# What is the Least Common Multiple of 155 and 168?

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 155 and 168 is 26040.

LCM(155,168) = 26040

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## Least Common Multiple of 155 and 168 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 155 and 168, than apply into the LCM equation.

GCF(155,168) = 1
LCM(155,168) = ( 155 × 168) / 1
LCM(155,168) = 26040 / 1
LCM(155,168) = 26040

## Least Common Multiple (LCM) of 155 and 168 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 155 and 168. First we will calculate the prime factors of 155 and 168.

### Prime Factorization of 155

Prime factors of 155 are 5, 31. Prime factorization of 155 in exponential form is:

155 = 51 × 311

### Prime Factorization of 168

Prime factors of 168 are 2, 3, 7. Prime factorization of 168 in exponential form is:

168 = 23 × 31 × 71

Now multiplying the highest exponent prime factors to calculate the LCM of 155 and 168.

LCM(155,168) = 51 × 311 × 23 × 31 × 71
LCM(155,168) = 26040