90 and 180 have a GCF of 90.
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You need at least two numbers for a GCF.
40 and 50
45 and 10
10 and 45. 10=5*2 10+45=55 45*2=90 45=5*9 10*9=90
If one of the numbers is a multiple of the other, the smaller number is the GCF. If the two numbers are prime numbers, the GCF is 1. If the numbers are consecutive, the GCF is 1. If the numbers are consecutive even numbers, the GCF is 2.