1073 and Level 1

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You might not recognize it, but this puzzle is just a multiplication table. The factors in the table are all missing, and they aren’t in their usual places, but you have everything you need here to find the factors from 1 to 10 and then complete the entire multiplication table. It’s a level 1 puzzle so I am absolutely sure you can solve it!

Print the puzzles or type the solution in this excel file: 10-factors-1073-1079

Here is a little information about the number 1073:

  • 1073 is a composite number.
  • Prime factorization: 1073 = 29 × 37
  • The exponents in the prime factorization are 1 and 1. Adding one to each and multiplying we get (1 + 1)(1 + 1) = 2 × 2 = 4. Therefore 1073 has exactly 4 factors.
  • Factors of 1073: 1, 29, 37, 1073
  • Factor pairs: 1073 = 1 × 1073 or 29 × 37
  • 1073 has no square factors that allow its square root to be simplified. √1073 ≈ 32.75668

32² + 7² = 1073
28² + 17² = 1073

Because 29 × 37 = 1073, it is the hypotenuse of FOUR Pythagorean triples, two of which are primitives:
348-1015-1073 which is 29 times (12-35-37)
740-777-1073 which is (20-21-29) times 37
448-975-1073 calculated from 2(32)(7), 32² – 7², 32² + 7²
495-952-1073 calculated from 28² – 17², 2(28)(17), 28² + 17²

1073 looks interesting when it is written in some other bases:
It’s 4545 in BASE 6 because 4(6³) + 5(6²) + 4(6) + 5(1) = 1073,
292 in BASE 21 because 2(21²) + 9(21) + 2(1) = 1073, and
TT in BASE 36 (T is 29 base 10) because 29(36) + 29(1) = 29(37) = 1073

1072 Find the Factors Challenge

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These Find the Factors Challenge puzzles are tougher than my other puzzles, but they can still be solved using logic and basic multiplication and division facts. Go ahead, give it a try! I sincerely hope you will succeed!

Print the puzzles or type the solution in this excel file: 12 factors 1063-1072

Now I’ll share some facts about the number 1072:

  • 1072 is a composite number.
  • Prime factorization: 1072 = 2 × 2 × 2 × 2 × 67, which can be written 1072 = 2⁴ × 67
  • The exponents in the prime factorization are 4 and 1. Adding one to each and multiplying we get (4 + 1)(1 + 1) = 5 × 2 = 10. Therefore 1072 has exactly 10 factors.
  • Factors of 1072: 1, 2, 4, 8, 16, 67, 134, 268, 536, 1072
  • Factor pairs: 1072 = 1 × 1072, 2 × 536, 4 × 268, 8 × 134, or 16 × 67
  • Taking the factor pair with the largest square number factor, we get √1072 = (√16)(√67) = 4√67 ≈ 32.74141

1072 is also palindrome 646 in BASE 13 because 6(13²) + 4(13) + 6(1) = 1072

1071 What I Bought at the School Book Fair

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Our elementary school recently had a book fair. I purchased three books, and I’d like to tell you a little bit about each of them.

Optical Illusions by Gianni A. Sarcone and Marie-Jo Waeber will make a nice addition to my other books on optical illusions. This one is special not only because it has a moveable design on the front cover, but also because it includes instructions on how kids or adults can make their own optical illusions. Mathematics and art often both play a part when an optical illusion is created. There is so much information in this book that I haven’t read it completely yet, but I like what I’ve read so far.

When Sophie Thinks She Can’t by Molly Bang brings up several subjects including math anxiety, bullying, and growth mindset. It also introduces tangram puzzles and making rectangles from 12 squares. Anytime you feel inclined to say, “I can’t!” add the very important word, “yet.” I like this book a lot and read it to a class of 5th graders right before I introduced them to the Find the Factors puzzles. (As I handed out the puzzles, one student with a sense of humor called out, “I can’t do these puzzles.” I smiled and said, “That was a good one,” and then proceeded to make sure every kid in the class could at least do the first few levels of the puzzle.)

All Year Round by Susan B. Katz with cute pictures by Eiko Ojala. This book uses appealing rhymes to intertwine two important early mathematical concepts: the calendar and simple geometric shapes. Some of the shapes even introduce concepts in solid geometry.

