### 18 Up on the Housetop

18 is a composite number. 18 = 1 x 18, 2 x 9, or 3 x 6. Factors of 18: 1, 2, 3, 6, 9, 18. Prime factorization: 18 = 2 x 3 x 3, which can also be written 18 = 2 x 3².

When 18 is a clue in the FIND THE FACTORS puzzles, use either 2 x 9 or 3 x 6. Only one set of factors will work for any particular puzzle.

Up on the housetop reindeer pause

Out jumps good old Santa Claus

Down through the chimney with lots of toys

All for the little ones, Christmas joys.

Up on the housetop – to solve these puzzles will require you to have knowledge of the multiplication facts and just a little imagination to see the housetops (and maybe the ability to tilt your head for most of them.) Place the numbers 1 – 10 in both the top row and the first column so that those numbers are the factors of the given clues. Click 10 Factors 2013-12-23 to print these puzzles or see last week’s solutions. In order to view the file, you need excel or other comparable spreadsheet program.

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