The greatest common factor is the highest number that divides exactly into two or more numbers.
18: 1, 2, 3, 6, 9, 18
40: 1, 2, 4, 5, 8, 10, 20, 40
The GCF for 18 and 40 is 2.
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8 is the greatest common factor for 48 and 40
The greatest common factor of 1824 , 40 = 8
The GCF of 10 and 40 is 10. 10 is a factor of 40, and 10 is the largest factor of itself, so 10 is the greatest common factor of 10 and 40.
The greatest common factor of 40, 64, and 16 is 8.
The Greatest Common Factor of 24, 40, 32 is 8.