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How do you find LCM of 28 and 21?

Updated: 12/18/2022

Wiki User

∙ 12y ago

Best Answer

First you express the numbers as the product of their prime factors:

28 = 2x2x7

21 = 3x7

Next you find the HCF. In this case, the HCF is 7. Finally, you multiply the numbers together and divide by the HCF. 28x21/7 = 84

Therefore the LCM of 28 and 21 is 84.

Wiki User

∙ 12y ago

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