What is the Least Common Multiple of 3408 and 3420?

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 3408 and 3420 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 3408 and 3420, than apply into the LCM equation.

GCF(3408,3420) = 12
LCM(3408,3420) = ( 3408 × 3420) / 12
LCM(3408,3420) = 11655360 / 12
LCM(3408,3420) = 971280

Least Common Multiple (LCM) of 3408 and 3420 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 3408 and 3420. First we will calculate the prime factors of 3408 and 3420.

Prime Factorization of 3408

Prime Factorization of 3420

Now multiplying the highest exponent prime factors to calculate the LCM of 3408 and 3420.

LCM(3408,3420) = 2⁴ × 3² × 71¹ × 5¹ × 19¹
LCM(3408,3420) = 971280