What is the greatest common factor of 42, 126, and 210

Given the numbers 42, 126, and
210

We need to find the greatest common factor (
GCF)

First we will factor each
numbers.

==> 42 =
2*3*7

==> 126 =
2*3*3*7

==> 210 =
2*3*5*7

Now we will determine the common factors between
all three numbers and multiply.

We notice that the common
factors are 2 , 3 and 7.

Then the greatest
common factor = 2*3*7 = 42

Here
is a thorough video on how to find the Greatest Common
Factor.