Name a prime number that is a factor of 10 and 15?

Answer 1

10 = 2 * 5

15 = 3 * 5

The shared prime factor is 5.

Another way to find this is by finding the greatest common denominator (gcd).

Answer 2

for 15 it is 3 and 5

for 50 it is 2, 5, and 5

Answer 3

1 3 5 and 15

Answer 4

3 x 5 = 15