420 Eight-legged Creature
- 1421 Square-shaped Sweet
- 1422 Candy Corn Mystery
- 1423 Lollipop
- 1424 Logic and Fear
- 1425 Jack O’Lantern
- How Are These Two DNA Shared Matches Related to Each Other?
- 1426 is a Pentagonal Number
- 1427 Mysterious Cat
- 1428 Factor Trees in Autumn
- 1429 Find the Factors Challenge
- 1430 Is a Catalan Number
- 1431 is a Triangular Number and a Hexagonal Number
- 1432 and Level 1
- 1433 and Level 2
- 1434 and Level 3
- 1435 is the 23rd Friedman Number
- 1436 This Turkey Is Ready
- 1437 Belt Buckle Mystery
- 1438 and Level 5
- 1439 and Level 6
- Taking the Mystery out of 1440
- Why is 1441 a Star?
- 1442 A Birthday Present for My Brother, Andy
- 1443 A Simple Gift for You
- 1444 Christmas Wrapping Paper
- 1445 Virgács for Your Boots Tonight
- 1446 Peppermint Stick
- 1447 Christmas Light Puzzle
- 1448 Christmas Factor Tree
- 1449 Christmas Star
- 1450 A Pair of Factor Trees
- 1451 Star of Wonder
- 1452 Poinsettia Plant Mystery
- Let’s Make a Factor Cake for 2020
- Countdown to 2020
- 1453 Happy Birthday, Jo Morgan
- 1454 Happy Valentines’ Day
- 135th Playful Math Education Blog Carnival
- 1455 and Level 1
- 1456 and Level 2
- 1457 and Level 3
- 1458 Tangrams Can Be A Pot of Gold
- 1459 and Level 4
- 1460 and Level 5
- 1461 and Level 6
- 1462 Has a Palindromic Factor Pair
- 1463 When to Use the Law of Sines and the Law of Cosines
- 1464 Alibis and a Mystery
- 1465 A Degrees to and from Radians Calculator
- 1466 A Non-Simplified Yet Easy-to-Remember Unit Circle
- 1467 Challenge Puzzle
- 1468 and Level 1
- 1469 and Level 2
- 1470 Can You Find Factor Pairs That Make Sum-Difference?
- 1471 and Level 3
- 1472 and Level 4
- 1473 A Level 5 Designed by My Granddaughter
- 1474 and Level 6
- 1475 The Logic Needed to Solve This Mystery
- 1476 Mystery
- 1477 Challenge
- 1478 and Level 1
- 1479 and Level 2
- 1480 and Level 3
- 1481 is the First Prime Number in the Fifth Prime Decade
- 1482 and Level 4
- 1483 and Level 5
- 1484 A Popsicle for a Hot Summer Day
- 1485 Sticky Lollipop Mystery
- 1486 Mysterious Cat
- 1487 A Challenging Puzzle
- 1488 Chalk Art
- 1489 and Level 1
- 1490 and Level 2
- 1491 How Many Square Units Do You See in This Partially Completed Puzzle?
- 1492 The Niña, the Pinta, and the Santa Maria
- 1493 and Level 4
- 1494 and Level 5
- 1495 and Level 6
- 1496 is a Square Pyramidal Number
- 1497 Mystery
- 1498 Another Mystery
- 1499 Challenge Puzzle
- Celebrating 1500 with a Horse Race and Much More!
- 1501 is a Centered Pentagonal Number
- 1502 and Level 1
- Why is 1503 a Friedman Number?
- 1504 and Level 3
- 1505 and Level 4
- 1506 and Level 5
- 1507 and Level 6
- 1508 Hosting a Playful Math Carnival and Flying by the Seat of My Pants
- 1509 A Mystery Level Puzzle on Training Wheels
- 1510 Challenge Puzzle
- Welcome to the 140th Playful Math Education Blog Carnival!
