What is the Least Common Multiple of 1580 and 1600?

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 1580 and 1600 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1580 and 1600, than apply into the LCM equation.

GCF(1580,1600) = 20
LCM(1580,1600) = ( 1580 × 1600) / 20
LCM(1580,1600) = 2528000 / 20
LCM(1580,1600) = 126400

Least Common Multiple (LCM) of 1580 and 1600 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1580 and 1600. First we will calculate the prime factors of 1580 and 1600.

Prime Factorization of 1580

Prime Factorization of 1600

Now multiplying the highest exponent prime factors to calculate the LCM of 1580 and 1600.

LCM(1580,1600) = 2⁶ × 5² × 79¹
LCM(1580,1600) = 126400