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# What are the common multiples of 21?

Updated: 8/29/2023 Wiki User

6y ago

The common factors are 1 and 7. (7 = 1 x 7 and 21 = 3 x 7)

The only common prime factor is 7, which is also the largest common factor. Wiki User

7y ago   Wiki User

6y ago

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.   Wiki User

11y ago

You need at least two numbers to find a GCF.   Wiki User

6y ago

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.   Earn +20 pts
Q: What are the common multiples of 21?
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Still have questions?  Related questions

### Common multiples of 21 and 49?

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

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

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

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

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Any pair of numbers has an infinite set of common multiples. The lowest common multiple of 9 and 21 is 63 and the others are multiples of this, e.g. 63, 126, 189, 252, 315, ...

### What are the common multiples of 3 7 but not 6?

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### What is another common multiple of 21?

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.

### What are common multiples of 3 and 21?

Any multiple of 21.

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