What is the Least Common Multiple of 7800 and 7815?

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 7800 and 7815 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 7800 and 7815, than apply into the LCM equation.

GCF(7800,7815) = 15
LCM(7800,7815) = ( 7800 × 7815) / 15
LCM(7800,7815) = 60957000 / 15
LCM(7800,7815) = 4063800

Least Common Multiple (LCM) of 7800 and 7815 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 7800 and 7815. First we will calculate the prime factors of 7800 and 7815.

Prime Factorization of 7800

Prime Factorization of 7815

Now multiplying the highest exponent prime factors to calculate the LCM of 7800 and 7815.

LCM(7800,7815) = 2³ × 3¹ × 5² × 13¹ × 521¹
LCM(7800,7815) = 4063800