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30

To find the lowest common multiple you first split the numbers into their prime factors. In this case, we have:

10 = 2x5

15 = 3x5

The next step is to identify any common factors and discard them. Both numbers have 5 as a common prime factor, so we can discard one of them. Take all the other prime factors (2, 3 and 5) and multiply them together:

2x3x5 = 30

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

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Q: What is the lowest common multiple of 15 and 10?
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