Best Answer

Find LCM (18,40).

Method 1:

18 = 2 x 3 x 3

40 = 2 x 2 x 2 x 5

GCF (18,40) = 2

LCM(18,40) = (18 x 40)/GCF(18,40)

LCM(18,40) = 720 / 2

LCM(18,40) = 360

Method 2:

40: 40, 80, 120, 160, 200, 240, 280, 320, 360, 400, 440, 480, 520, 560, 600

18: 18, 36, 54, 72, 90, 108, 126, 144, 162, 180, 198, 216, 234, 252, 270, 288, 306, 324, 342, 360

I would not recommend using this method because it takes so much longer, but if you cannot remember how to do it the other way, use this method.

Q: What is the lowest common multiple of 40 and 18?

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The lowest common multiple of 8 and 20 is 40. 8 x 5 = 40 and 2 x 20 = 40.

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