What is the Least Common Multiple of 1940 and 1956?

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 1940 and 1956 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1940 and 1956, than apply into the LCM equation.

GCF(1940,1956) = 4
LCM(1940,1956) = ( 1940 × 1956) / 4
LCM(1940,1956) = 3794640 / 4
LCM(1940,1956) = 948660

Least Common Multiple (LCM) of 1940 and 1956 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1940 and 1956. First we will calculate the prime factors of 1940 and 1956.

Prime Factorization of 1940

Prime Factorization of 1956

Now multiplying the highest exponent prime factors to calculate the LCM of 1940 and 1956.

LCM(1940,1956) = 2² × 5¹ × 97¹ × 3¹ × 163¹
LCM(1940,1956) = 948660