Here are some numbers.

5 4 3 9 7

Which of these numbers is:

a factor of 32?

a common factor of 12 and 21?

4 is a factor of 32

and 3 is a common factor of 12 and 21

A factor is an integer multiplied with another integer to get the product.

Factors of 32 are 1, 2, 4, 8, 16, 32. Among the given choices, 4 is the factor of 32.

Factors of 12 are 1, 2, 3, 4, 6, 12

Factors of 21 are 1, 3, 7, 21

The common factors of 12 and 21 are 1 and 3. Among the given choices, 3 is the common factor of 12 and 21.