LCM for 20 and 55

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What's the Least Common Multiple (LCM) of 20 and 55?

Answer

LCM of 20 and 55 is
220

First common multiples: 220, 440, 660, …

220 is divisible by both: 220 ÷ 20 = 11, 220 ÷ 55 = 4 — and 11 and 4 share no factor but 1, so no smaller number is. As a common denominator: multiply the top and bottom of x/20 by 11 and of y/55 by 4.

20 = 22 × 5

55 = 5 × 11

Prime2055Highest power
222—22
5555
11—1111

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

LCM = 22 × 5 × 11 = 220

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LCM Table

Number 1Number 2LCM
2034340
2035140
2036180
2039780
204040
2043860
2044220
2045180
2046460
2047940
2048240
2050100
20511,020
20531,060
2054540
2055220
2058580
206060
2070140
2075300
2084420
2090180
20100100
20105420
20125500
20135540
20140140
20145580
20150300
20160160

FAQ

What's the Least Common Multiple (LCM) of 20 and 55?

LCM of 20 and 55 is 220

How to find the LCM of 20 and 55 using prime factorization?

To find the LCM of 20 and 55, find all prime factors of both numbers, then multiply the highest power of each prime factor. The result is 220.

What is the difference between LCM and GCF?

LCM (Least Common Multiple) is the smallest number divisible by both numbers, while GCF (Greatest Common Factor) is the largest number that divides both. For 20 and 55: LCM = 220, GCF = 5.

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