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What is the LCM of 7 and 21?

Updated: 4/28/2022
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7y ago

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LCM is 21, which is the multiple of the highest power of prime factors in the given numbers (3 x 7).
The LCM is 21.

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7y ago
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13y ago

The least common denominator would be 7. So the if it were a fraction being reduced. Seven goes into seven one time and seven goes into twenty-one three. So the fraction would be 3/1.

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Q: What is the LCM of 7 and 21?
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