Ummmmm. Your question has no answer as it is written.
Either you want the greatest common factor or the least common multiple.
Here is both.
36 factors to [2 2 3 3]
90 factors to [2 3 3 5]
Common factors are [2 3 3] = 18 ◄
LCM is the product of both numbers divided by the GCF.
36 * 90 / 18 = 180 ◄
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Greatest Common Divisor (GCD) for 90 36 is 18.
The greatest common multiple of any set of multiples is infinite.
It is: 18
I don't know what GMF is, but:GCF (Greatest Common Factor) of 90 and 105 is 15LCM (Lowest Common Multiple) of 90 and 105 is 630
The set of (90,90) has a GCF and an LCM of 90.The set of (-90,-90) has a GCF and an LCM of 90.