Steve S. answered • 04/02/14
Tutor
5
(3)
Tutoring in Precalculus, Trig, and Differential Calculus
Just break each number down into a product of prime numbers, then pick out the ones common to both.
12 = 2*2*3
42 = 2*3*7
So the common factor is 2*3 = 6
12 = 6*2
42 = 6*7
