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The LCM of 9 and 21 is 63, which is the multiple of the highest power of prime factors from both numbers, is 63. (3² x 7 = 3 x 3 x 7 = 63).

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LCM is least common multiple of two or more numbers. LCM of 9 and 21 will be:

9=3x3

21=3x7

LCM=9X7=63.

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10y ago
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63

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15y ago
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Q: What is the least common multiple of 21 and 9?
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