200 and Level 1

200 is a composite number.
Factor pairs: 200 = 1 x 200, 2 x 100, 4 x 50, 5 x 40, 8 x 25, or 10 x 20
Factors of 200: 1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 200
Prime factorization: 200 = 2 x 2 x 2 x 5 x 5, which can be written 200 = (2^3) x (5^2)

200 is the smallest positive number that cannot be turned into a prime number by changing ONE of its digits to a different digit. If you can remember that little fact, if should help you to remember that ALL the numbers from 200 to 210 are composite numbers.

2014-32 Level 1

Excel file of puzzles and previous week’s factor solutions: 12 Factors 2014-08-11

2014-32 Level 1 Factors

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