(320,1)(160,2)(80,4)(64,5)(40,8)(32,10)(20,16)
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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.
The greatest common factor of 21 and 54 is 3. The greatest common factor is the highest number that divides exactly into two or more numbers. factors of 21: 1, 3, 7, 21 factors of 54: 1, 2, 3, 6, 9, 18, 27, 54 The greatest common factor of 21 and 54 is 3.
3 and 20 have no common factor so LCM is 3 x 20 ie 60
-- The common factors of 3, 15, and 9 are 1 and 3 . -- Their greatest common factor is 3 . -- When discussing numbers, there is no such thing as the 'most' common factor.
Since 10 is a factor of 20, all of its factors are common.