Q: What is the LCM of 21 and 12?

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LCM of 12 and 21 is 84, which is also a multiple of 28 so 84 is your answer.

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The LCM of 12 and 21 is 84. To find the LCM, prime factor both numbers then multiply each factor the most times it was used in either number.12=2x2x321=3x7lcm=2x2x3x7=84The Least Common Multiple (LCM) for 12 21 is 84.