Question

Factor of 18
Factor of 21



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Answer 1

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What is the GCF of 18 and 21?

The GCF of 18 and 21 is 3. To calculate the greatest common factor (GCF) of 18 and 21, we need to factor each number (factors of 18 = 1, 2, 3, 6, 9, 18; factors of 21 = 1, 3, 7, 21) and choose the greatest factor that exactly divides both 18 and 21, i.e., 3.

Answer 2

Factor of 18 = 1, 2, 3, 6, 9 and 18.

Factor of 21 = 1, 3, 7 and 21.

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