What is the Least Common Multiple of 280 and 300?

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 280 and 300 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 280 and 300, than apply into the LCM equation.

GCF(280,300) = 20
LCM(280,300) = ( 280 × 300) / 20
LCM(280,300) = 84000 / 20
LCM(280,300) = 4200

Least Common Multiple (LCM) of 280 and 300 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 280 and 300. First we will calculate the prime factors of 280 and 300.

Prime Factorization of 280

Prime Factorization of 300

Now multiplying the highest exponent prime factors to calculate the LCM of 280 and 300.

LCM(280,300) = 2³ × 5² × 7¹ × 3¹
LCM(280,300) = 4200