It is 4
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The greatest common factor of 1628 , 40 = 4
it is 40 because it is the greatest common factor for the numbers10 and 40
1, 2, 4 are the common factors of 12 and 40, and 4 is the greatest common factor
The Greatest Common Factor of 40 and 18 is 2.
The GCF is 4.