What is the Least Common Multiple of 7715 and 7720?

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 of 7715 and 7720 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 7715 and 7720, than apply into the LCM equation.

GCF(7715,7720) = 5
LCM(7715,7720) = ( 7715 × 7720) / 5
LCM(7715,7720) = 59559800 / 5
LCM(7715,7720) = 11911960

Least Common Multiple (LCM) of 7715 and 7720 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 7715 and 7720. First we will calculate the prime factors of 7715 and 7720.

Prime Factorization of 7715

Prime Factorization of 7720

Now multiplying the highest exponent prime factors to calculate the LCM of 7715 and 7720.

LCM(7715,7720) = 5¹ × 1543¹ × 2³ × 193¹
LCM(7715,7720) = 11911960