Question

Which is the prime factorization of twenty-eight?

two times fourteen

two times two times seven

four times seven

one times twenty-eight

Answer 1

A prime number does not have any factors except itself and 1

any answer that does not have primes is wrong.

Answer 2

Start with the number 28

Answer 3

also, the prime factorization will have more numbers than a factorization that has some composite factors.

Answer 4

Then break that number into 4*7

This works because 28 = 4*7.

Write each factor below 28 on their own separate branch like this