At first, I didn’t buy this book because a few things disappointed me:

  1.  It seems to imply that flowers with four round petals are shaped like a square. (The flowers are in a square box, but the focus in on the flowers, not the box.)
  2. Baseball diamonds are actually squares. Turning it on its corner does not change it from a square to a diamond, or rhombus, as it is called in mathematics. (I decided to forgive this because every square is technically a rhombus even though not every rhombus is a square. And besides, a baseball playing field really is called a baseball diamond.)
  3. Unless you cut off the rounded top of a slice of pumpkin pie, you won’t really have a triangle shape; you will have a sector. Yes, sectors look a lot like triangles, but they are not triangles.

However, after going home and thinking about it, I decided that these complaints can be good conversation starters so I went back to the book fair and bought the book. Besides, commonly-used shape names do not necessarily match correct geometric terms. I have read this book to one of my granddaughters, and we enjoyed reading and seeing how the world changes over a calendar year and identifying the simple shapes in the illustrations.

Since this is my 1071st post, I’ll share some facts about the number 1071:

  • 1071 is a composite number.
  • Prime factorization: 1071 = 3 × 3 × 7 × 17, which can be written 1071 = 3² × 7 × 17
  • The exponents in the prime factorization are 2, 1, and 1. Adding one to each and multiplying we get (2 + 1)(1 + 1)(1 + 1) = 3 × 2 × 2 = 12. Therefore 1071 has exactly 12 factors.
  • Factors of 1071: 1, 3, 7, 9, 17, 21, 51, 63, 119, 153, 357, 1071
  • Factor pairs: 1071 = 1 × 1071, 3 × 357, 7 × 153, 9 × 119, 17 × 63, or 21 × 51,
  • Taking the factor pair with the largest square number factor, we get √1071 = (√9)(√119) = 3√119 ≈ 32.72614

1071 is the hypotenuse of a Pythagorean triple:
504-945-1071 which is (8-15-17) times 63

OEIS.org informs us that 6³ + 7³ + 8³ = 1071, making 1071 the sum of three consecutive cubes.

1071 is consecutive digits 567 in BASE 14 because 5(14²) + 6(14) + 7(1) = 1071

1070 A Complicated Logic Mystery

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This mystery level puzzle requires complicated logic just to get started. If you get stuck, ask yourself these questions:
What two clues must use both 5’s?
What two clues must, therefore, use both 6’s?
What do you know about clue 36 because it shares a common factor with 24?
What two clues must use both 3’s?
What do you now know about the common factor of clues 8 and 24?
What do you also now know about the common factor of clues 36 and 24?

Print the puzzles or type the solution in this excel file: 12 factors 1063-1072

Here is a little information about the number 1070:

  • 1070 is a composite number.
  • Prime factorization: 1070 = 2 × 5 × 107
  • The exponents in the prime factorization are 1, 1, and 1. Adding one to each and multiplying we get (1 + 1)(1 + 1)(1 + 1) = 2 × 2 × 2 = 8. Therefore 1070 has exactly 8 factors.
  • Factors of 1070: 1, 2, 5, 10, 107, 214, 535, 1070
  • Factor pairs: 1070 = 1 × 1070, 2 × 535, 5 × 214, or 10 × 107
  • 1070 has no square factors that allow its square root to be simplified. √1070 ≈ 32.71085

1070 is the hypotenuse of a Pythagorean triple:
642-856-1070 which is (3-4-5) times 214

 

1069 Mystery Level Puzzle

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It isn’t a mystery where the 7’s and the 11’s go in this puzzle, but then what are you going to do? That’s the mystery. Can you write each number from 1 to 12 in both the first column and the top row so that those numbers are the factors of the given clues? There are plenty of places to be tricked in this puzzle, so good luck!

Print the puzzles or type the solution in this excel file: 12 factors 1063-1072

Now I’ll write a little bit about the number 1069:

  • 1069 is a prime number.
  • Prime factorization: 1069 is prime.
  • The exponent of prime number 1069 is 1. Adding 1 to that exponent we get (1 + 1) = 2. Therefore 1069 has exactly 2 factors.
  • Factors of 1069: 1, 1069
  • Factor pairs: 1069 = 1 × 1069
  • 1069 has no square factors that allow its square root to be simplified. √1069 ≈ 32.695565

How do we know that 1069 is a prime number? If 1069 were not a prime number, then it would be divisible by at least one prime number less than or equal to √1069 ≈ 32.7. Since 1069 cannot be divided evenly by 2, 3, 5, 7, 11, 13, 17, 19, 23, 29 or 31, we know that 1069 is a prime number.

The next prime number won’t be until 1087, making 1069 have a prime gap of 18. That’s two numbers short of the record for primes up to 1087, so it’s quite a lot!

