Question

What is the greatest common factor for 84 and 56?

Answer 1

Factors of 56 are: 1, 2, 4, 7, 8, 14, 28, 56

Factors of 84 are: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84

The outside term multiplies by the outside term on the oposite side to equal the answer. 

Example:
Look at the factors of 84
84X1=84
2X42=84
3X28=84 
and so on!