Question

What’s the common factor for 72 and 84

Answer 1

Explanation:

This is the general method for doing this problem. First factor these numbers into primes.

72: 2 * 2 * 2 * 3 * 3

84: 2*2 * 3 * 7

Now each number has at least two 2s

Each number has at least one 3

The highest common factor is 2 * 2 * 3 = 12