# What is the Least Common Multiple of 122 and 138?

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 122 and 138 is 8418.

LCM(122,138) = 8418

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## Least Common Multiple of 122 and 138 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 122 and 138, than apply into the LCM equation.

GCF(122,138) = 2
LCM(122,138) = ( 122 × 138) / 2
LCM(122,138) = 16836 / 2
LCM(122,138) = 8418

## Least Common Multiple (LCM) of 122 and 138 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 122 and 138. First we will calculate the prime factors of 122 and 138.

### Prime Factorization of 122

Prime factors of 122 are 2, 61. Prime factorization of 122 in exponential form is:

122 = 21 × 611

### Prime Factorization of 138

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

138 = 21 × 31 × 231

Now multiplying the highest exponent prime factors to calculate the LCM of 122 and 138.

LCM(122,138) = 21 × 611 × 31 × 231
LCM(122,138) = 8418