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