# What is the Least Common Multiple of 18 and 22?

Least common multiple or lowest common denominator (lcd) can be calculated in two way; with the LCM formula calculation of greatest common factor (GCF), or multiplying the prime factors with the highest exponent factor.

Least common multiple (LCM) of 18 and 22 is 198.

LCM(18,22) = 198

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## Least Common Multiple of 18 and 22 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 18 and 22, than apply into the LCM equation.

GCF(18,22) = 2
LCM(18,22) = ( 18 × 22) / 2
LCM(18,22) = 396 / 2
LCM(18,22) = 198

## Least Common Multiple (LCM) of 18 and 22 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 18 and 22. First we will calculate the prime factors of 18 and 22.

### Prime Factorization of 18

Prime factors of 18 are 2, 3. Prime factorization of 18 in exponential form is:

18 = 21 × 32

### Prime Factorization of 22

Prime factors of 22 are 2, 11. Prime factorization of 22 in exponential form is:

22 = 21 × 111

Now multiplying the highest exponent prime factors to calculate the LCM of 18 and 22.

LCM(18,22) = 21 × 32 × 111
LCM(18,22) = 198