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To find the LCM of two numbers you first express them as their prime factors. In this case we have:

9 = 3x3

11 = 11

The next step would be to identify any common factors. In this case there are none, so simply take all the factors (3, 3 and 11) and multiply them together:

3x3x11 = 99

Thus the LCM of 9 and 11 is 99.

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13y ago

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