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Factorize 7, 15, 19, 17, 4, 8

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a) 7 is a prime number so the only factor is 7.

b) 15 is a composite number.

We can start by dividing by 3 (as 2 is not a factor for 15), and get 5, that is a prime, so it ends there.

We can write 15 = 3 * 5

c) 19 is a prime number.

d) 17 is a prime number.

e) 4 is composite, and can be written as: 4 = 2 * 2

f) 8 is composite and can be written as 8 = 2 * 2 * 2

User Chris Ballard
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