Question

What is the greatest common factor for 78 and 91?

Answer 1

`13`

Explanation:

To find the GCF you can proceed as follows.

Given two numbers, divide the larger by the smaller to give a quotient and remainder.

If the remainder is zero, then the smaller number is the GCF.

Otherwise repeat with the smaller number and the remainder.

So for `78` and `91` we proceed as follows:

`91 / 78 = 1` with remainder `13`

`78 / 13 = 6` with remainder `0`

So `13` is the GCF.