How do you find the greatest common factor of $140n, 140m^2, 80m^2$ ?

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Answer 1 · 2016-12-11T22:30:33

Factorize. But you can see at a glance that the letters have no common factor.

So we're left with finding the GCF of $140,140,80$

$140=7xx20and 80=4xx20$

So the GCF $=20$ (no common factors between $4$ and $7$ )

Note:
Of course you could factorize all the way down to the primes:

$140n=2xx2xx5xx7xxn$ , etc.

How do you find the greatest common factor of 140n, 140m^2, 80m^2140n, 140m^2, 80m^2?