80
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The factors of 16 are:1, 2, 4, 8, 16The factors of 40 are:1, 2, 4, 5, 8, 10, 20, 40The common factors are:1, 2, 4, 8The Greatest Common Factor:GCF = 8
The Greatest Common Factor (GCF) of 20 and 36 is: 4
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.
20
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