LCM for 12 and 28

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

Answer

LCM of 12 and 28 is
84

First common multiples: 84, 168, 252, …

84 is divisible by both: 84 ÷ 12 = 7, 84 ÷ 28 = 3 — and 7 and 3 share no factor but 1, so no smaller number is. As a common denominator: multiply the top and bottom of x/12 by 7 and of y/28 by 3.

12 = 22 × 3

28 = 22 × 7

Prime1228Highest power
2222222
33—3
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 × 7 = 84

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LCM Table

Number 1Number 2LCM
1213156
121484
121560
121648
1217204
121836
1219228
122060
122184
1222132
1223276
122424
1225300
1226156
1227108
122884
1229348
123060
1231372
123296
1233132
1235420
123636
1239156
1240120
124284
1244132
1245180
1246276
124848

FAQ

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

LCM of 12 and 28 is 84

How to find the LCM of 12 and 28 using prime factorization?

To find the LCM of 12 and 28, find all prime factors of both numbers, then multiply the highest power of each prime factor. The result is 84.

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 12 and 28: LCM = 84, GCF = 4.

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