What is the Least Common Multiple of 7760 and 7780?

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 7760 and 7780 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 7760 and 7780, than apply into the LCM equation.

GCF(7760,7780) = 20
LCM(7760,7780) = ( 7760 × 7780) / 20
LCM(7760,7780) = 60372800 / 20
LCM(7760,7780) = 3018640

Least Common Multiple (LCM) of 7760 and 7780 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 7760 and 7780. First we will calculate the prime factors of 7760 and 7780.

Prime Factorization of 7760

Prime Factorization of 7780

Now multiplying the highest exponent prime factors to calculate the LCM of 7760 and 7780.

LCM(7760,7780) = 2⁴ × 5¹ × 97¹ × 389¹
LCM(7760,7780) = 3018640