What is the Least Common Multiple of 3920 and 3928?

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 3920 and 3928 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 3920 and 3928, than apply into the LCM equation.

GCF(3920,3928) = 8
LCM(3920,3928) = ( 3920 × 3928) / 8
LCM(3920,3928) = 15397760 / 8
LCM(3920,3928) = 1924720

Least Common Multiple (LCM) of 3920 and 3928 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 3920 and 3928. First we will calculate the prime factors of 3920 and 3928.

Prime Factorization of 3920

Prime Factorization of 3928

Now multiplying the highest exponent prime factors to calculate the LCM of 3920 and 3928.

LCM(3920,3928) = 2⁴ × 5¹ × 7² × 491¹
LCM(3920,3928) = 1924720