Yes, 5 is a factor of 80. It evenly divides into 80. Any integer ending in 0 or 5 is evenly divisible by 5, so all of those numbers have 5 as a factor.
5 x 16 = 80
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The greatest common factor of 25 and 80 is 5.
80= 2*2*2*2*5 35= 5*7 The only factor they have in common is 5, so the answer is 5.
The five factor pairs of 80 are:80 = 1 x 8080 = 2 x 4080 = 4 x 2080 = 5 x 1680 = 8 x 10
The greatest common factor of 70 and 80 is 10. The prime factorization of 70 is 2*5*7 The prime factorization of 80 is 2*2*2*2*5 The GCF is 2*5 = 10
The greatest common factor of 54 and 80 is 2