Q: What is the GCF of 90 and 21?

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The GCF is 3.

The GCF is 1.

3 3*7=21 3*30=90 * * * * * That is the Greatest Common Factor, GCF, not the LCM. LCM(21, 90) = 630

The GCF is 3.

The GCF is 1.

The GCF is 1.

the GCF is 3.

The GCF is 90.

The GCF of 15 and 90 is 15.

The GCF is 5.

The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42.The factors of 90 are: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90.The common factors are: 1, 2, 3, 6The Greatest Common Factor (GCF) is: 6

If A is a factor of 90, the GCF is A. If A is a multiple of 90, the GCF is 90. If A is co-prime with 90, the GCF is 1.