What is the LCM of 40 and 80?

What's the Least Common Multiple (LCM) of 40 and 80?

Answer

LCM of 40 and 80 is

80

First common multiples: 80, 160, 240, …

As a common denominator: multiply the top and bottom of x/40 by 2.

40 divides 80 (80 ÷ 40 = 2), so the LCM is the larger number itself.

40 = 2³ × 5

80 = 2⁴ × 5

Prime	40	80	Highest power
2	2³	2⁴	2⁴
5	5	5	5

LCM = 2⁴ × 5 = 80

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