Not only is 1069 a prime number, but OEIS.org informs us that
310693 is a prime number,
33106933 is a prime number,
3331069333 is a prime number, and
333310693333 is also a prime number!

30² + 13² = 1069

1069 is the hypotenuse of a Pythagorean triple:
731-780-1069 calculated from 30² – 13², 2(30)(13), 30² + 13²

Here’s another way we know that 1069 is a prime number: Since its last two digits divided by 4 leave a remainder of 1, and 30² + 13² = 1069 with 30 and 13 having no common prime factors, 1069 will be prime unless it is divisible by a prime number Pythagorean triple hypotenuse less than or equal to √1069 ≈ 32.7. Since 1069 is not divisible by 5, 13, 17, or 29, we know that 1069 is a prime number.

1069 looks interesting when it is written in a few other bases:
It’s palindrome 565 in BASE 14 because 5(14²) + 6(14) + 5(1) = 1069, and
4B4 in BASE 15 (B is 11 base 10) because 4(15²) + 11(15) + 4(1) = 1069, and
it’s consecutive odd digits 357 in BASE 18 because 3(18²) + 5(18) + 7(1) = 1069

1068 and Level 6

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The permissible common factors of 40 and 48 are 4 and 8, and the permissible common factors of 54 and 36 are 6 and 9. By themselves, neither of those pairs of clues is enough to get you started with this level 6 puzzle. You will have to study ALL the clues to begin to solve it. Believe it or not, sometimes a row or column with no clue is the best place to start.

Print the puzzles or type the solution in this excel file: 12 factors 1063-1072

This is my 1068th post so let me share a little information about the number 1068:

  • 1068 is a composite number.
  • Prime factorization: 1068 = 2 × 2 × 3 × 89, which can be written 1068 = 2² × 3 × 89
  • The exponents in the prime factorization are 2, 1, and 1. Adding one to each and multiplying we get (2 + 1)(1 + 1)(1 + 1) = 3 × 2 × 2 = 12. Therefore 1068 has exactly 12 factors.
  • Factors of 1068: 1, 2, 3, 4, 6, 12, 89, 178, 267, 356, 534, 1068
  • Factor pairs: 1068 = 1 × 1068, 2 × 534, 3 × 356, 4 × 267, 6 × 178, or 12 × 89,
  • Taking the factor pair with the largest square number factor, we get √1068 = (√4)(√267) = 2√267 ≈ 32.68027

1068 is the hypotenuse of a Pythagorean triple:
468-960-1068 which is 12 times (39-80-89)

1067 and Level 5

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The common factors of 20 and 40 are 1, 2, 4, 5, and 10. Only the ones in blue will put numbers from 1 to 12 in the top row, as required. Since there is more than one possible common factor, don’t start with those two clues. This is a level 5 puzzle so at least one pair of clues will work to get you started.

Print the puzzles or type the solution in this excel file: 12 factors 1063-1072

Here are a few facts about the number 1067:

  • 1067 is a composite number.
  • Prime factorization: 1067 = 11 × 97
  • The exponents in the prime factorization are 1 and 1. Adding one to each and multiplying we get (1 + 1)(1 + 1) = 2 × 2 = 4. Therefore 1067 has exactly 4 factors.
  • Factors of 1067: 1, 11, 97, 1067
  • Factor pairs: 1067 = 1 × 1067 or 11 × 97
  • 1067 has no square factors that allow its square root to be simplified. √1067 ≈ 32.66497

1067 is the hypotenuse of a Pythagorean triple:
715-792-1067 which is 11 times (65-72-97)
We can use the 11 divisibility trick on all the numbers in that triple:
7 – 1 + 5 = 11
7 – 9 + 2 = 0
1 – 0 + 6 – 7 = 0
to see that all of them can indeed be evenly divided by 11.

1067 is palindrome 1F1 in BASE 26 (F is 15 base 10) because 26² + 15(26) + 1 = 1067

1066 and Level 4

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Some of the clues in today’s puzzle were used in previous puzzles this week. Sometimes their factors have to be exactly the same as they were in the previous puzzles, but sometimes they might not be. Can you figure out where to put the numbers 1 to 12 in both the first column and the top row so that those numbers are the factors of the clues given?

