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The easiest way that I know to do this is to factor each number, drop out the factors that are shared, and multiply the factors that are left.
11 is prime already.
22 = 2 X 11
12 = 2 X 2 X 3
Drop out one of the 11's because it is shared. Drop out a 2 that is shared. What is left is:
11 X 2 X 2 X 3 = 132
Test to make sure it is right.
132 / 11 = 12
132/22 = 6
132/12 = 11
It checks out ok, so give the final answer.
Answer: 132
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