20 x 3 = 60
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3 and 20 have no common factor so LCM is 3 x 20 ie 60
Factor out each term to get: 20 = 2² x 5 99 = 3 x 33 = 3² x 11 Since these terms don't have the common factor, the common factor is 1.
A factor = a number which can be divided into the given number with no remainder so no, 3 is not a factor of 20
The GCF is 20.
The factor pairs of 20 are: 20,1 / 10,2 / 5,4