First, factorise 60 and 156:
Factors of 60: 2,2,3,5
Factors of 156: 2,2,3,13.
Highlight common factors:
60: 2,2,3,5
156: 2,2,3,13
Common factors: 2,2,3
The product of these common factors is:2*2*3=12.
This number, 12, is your greatest common factor:
Greatest Common Factor( 60, 156 ) = 12.
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