Question

What is the highest common factor of 20 and 30

Answer 1

The greatest common factor of 20 and 30 is 10

Answer 2

10

Explanation:

the factors of 20 are 1, 2, 4, 5, 10, 20

the factors of 30 are 1, 2, 3, 5, 6, 10, 15, 30

the common factors are 1, 2, 5, 10

the highest common factor is 10