# What is the Least Common Multiple of 56 and 65?

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 56 and 65 is 3640.

LCM(56,65) = 3640

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## Least Common Multiple of 56 and 65 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 56 and 65, than apply into the LCM equation.

GCF(56,65) = 1
LCM(56,65) = ( 56 × 65) / 1
LCM(56,65) = 3640 / 1
LCM(56,65) = 3640

## Least Common Multiple (LCM) of 56 and 65 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 56 and 65. First we will calculate the prime factors of 56 and 65.

### Prime Factorization of 56

Prime factors of 56 are 2, 7. Prime factorization of 56 in exponential form is:

56 = 23 × 71

### Prime Factorization of 65

Prime factors of 65 are 5, 13. Prime factorization of 65 in exponential form is:

65 = 51 × 131

Now multiplying the highest exponent prime factors to calculate the LCM of 56 and 65.

LCM(56,65) = 23 × 71 × 51 × 131
LCM(56,65) = 3640