What is the Least Common Multiple of 1991 and 1995?

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 1991 and 1995 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1991 and 1995, than apply into the LCM equation.

GCF(1991,1995) = 1
LCM(1991,1995) = ( 1991 × 1995) / 1
LCM(1991,1995) = 3972045 / 1
LCM(1991,1995) = 3972045

Least Common Multiple (LCM) of 1991 and 1995 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1991 and 1995. First we will calculate the prime factors of 1991 and 1995.

Prime Factorization of 1991

Prime Factorization of 1995

Now multiplying the highest exponent prime factors to calculate the LCM of 1991 and 1995.

LCM(1991,1995) = 11¹ × 181¹ × 3¹ × 5¹ × 7¹ × 19¹
LCM(1991,1995) = 3972045