# What is the Least Common Multiple of 138 and 151?

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 138 and 151 is 20838.

LCM(138,151) = 20838

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## Least Common Multiple of 138 and 151 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 138 and 151, than apply into the LCM equation.

GCF(138,151) = 1
LCM(138,151) = ( 138 × 151) / 1
LCM(138,151) = 20838 / 1
LCM(138,151) = 20838

## Least Common Multiple (LCM) of 138 and 151 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 138 and 151. First we will calculate the prime factors of 138 and 151.

### Prime Factorization of 138

Prime factors of 138 are 2, 3, 23. Prime factorization of 138 in exponential form is:

138 = 21 × 31 × 231

### Prime Factorization of 151

Prime factors of 151 are 151. Prime factorization of 151 in exponential form is:

151 = 1511

Now multiplying the highest exponent prime factors to calculate the LCM of 138 and 151.

LCM(138,151) = 21 × 31 × 231 × 1511
LCM(138,151) = 20838