What is the LCM of 28 and 84?

What's the Least Common Multiple (LCM) of 28 and 84?

Answer

LCM of 28 and 84 is

84

First common multiples: 84, 168, 252, …

As a common denominator: multiply the top and bottom of x/28 by 3.

28 divides 84 (84 ÷ 28 = 3), so the LCM is the larger number itself.

28 = 2² × 7

84 = 2² × 3 × 7

Prime	28	84	Highest power
2	2²	2²	2²
3	—	3	3
7	7	7	7

— = power 0: the prime is not a factor of this number; the LCM takes it from the number that has it.

LCM = 2² × 3 × 7 = 84

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Multiples of a Number - List the first 10 multiples of any number from 1 to 999

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