Two common multiples of 21 and 15 are 105 and 315.
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∙ 2011-03-18 01:08:14105 and 210 are.
There are an infinite number of common multiples of 21 and 15 .The smallest two of them are 105 and 210 . A couple of others are 1,890 and 453,705 .
105 and 210
105
There is an infinite number of common multiples for 21 and 15. A common multiple of any two or more numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).
The LCM of 15 and 21 is 105.The Least Common Multiple (LCM) for 15 21 is 105.
105, 210
315
21 and 28
You need at least two numbers to find a common multiple. Multiples of 21 in that range include 21, 42, 63 and 84
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.