9= 9,18,27,36,45,54,63,72,81,90,99,108,117,126,135,144,153,162 ect. ect. ect. ,315
15=15,30,45,60,75,90,105,120,135,150,165,180,195,210,225,240,255,270,285
,300,315
21= 21,42,63,84,105,126,147,168,189,210,231,252,273,294,315
The answer is 315.
wow that took me a while....
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Two common multiples of 21 and 15 are 105 and 315.
The Least Common Multiple of 21 and 30 is 210.
Their lowest common multiple is 63.
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.