The greatest factor of 60 is 60.
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The GCF is 4.
the factors of 60 are 1,2,3,4,5,6,10,12,15,20,30,60
The common factors of 60 and 231 are 1 and 3.
42 prime factors -----> 2,3,7 105 prime factors -----> 3,5,7 There is 3 and 7 in common : There fore 3*7 = 21; 21 is the greatest common factor.
Common factors of 52 and 60 are 1, 2 and 4.