What is the Least Common Multiple of 780 and 784?

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 780 and 784 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 780 and 784, than apply into the LCM equation.

GCF(780,784) = 4
LCM(780,784) = ( 780 × 784) / 4
LCM(780,784) = 611520 / 4
LCM(780,784) = 152880

Least Common Multiple (LCM) of 780 and 784 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 780 and 784. First we will calculate the prime factors of 780 and 784.

Prime Factorization of 780

Prime Factorization of 784

Now multiplying the highest exponent prime factors to calculate the LCM of 780 and 784.

LCM(780,784) = 2⁴ × 3¹ × 5¹ × 13¹ × 7²
LCM(780,784) = 152880