What is the LCM of 5 and 20?

What's the Least Common Multiple (LCM) of 5 and 20?

Answer

LCM of 5 and 20 is

20

First common multiples: 20, 40, 60, …

As a common denominator: multiply the top and bottom of x/5 by 4.

5 divides 20 (20 ÷ 5 = 4), so the LCM is the larger number itself.

5 — prime

20 = 2² × 5

Prime	5	20	Highest power
2	—	2²	2²
5	5	5	5

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

LCM = 2² × 5 = 20

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