What is the Least Common Multiple of 1680 and 1687?

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 1680 and 1687 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1680 and 1687, than apply into the LCM equation.

GCF(1680,1687) = 7
LCM(1680,1687) = ( 1680 × 1687) / 7
LCM(1680,1687) = 2834160 / 7
LCM(1680,1687) = 404880

Least Common Multiple (LCM) of 1680 and 1687 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1680 and 1687. First we will calculate the prime factors of 1680 and 1687.

Prime Factorization of 1680

Prime Factorization of 1687

Now multiplying the highest exponent prime factors to calculate the LCM of 1680 and 1687.

LCM(1680,1687) = 2⁴ × 3¹ × 5¹ × 7¹ × 241¹
LCM(1680,1687) = 404880