What is the greatest common factor of 30 and 100?

Answer 1

The GCF of 30 and 100 is 10.

The prime factorization of 30 is 2x3x5

The prime factorization of 100 is 2x2x5x5

GCF(30, 100) = 2x5 = 10

Answer 2

There cannot be a greatest common factor (GCF) of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.

Answer 3

You need at least two numbers to find a GCF.

Answer 4

Since 10 is a factor of 30, it is automatically the GCF.

Answer 5

The GCF is 10.

Answer 6

The GCF is 100.

Answer 7

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