- 1511 and Level 1
- 1512 Bigger Bites of Cake
- 1513 is the Sum of Squares
- 1514 and Level 2
- 1515 and Level 3
- 1516 and Level 4
- 1517 and Level 5
- 1518 and Level 6
- What Kind of Shape is 1519 in?
- What Kind of Shape is 1520 in?
- What Kind of Shape Is 1521 in?
- 1522 Happy Birthday, Sue, in Spite of All the Chaos!
- 1523 Mystery Puzzle
- 1524 Mystery
- 1525 Challenge Puzzle
- 1526 Grave Marker
- 1527 Not a Haunted House
- 1528 Candy Corn
- 1529 Pointy Hat
- 1530 Jack-o’-lantern
- 1531 Spider’s Web or Not?
- 1532 Don’t Let This Puzzle Spook You!
- 1533 Double Double Toil and Trouble
- 1534 Dem Bones
- 1535 Your Favorite Candy Bar
- Factors of 1536 Make Sum-Difference!
- 1537 First Letter of a Secret Message
- 1538 Second Letter of My Message
- 1539 Mystery Puzzle for a Mystery Message
- How Much of My $1540 Will The Taxman Get?
- 1541 is the 23rd Octagonal Number
- 1542 Fourth Letter of the Message
- 1543 Another Letter
- 1544 Final Letter of the Message
- 1545 The Complete Message Made with Puzzle Letters
- 1546 Celebrating My 7th Blogiversary
- 1547 is a Hexagonal Pyramidal Number
- 1548 Puzzling Gerrymandering Questions
- 1549 and Level 2
- 1550 Lucky for You: Solving This Puzzle Is as Easy as Climbing Down a Ladder
- 1551 Two Straight Lines
- 1552 Look for Clues around the Corner
- 1553 Ornamental Corn
- 1554 What Patterns Do You See?
- 1555 Two Turkeys Too Tough To Try?
- 1556 Stacks Up Nicely!
- 1557 Happy Birthday to My Brother, Andy!
- 1558 The Reason for the Season
- 1559 We Need a Little Christmas Now
- Why Do Factor Pairs of 1560 Make Sum-Difference?
- 1561 Virgács for Boots and Stockings
- 1562 Evergreen Tree
- 1563 The Holly Wreath
- 1564 Two Candles
- 1565 Stable with Manger
- 1566 How to Make a Magic Square Snowflake
- 1567 Peppermint Stick
- 1568 A Challenging Christmas Tree
- 1569 A Magic Hexagon Puzzle
- 1570 How to Solve the Dollar Tree Ball Puzzle
- 1571 Candy Cane
- 1572 Twelve Orientations of a Magic Snowflake
- Factors and Facts for the Year 2021
- 1573 Ring Out Wild Bells
- 1574 Avoiding Fractions When Using the Substitution Method to Solve Simultaneous Equations
- Sharing $15.75 Worth of Puzzles
- 1576 Why Do the Digits of Every Clue in This Puzzle Add up to Nine? (Level 1)
- 1577 Crossing a Bridge (Level 2)
- 1578 The Logic Needed to Solve This Puzzle is Straight Forward (Level 3)
- 1579 It’s Inauguration Day! (Mystery Level)
- 1580 Use Logic to Solve This Puzzle (Level 4)
- 1581 One Teardrop among Millions (Level 5)
- 1582 Half the Time You’ll Be Thinking about Multiples instead of Factors (Level 6)
- 1583 The Logic for This Mystery Level Puzzle
- 1584 You Will L♥ve This Challenge Puzzle!
- 1585 is a Centered Triangular Number
- 1586 and a Level One Puzzle
- 1587 XOXOXO Hugs and Kisses OXOXOX (Level 2)
- 1588 Cupid’s Arrow (Level 3)
- 1589 Candy Bars
- 1590 A Single Rose
- 1591 Conversation Heart
- 1592 One More Valentine
- Sorting the Factors of 1593
- 1594 and Level 1
- 1595 and Level 2
- How Much of My $1596 Will the Taxman Get?
