# What is the Least Common Multiple of 75 and 85?

*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 75 and 85 is **1275**.

LCM(75,85) = 1275

## Least Common Multiple of 75 and 85 with GCF Formula

The formula of **LCM** is LCM(a,b) = ( a × b) / GCF(a,b).

We need to calculate greatest common factor 75 and 85, than apply into the LCM equation.

GCF(75,85) = 5

LCM(75,85) = ( 75 × 85) / 5

LCM(75,85) = 6375 / 5

LCM(75,85) = 1275

## Least Common Multiple (LCM) of 75 and 85 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 75 and 85. First we will calculate the **prime factors of 75 and 85**.

### Prime Factorization of 75

Prime factors of 75 are 3, 5. Prime factorization of **75** in exponential form is:

75 = 3^{1} × 5^{2}

### Prime Factorization of 85

Prime factors of 85 are 5, 17. Prime factorization of **85** in exponential form is:

85 = 5^{1} × 17^{1}

Now multiplying the highest exponent prime factors to calculate the **LCM of 75 and 85**.

LCM(75,85) = 3^{1} × 5^{2} × 17^{1}

LCM(75,85) = 1275