Because 24 does not divide exactly into 36 ! For any number to be a factor of another number - it must divide exactly into it with no remainder. The same applies to GCF
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The greatest common factor of 540 and 1430 is 10.
36 and 72 8 and 9
Since 12 is a factor of 36, it is automatically the GCF.
12 and 24 have the greatest common factor of 12, among many others.
The Greatest Common Divisor (GCD) for 12 36 42 is 6.