- 1597 and Level 3
- 1598 See the Logic in This Level 4 Puzzle
- 1599 and Level 5
- 1600 How Would You Describe This Horse Race?
- 1601 and Level 6
- 1602 Mystery
- 1603 Challenge Puzzle
- 1604 and a Big Level One
- 1605 and Another Big Level One
- 1606 A Lucky Shamrock
- 1607 Shillelagh
- 1608 Rainbow
- 1609 Pot of Gold
- 1610 Four-Leaf Clovers
- 1611 A Little Blarney?
- 1612 Celtic Knot
- 1613 Comparing π and √10
- 1614 and Level 1
- 1615 Should Today Be Root Ten Day?
- 1616 Centering the Pendulum
- 1617 is a Pentagonal Number
- 1618 Math Happens in the Austin Chronicle
- 1619 A Pink Egg Hidden in the Grass
- Math Happens When Factors of 1620 Make Sum-Difference
- 1621 Give This Purple Egg a Crack!
- 1622 A Blue Egg for Your Easter Basket
- 1623 Easter Basket Challenge Puzzle
- 1624 Applying Twelve Divisibility Rules to Permutations of 1234567890
- 1625 is a Centered Square Number
- 1626 is a Centered Pentagonal Number
- 1627 Color-Coded Prime Numbers
- 1628 A Simple Cross
- 1629 and Level 2
- 1630 and Level 3
- 1631 The Importance of Practice
- Math Happens When Two of 1632’s Factors Look in a Mirror!
- 1633 and Level 5
- 1634 Be Prepared for April Showers
- 1635 The Logic to This Puzzle Is a Real Mystery
- The 146th Playful Math Education Blog Carnival
- 1636 A Tricky Mystery Puzzle
- 1637 Flower Challenge
- 1638 Factors and Multiples
- 1639 and Level 1
- 1640 A Level 2 Flower
- 1641 and Level 3
- 1642 and Level 4
- 1643 Thrift Store Find
- 1644 Level 5 Puzzles Are Not So Easy to Solve
- 1645 and Level 6
- 1646 Mystery Level
- 1647 A Fun Mystery
- 1648 A Pythagorean Triple Logic Puzzle with a Triangular Card Deck
- Yes, YOU Can Host a Playful Math Education Blog Carnival
- 1649 Tweaking a Puzzle Posed by Sunil Singh @Mathgarden
- 1650 Wrinkles in the Multiplication Table
- 1651 Multiplication Fun
- 1652 Start at the Top and Work Your Way Down to the Bottom
- $1653, Fake Primes, and Taxman’s “Rigged” Counting
- 1654 and Level 4
- 1655 and Level 5
- 1656 Seven Ate Nine: Puzzle and a Picture Book
- Prime Number 1657 is the 24th Centered Hexagonal Number
- 1658 Mystery Puzzle
- 1659 Another Mystery
- 1660 A 14×14 Mystery Puzzle
- 1661 A Little About Palindromes
- 1662 Declare Your Independence!
- 1663 and Level 1
- 1664 and Level 2
- 1665 Why I Am Rooting for England over Denmark Today
- 1666 Demystifying a Tricky Puzzle
- 1667 and Level 4
- 1668 and Level 5
- 1669 and Level 6
- 1670 Mystery Puzzle
- 1671 Are Vaccines Really Much of a Mystery?
- 1672 A Pythagorean Triple Puzzle with Only Two Clues
- 1673 and Level 1
- 1674 and Level 2
- 1675 You CAN Solve This Level 3 Puzzle!
- 1676 Really, How Well Can You Read a Table?
- 1677 and Level 4
- 1678 and Level 5
- 1679 and Level 6
- 1680 is a Spectacular Number!
- What Is 1681’s Claim to Fame?
- 1682 This Puzzle Is Not as Difficult as It Looks
- 1683 Grave Marker
- 1684 Triangular Candy Corn
- 1685 Oh, No! I’ve Created a Monster!
