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Q: What are the common multiples of 21 and 11?

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LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.

Multiples of 21 include 21, 42, 63, 84 and so on. For them to be common, they need to be compared to another set of multiples.

there are infinite amount of common multiples.

Multiples of 21 include 21, 42, 63, 84 and 105. For them to be common, they need to be compared to another set of multiples.

They are multiples of 63

The common multiples of 9 and 21 are 63, 126, 189 and so on.

Two common multiples of 21 and 15 are 105 and 315.

The common multiples of 9 and 21 are 63, 126, 189 and so on.

The common multiples of 3 and 21 are 21, 42, 63 and so on.

The common multiples of 11 and 4 are 88, and 4.

They are: 407 and its multiples

The common multiples of 9 and 11 are 99, 198, 297 and so on.

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