2, 4, 5, 8, 10, 20, 25, 40, 50, 100
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1.
1: the numbers are co-prime.
' 1 ' is the only number that divides evenly into both 87 and 100.
The greatest common factor is a number that divides evenly into two or more numbers. It is also called the highest common factor or greatest common divisor.