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The LCM of 90 and 100 is 900.

First, find the prime factors:

90 = 2*3*3*5

100 = 2*2*5*5

Then, to find the least common multiple (LCM), multiply the factors (only include shared factors once)

LCM = 2*2*3*3*5*5 = 900

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14y ago

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