Question

What is the gcd of 10 and 20?

Answer 1

To get the Greatest Common Divisor (GCD) of 10 and 20 we need to factor each value first and then we choose all the copies of factors and multiply them: 

10:   2 *5.
20:   2*2*5
GCF:   2 *5

The Greatest Common Divisor (GCD) is:   2 x 5 = 10

Answer 2

gcd of 10 and 20 is 10