LCM for 12, 18 and 28

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What's the Least Common Multiple (LCM) of 12, 18 and 28?

Answer

LCM of 12, 18 and 28 is
252

First common multiples: 252, 504, 756, …

252 is divisible by all three: 252 ÷ 12 = 21, 252 ÷ 18 = 14, 252 ÷ 28 = 9 — and 21, 14 and 9 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/12 by 21 and of y/18 by 14 and of z/28 by 9.

12 = 22 × 3

18 = 2 × 32

28 = 22 × 7

Prime121828Highest power
22222222
3332—32
7——77

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

LCM = 22 × 32 × 7 = 252

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LCM Table

1st2nd3rdLCM
121318468
121418252
121518180
121618144
121718612
12181836
121819684
121820180
121821252
121822396
121823828
12182472
121825900
121826468
121827108
121828252
1218291,044
121830180
1218311,116
121832288
121833396
121834612
1218351,260
12183636
1218371,332
121838684
121839468
121840360
1218411,476
121842252

FAQ

What's the Least Common Multiple (LCM) of 12, 18 and 28?

LCM of 12, 18 and 28 is 252

How to find the LCM of 12, 18 and 28 by prime factorization?

Take every prime that appears in 12, 18 and 28 to the highest power it reaches in any one of them and multiply: 2² × 3² × 7 = 252.

Can you get the LCM of 12, 18 and 28 two numbers at a time?

Yes. The LCM of 12 and 18 is 36, and the LCM of 36 and 28 is 252 — the same answer, because the least common multiple is associative and does not depend on the order of the three numbers.

Is 252 divisible by 12, 18 and 28?

Yes, and by definition it is the smallest positive integer that is: 252 ÷ 12, 252 ÷ 18 and 252 ÷ 28 all come out whole. Any other common multiple of 12, 18 and 28 is a multiple of 252.

See Also