l GCF of 10 and 9

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Determine GCF(10,9)

GCF = Largest factor that divides numbers

Determine the factors for 10

1,2,5

Determine the factors for 9

1,3,9

List the common factors

1



GCF(10,9) = 1

Evaluate GCF

Since GCF = 1, they are relatively prime (co-prime)

Since GCF ≠ 1 and have a difference of two, the numbers are not twin prime

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