1 2 3 6 9.
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The factors of 15 are: 1, 3, 5, 15 The factors of 18 are: 1, 2, 3, 6, 9, 18
The first step is to break the numbers down into their prime factors: 18 = 2x3x3 5 = 5 The next step would be to identify any common factors. In this case, there are none. Thus we simply multiply all the factors together: 2x3x3x5 = 90 And so the LCM of 18 and 5 is 90.
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Prime factors of 18 are 2 and 3 Prime factors of 45 are 3 and 5