LCM for 12, 15 and 28

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What's the Least Common Multiple (LCM) of 12, 15 and 28?

Answer

LCM of 12, 15 and 28 is
420

First common multiples: 420; 840; 1,260; …

420 is divisible by all three: 420 ÷ 12 = 35, 420 ÷ 15 = 28, 420 ÷ 28 = 15 — and 35, 28 and 15 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 35 and of y/15 by 28 and of z/28 by 15.

12 = 22 × 3

15 = 3 × 5

28 = 22 × 7

Prime121528Highest power
222—2222
333—3
5—5—5
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 × 3 × 5 × 7 = 420

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LCM Table

1st2nd3rdLCM
121315780
121415420
12151560
121516240
1215171,020
121518180
1215191,140
12152060
121521420
121522660
1215231,380
121524120
121525300
121526780
121527540
121528420
1215291,740
12153060
1215311,860
121532480
121533660
1215341,020
121535420
121536180
1215372,220
1215381,140
121539780
121540120
1215412,460
121542420

FAQ

What's the Least Common Multiple (LCM) of 12, 15 and 28?

LCM of 12, 15 and 28 is 420

How to find the LCM of 12, 15 and 28 by prime factorization?

Take every prime that appears in 12, 15 and 28 to the highest power it reaches in any one of them and multiply: 2² × 3 × 5 × 7 = 420.

Can you get the LCM of 12, 15 and 28 two numbers at a time?

Yes. The LCM of 12 and 15 is 60, and the LCM of 60 and 28 is 420 — the same answer, because the least common multiple is associative and does not depend on the order of the three numbers.

Is 420 divisible by 12, 15 and 28?

Yes, and by definition it is the smallest positive integer that is: 420 ÷ 12, 420 ÷ 15 and 420 ÷ 28 all come out whole. Any other common multiple of 12, 15 and 28 is a multiple of 420.

See Also