Any pair of numbers that only have one 5 as a common prime factor.
Examples:
5 and 15
35 and 45
75 and 115
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The GCF is 1.
To determine what number goes into 5, 7, and 8, we need to find the greatest common factor (GCF) of these three numbers. The GCF is the largest number that divides evenly into all three numbers. In this case, the GCF of 5, 7, and 8 is 1, as there are no common factors other than 1 among these numbers. Therefore, the number that goes into 5, 7, and 8 is 1.
7 and 35 (35 = 5*7)
2^3 x 3^2 x 5 = 360 You need at least two numbers to find a GCF.
GCF(1, 5, 10) = 1. The GCF of any set of numbers containing 1 must be 1.