LCM for 8, 10 and 20

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What's the Least Common Multiple (LCM) of 8, 10 and 20?

Answer

LCM of 8, 10 and 20 is
40

First common multiples: 40, 80, 120, …

40 is divisible by all three: 40 ÷ 8 = 5, 40 ÷ 10 = 4, 40 ÷ 20 = 2 — and 5, 4 and 2 have no factor but 1 common to all of them, so no smaller number is. As a common denominator: multiply the top and bottom of x/8 by 5 and of y/10 by 4 and of z/20 by 2.

8 = 23

10 = 2 × 5

20 = 22 × 5

Prime81020Highest power
22322223
5—555

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

LCM = 23 × 5 = 40

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LCM Table

1st2nd3rdLCM
581040
6810120
7810280
881040
8910360
8101040
81011440
81012120
81013520
81014280
81015120
8101680
81017680
81018360
81019760
8102040
81021840
81022440
81023920
81024120
81025200
81026520
810271,080
81028280
810291,160
81030120
810311,240
81032160
810331,320
81034680

FAQ

What's the Least Common Multiple (LCM) of 8, 10 and 20?

LCM of 8, 10 and 20 is 40

How to find the LCM of 8, 10 and 20 by prime factorization?

Take every prime that appears in 8, 10 and 20 to the highest power it reaches in any one of them and multiply: 2³ × 5 = 40.

Can you get the LCM of 8, 10 and 20 two numbers at a time?

Yes. The LCM of 8 and 10 is 40, and the LCM of 40 and 20 is 40 — the same answer, because the least common multiple is associative and does not depend on the order of the three numbers.

Is 40 divisible by 8, 10 and 20?

Yes, and by definition it is the smallest positive integer that is: 40 ÷ 8, 40 ÷ 10 and 40 ÷ 20 all come out whole. Any other common multiple of 8, 10 and 20 is a multiple of 40.

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