What is the Least Common Multiple of 3980 and 4000?

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 3980 and 4000 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 3980 and 4000, than apply into the LCM equation.

GCF(3980,4000) = 20
LCM(3980,4000) = ( 3980 × 4000) / 20
LCM(3980,4000) = 15920000 / 20
LCM(3980,4000) = 796000

Least Common Multiple (LCM) of 3980 and 4000 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 3980 and 4000. First we will calculate the prime factors of 3980 and 4000.

Prime Factorization of 3980

Prime Factorization of 4000

Now multiplying the highest exponent prime factors to calculate the LCM of 3980 and 4000.

LCM(3980,4000) = 2⁵ × 5³ × 199¹
LCM(3980,4000) = 796000