What is the Least Common Multiple of 1640 and 1660?

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 1640 and 1660 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1640 and 1660, than apply into the LCM equation.

GCF(1640,1660) = 20
LCM(1640,1660) = ( 1640 × 1660) / 20
LCM(1640,1660) = 2722400 / 20
LCM(1640,1660) = 136120

Least Common Multiple (LCM) of 1640 and 1660 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1640 and 1660. First we will calculate the prime factors of 1640 and 1660.

Prime Factorization of 1640

Prime Factorization of 1660

Now multiplying the highest exponent prime factors to calculate the LCM of 1640 and 1660.

LCM(1640,1660) = 2³ × 5¹ × 41¹ × 83¹
LCM(1640,1660) = 136120