1, 2, 4, 5, 8, 10, 20.
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The product of all of the factors of 40 is (1, 2, 4, 5, 8, 10, 20, 40) : 2,560,000
The common factors are: 1, 2, 4.
Since 8 is a factor of 40, it is automatically the GCF and all of its factors are common.
The prime factors of 40 are 2 and 5
Factors of 40 = 1,2,20 & 40.Factors of 80 = 1,2,4,20,40 & 80Therefore the highest common factor of 40 & 80... is 40