Question

What is the greatest common factor of both 9 and 12?

Answer 1

`3`

Explanation:

The greatest common factor is the largest number that two numbers can both be divided by to yield a whole number. `9/3 = 3` and `12/3 = 4`.

By making factor trees you can identify the largest common factors of two numbers. `9 = 3*3` and `12 = 2*2*3`, in this case the only common factor is 3 and therefore the greatest.