What is the Least Common Multiple of 7120 and 7140?

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 7120 and 7140 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 7120 and 7140, than apply into the LCM equation.

GCF(7120,7140) = 20
LCM(7120,7140) = ( 7120 × 7140) / 20
LCM(7120,7140) = 50836800 / 20
LCM(7120,7140) = 2541840

Least Common Multiple (LCM) of 7120 and 7140 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 7120 and 7140. First we will calculate the prime factors of 7120 and 7140.

Prime Factorization of 7120

Prime Factorization of 7140

Now multiplying the highest exponent prime factors to calculate the LCM of 7120 and 7140.

LCM(7120,7140) = 2⁴ × 5¹ × 89¹ × 3¹ × 7¹ × 17¹
LCM(7120,7140) = 2541840