Question

The GCF of 14 and a number is 7. Which of the following could be the number?

A 49

B 42

C 56

Answer 1

A 49

Explanation:

Any odd number that has 7 as a factor will be a candidate. Of the choices listed, the only possibility is ...

49

__

If the number is even and has 7 as a factor, then it will be a multiple of 14. That is, the GCF will not be 7, but will be 14. Hence, the number must be an odd multiple of 7.