Question

Select a factor of 28 that isn't a factor of 36.

• A. 9
• B. 4
• C. 7

Answer 1

The correct option is C 7

Factors of 28 are 1, 2, 4, 7, 14 and 28.

1 $\times$ 28 = 28
2 $\times$ 14 = 28
4 $\times$ 7 = 28

Factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18 and 36.

1 $\times$ 36 = 36
2 $\times$ 18 = 36
3 $\times$ 12 = 36
4 $\times$ 9 = 36
6 $\times$ 6 = 36


The factor of 28 which is not a factor of 36 is 7.