15 and 21
21 and 35
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You need at least two numbers to find an LCM.
2 and 5 are both prime numbers. If you multiply them together, the answer is 10. 10 is the LCM of 2 and 5.
The least common multiple of 9 and 105 is 315.
The least common multiple of the numbers 105 and 90 is 630.
The least common multiple of the numbers 165 and 225 is 2,475.