What is the LCM of 10 and 20?

What's the Least Common Multiple (LCM) of 10 and 20?

Answer

LCM of 10 and 20 is

20

First common multiples: 20, 40, 60, …

As a common denominator: multiply the top and bottom of x/10 by 2.

10 divides 20 (20 ÷ 10 = 2), so the LCM is the larger number itself.

10 = 2 × 5

20 = 2² × 5

Prime	10	20	Highest power
2	2	2²	2²
5	5	5	5

LCM = 2² × 5 = 20

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