How do you find the GCF of 34 and 51?

Answer 1

The factors of 34 are:

1, 2, 17, 34

The factors of 51 are:

1, 3, 17, 51

The common factors are:

1, 17

The Greatest Common Factor:

GCF = 17

Answer 2

Prime factorisation.

34 = 2*17

51 = 3*17

The only prime factor that is common to both is 17.

So GCF(34, 51) = 17