Print the puzzles or type the solution in this excel file: 12 factors 1063-1072

Here are a few facts about the number 1066:

  • 1066 is a composite number.
  • Prime factorization: 1066 = 2 × 13 × 41
  • The exponents in the prime factorization are 1, 1, and 1. Adding one to each and multiplying we get (1 + 1)(1 + 1)(1 + 1) = 2 × 2 × 2 = 8. Therefore 1066 has exactly 8 factors.
  • Factors of 1066: 1, 2, 13, 26, 41, 82, 533, 1066
  • Factor pairs: 1066 = 1 × 1066, 2 × 533, 13 × 82, or 26 × 41
  • 1066 has no square factors that allow its square root to be simplified. √1066 ≈ 32.649655

29² + 15² = 1066
25² + 21² = 1066

1066 is the hypotenuse of FOUR Pythagorean triples:
616-870-1066 is 2 times (308-435-533) and calculated from 29² – 15², 2(29)(15), 29² + 15²
410-984-1066 which is (5-12-13) times 82
234-1040-1066 which is 26 times (9-40-41)
184-1050-1066 is 2 times (92-525-533) and calculated from 25² – 21², 2(25)(21), 25² + 21²

1066 looks interesting when it is written in some other bases:
It’s palindrome 1110111 in BASE 3 because 3⁶ + 3⁵ + 3⁴ + 3² + 3¹ +3⁰ = 1066,
13231 in BASE 5 because 1(5⁴) + 3(5³) + 2(5²) + 3(5) + 1(1) = 1066,
1414 in BASE 9 because 1(9³) + 4(9²) + 1(9) + 4(1) = 1066, and
2I2 in BASE 19 (I is 18 base 10) because 2(19²) + 18(19) + 2(1) = 1066

 

 

1065 and Level 3

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24 and 14 have two common factors, but just one of them will put only numbers from 1 to 12 in the first column. After you write those factors on the puzzle, work down the first column of the puzzle cell by cell writing the appropriate factors as you go.

Print the puzzles or type the solution in this excel file: 12 factors 1063-1072

Here are a few facts about the number 1065:

  • 1065 is a composite number.
  • Prime factorization: 1065 = 3 × 5 × 71
  • The exponents in the prime factorization are 1, 1, and 1. Adding one to each and multiplying we get (1 + 1)(1 + 1)(1 + 1) = 2 × 2 × 2 = 8. Therefore 1065 has exactly 8 factors.
  • Factors of 1065: 1, 3, 5, 15, 71, 213, 355, 1065
  • Factor pairs: 1065 = 1 × 1065, 3 × 355, 5 × 213, or 15 × 71
  • 1065 has no square factors that allow its square root to be simplified. √1065 ≈ 32.63434

1065 is the hypotenuse of a Pythagorean triple:
639-852-1065 which is (3-4-5) times 213

1065 is a palindrome in two bases:
It’s 353 in BASE 18 because 3(18²) + 5(18) + 3(1) = 1065
1A1 in BASE 28 (A is 10 base 10) because 28² + 10(28) + 1 = 1065

1064 and Level 2

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If you did yesterday’s puzzle, then you will recognize four of the clues in today’s puzzle. They will give you a good start in finding all the rest of factors. See how well you do on this one!

Print the puzzles or type the solution in this excel file: 12 factors 1063-1072

Now I’ll tell you a little bit about the number 1064:

Its 0 is an even digit, and its last two digits, 64, can be evenly divided by 8, so 1064 is also divisible by 8.

  • 1064 is a composite number.
  • Prime factorization: 1064 = 2 × 2 × 2 × 7 × 19, which can be written 1064 = 2³ × 7 × 19
  • The exponents in the prime factorization are 3, 1, and 1. Adding one to each and multiplying we get (3 + 1)(1 + 1)(1 + 1) = 4 × 2 × 2 = 16. Therefore 1064 has exactly 16 factors.
  • Factors of 1064: 1, 2, 4, 7, 8, 14, 19, 28, 38, 56, 76, 133, 152, 266, 532, 1064
  • Factor pairs: 1064 = 1 × 1064, 2 × 532, 4 × 266, 7 × 152, 8 × 133, 14 × 76, 19 × 56, or 28 × 38
  • Taking the factor pair with the largest square number factor, we get √1064 = (√4)(√266) = 2√266 ≈ 32.61901

The difference in the numbers in one of its factor pairs, 28 × 38, is exactly ten, so we are exactly 25 away from the next perfect square number:
33² – 5² = 1089 – 25 = 1064

I like the way 1064 looks in a couple of other bases:
It’s 888 in BASE 11 because 8(11² + 11 + 1) = 8(133) = 1064, and
it’s 248 in BASE 22 because 2(22²) + 4(22) + 8(1) = 1064