The GCF is 4.
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The factors of 16 are 1, 2, 4, 8 and 16. For them to be common, they need to be compared to another set of factors.
The factors of 16 are 1, 2, 4, 8, and 16.The factors of 40 are 1, 2, 4, 5, 8, 10, 20, and 40.The common factors of 16 and 40 are 1, 2, 4, and 8.
The common factors of 16 and 20 are 1, 2, and 4. The greatest or highest common factor is the highest number that divides exactly into two or more numbers. 16: 1, 2, 4, 8, 16 20: 1, 2, 4, 5, 10, 20 The greatest common factor for 16 and 20 is 4. --- To find using primes: 16 = 2 x 2 x 2 x 2 20 = 2 x 2 x 5 Common primes (2, 2) and 2 x 2 = 4
80
The factors of 64 are:1, 2, 4, 8, 16, 32, 64The factors of 80 are:1, 2, 4, 5, 8, 10, 16, 20, 40, 80The common factors are:1, 2, 4, 8, 16