What is the Least Common Multiple of 680 and 689?

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 680 and 689 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 680 and 689, than apply into the LCM equation.

GCF(680,689) = 1
LCM(680,689) = ( 680 × 689) / 1
LCM(680,689) = 468520 / 1
LCM(680,689) = 468520

Least Common Multiple (LCM) of 680 and 689 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 680 and 689. First we will calculate the prime factors of 680 and 689.

Prime Factorization of 680

Prime Factorization of 689

Now multiplying the highest exponent prime factors to calculate the LCM of 680 and 689.

LCM(680,689) = 2³ × 5¹ × 17¹ × 13¹ × 53¹
LCM(680,689) = 468520