Question

Common factors of 20,25,40

Answer 1

The factors of 20 are:
1, 2, 4, 5, 10, 20

The factors of 25 are:
1, 5, 25

The factors of 40 are:
1, 2, 4, 5, 8, 10, 20, 40

The common factors are:
1, 5

The Greatest Common Factor:
GCF = 5