Two common multiples of 21 and 15 are 105 and 315.
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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 .
The LCM of 15 and 21 is 105.The Least Common Multiple (LCM) for 15 21 is 105.
LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.
Common multiples include 168, 336 and 504
This cannot be determined because the common multiples of any two or more numbers are infinite.