common factors of 20,25,40
The factors of 20 are:1, 2, 4, 5, 10, 20The factors of 25 are:1, 5, 25The factors of 40 are:1, 2, 4, 5, 8, 10, 20, 40The common factors are:1, 5The Greatest Common Factor:GCF = 5