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To make this easier, let's first factor 18 and 21 into their prime factors:

18=2*3^2

21=3*7

Now it's very easy to find the LCM and GCF. The LCM is 2*3^2*7=126, and the GCF is 3.

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โˆ™ 2010-06-11 15:01:41
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Q: What is the LCM and the GCF of 18 and 21?
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