2 and 24
6 and 8
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20 and 100.GCF is 20, and LCM is 100.
12 and 66
126 and 90 (trial and error gets you the answer)
4 and 40 8 and 20
The GCF of two numbers multiplied by their LCM will equal the product of the original numbers. If you know the GCF, divide it into the product of the two. The result will be the LCM. If the GCF of two numbers is 1, the LCM is their product.