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The most common multiples are 13 3 3234 2 2 2 2 232

Q: What are the first 3 common multiples of 16and 21?

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21, 42 and 63

They are: 21, 42 and 63

If that's 9, 14 and 21, the first three common multiples are 126, 252 and 378.

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

105 and 210

21

there are infinite amount of common multiples.

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.

7, 14, 21

63, 126, 189

42, 84, 126