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Q: What are the first three common multiples of 9and 21?

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Just 90.

It's 72

Multiples of 20 are 20, 40, 60, 80 and 100. For them to be common, they need to be compared to another set of multiples.

It is: 1

3

144

36

18

The GCF is 3.

The GCF is 9.

It is: 252

The GCF is 3.