1 and 5
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A factor is a divisor - a number that will evenly divide into another number. The greatest common factor of two or more numbers is the largest factor that both numbers have in common. 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 85 are 1, 5, 17, and 85. The factors of 115 are 1, 5, 23, and 115. The common factors are 1 and 5. Therefore, the greatest common factor is 5.
The factors of 65 are: 1, 5, 13, 65 The factors of 115 are: 1, 5, 23, 115 The common factors are: 1, 5
The common factors of 51 and 85 are: 1 and 17.
The common factors of 65 and 85 are: 1 and 5
The GCF is 5.