Factor them.
2 x 2 x b x b = 4b2
2 x 3 x b x b x b = 6b3
Combine the factors, eliminating duplicates.
2 x 2 x 3 x b x b x b = 12b3, the LCM
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Since 63 is a multiple of 9, it is automatically the LCM.
The LCM of 63 and 135 is 945.
The Least Common Multiple (LCM) of (37,12) is 444.
Until that other number shows up, the LCM is 63.
456