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18 = 2 x 3 x 3; 21 = 3 x 7. Common factor is 3 so LCM = 18 x 21/3 = 126

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14y ago
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11y ago

2 x 3 x 3 = 18
3 x 7 = 21
Combine the factors, eliminating duplicates.
2 x 3 x 3 x 7 = 126, the LCM

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Q: What is the LCM of 21 and 18 using prime factorization?
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