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3 years ago

15

Common factors of 20 and 42

2 answers:

lawyer [7]3 years ago

8 0

2 is a common factor for both of them.

zavuch27 [327]3 years ago

6 0

They are 1 and 2, because the prime factorization of 20 is 2*2*5, and the prime factorization of 42 is 2*3*7.
You can find the prime factorization of any number at this website, for future reference: http://www.calculatorsoup.com/calculators/math/prime-factors.php

I hope this helps you.

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