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The GCF of 40 and 120 is 40.
One way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them.
The factors of 40 are 1, 2, 4, 5, 8, 10, 20, and 40.
The factors of 120 are 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, and 120.
The common factors are 1, 2, 4, 5, 8, 10, 20, and 40. Therefore, the greatest common factor is 40.
Since 40 is a factor of 120, it is automatically the GCF.
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