What is the LCM of 80 and 20?

What's the Least Common Multiple (LCM) of 80 and 20?

Answer

LCM of 80 and 20 is

80

First common multiples: 80, 160, 240, …

As a common denominator: multiply the top and bottom of y/20 by 4.

20 divides 80 (80 ÷ 20 = 4), so the LCM is the larger number itself.

80 = 2⁴ × 5

20 = 2² × 5

Prime	80	20	Highest power
2	2⁴	2²	2⁴
5	5	5	5

LCM = 2⁴ × 5 = 80

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