- 1686 Some Candy Corn for You to Chew on
- 1687 Fly Me to the Moon!
- 1688 What Can Grow from a Little Seed?
- 1689 Candy Corn Again?!
- 1690 Today Is My 8th Blogiversary!
- 1691 Jack 0’Lantern Time
- Do These Records Refer to One Person, Two People, or More?
- 1692 A Pilgrim’s Belt to Unbuckle
- 1693 Tricky Turkey
- 1694 Football Game Day
- 1695 If You Can Solve 3×3 and 5×5 Magic Squares, Then You Can Solve a 15×15 Magic Square!
- 1696 Inverses
- 1697 A Boot in the Window
- 1698 A Little Virgács and Candy
- 1699 Sweet Candy Cane
- 1700 Time for a Horse Race!
- 1701 Is a Decagonal Number
- 1702 A Puzzle Idea from @mathequalslove Tweaked into a Subtraction Puzzle That Directs You to a Post from NebusResearch
- 1703 A Wreath to Hang on Your Door
- 1704 Christmas Factor Tree
- 1705 The Seat Numbers from Jimmy Fallon’s Twelve Days of Christmas Sweaters
- 2022 Facts and Factors
- 1706 Can You Make the Factors Fit?
- 1707 Subtraction Distraction
- 1708 Happy Birthday, Jo Morgan!
- 1709 Sometimes “Guess and Check” Is a Good Strategy
- Find the Factor Pairs of 1710. Which One Sums to 181? Which One Subtracts to 181?
- 1711 is a Triangular Number So The Taxman Wants His Share
- 1712 Can You Make the Factors Fit?
- 1713 A Little More of a Subtraction Distraction
- 1714 Will the Factors in This Puzzle Give You Fits?
- 1715 A Lot More of a Subtraction Distraction
- Two Factor Pairs of 1716 Make Sum-Difference!
- 1717 Factor Fits for Your Valentine
- 1718 Factor Fits Valentine
- The 153rd Playful Math Education Blog Carnival!
- 1719 A Meaningful Statistics Project
- 1720 Transforming Puzzle-A-Day’s Wizard’s Hat
- 1721 A Gift With Multiple Treasures
- 1722 Mikulás, Fill My Boot With Goodies!
- 1723 A Little Virgács
- 1724 Carol of the Ukrainian Bells
- Facts, Factors, and a Countdown to 2023
- 1725 A Toast to You on This Last Day of the Year
- 1726 Find the Factors 1-12 AND 13-24
- 1727 A Happy Birthday Cake for Jo Morgan
- 1728 Is a Perfect Cube
- 1729 Not a Dull Number
- How Is 1730 the Sum of Consecutive Squares?
- 1731: The Sum of the Squares of Three Consecutive Prime Numbers
- 1732 Is a Thousand Times More Than…
- 1733 and Its Prime Number Substrings
- Both17 and 34 are Factors of 1734 and Help It Make Sum-Difference
- 1735 What Amazing Mathematical Pattern I Noticed Today!
- 1736 Fun With Magic Squares
- 1737 What Logic Will You Use to Solve This Puzzle?
- 1738 Little Surprises Around Every Turn
- 1739 A Gift for a Valentine
- 1740 I Think You’re Going to L♥ve This Multiplication Puzzle
- 1741 What Do You Notice About the Remainders?
- 1742 Just How Sharp Do You Think Cupid’s Arrow Is?
- 1743 Finding Ways to Transform My Heart
- 1744 XOXO Kisses or Multiplication? XOXO
- 1745 How Thorny Is This Rose?
- 1746 Love-Struck with Multiplication
- 1747 Getting a Super Bowl Ring Isn’t Easy
- 1748 A Factor Fits Valentine’s Puzzle
- 1749 Happy Valentine’s Day!
- 1750 and Level 1
- 1751 A Pythagorean Triple Puzzle