Question

Which of the following lists shows all the factors of 36?

2, 3, 4, 6, 9, 12, 18
1, 2, 3, 4, 9, 12, 18, 36
1, 2, 3, 4, 6, 9, 12, 18, 36
36, 72, 108, ...

Answer 1

It's 1, 2, 3, 4, 6, 9, 12, 18, 36.

Explanation:

First of all the list must contain 1 and 36 so it is not the first or last choice.

Find the prime factors:

36 = 2*2*3*3

So the other factors are 2 and 3 and the products formed from these factors

which are 4, 6, 9, 12, 18.