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To find the least common multiples of two numbers, you have to first split them into their prime factors:

15 = 3x5

10 = 2x5

The next step is to identify any common prime factors. In this case both numbers have a 5 as a prime factor, so one of these can be discarded. Take every other prime factor (2, 3 and 5) and multiply them together:

2x3x5 = 30

Thus the least common multiple of 15 and 10 is 30.

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13y ago

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