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To find the common multiples of two numbers you first have to break them down into their prime factors. In this case, 3 and 10 can be broken down as:

3 = 3

10 = 2x5

The next step would be to identify any common factors, but as there are none, we simply take all these prime factors, and multiply them together:

2x3x5 = 30. If we multiply 30 by any integer it will give a value greater than 40. Thus the only number less than 40 that divides by 3 and 10 is 30.

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Q: What numbers divide by 3 and 10 that's less than 40?
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