The Least Common Multiple (LCM) for 9 15 is 45.
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The biggest common divisor of 9 and 15 is 3. To find the least common multiples of 9 an 15 you should multiply these numbers and divide the result by their biggest common divisor. 9x15/3=45
45
The Least Common Multiple (LCM) for 9 21 15 is 315.
45
It is: 360