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What is the Least Common Multiple of 1989 and 1998?

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 (LCM) of 1989 and 1998 is 441558.

LCM(1989,1998) = 441558

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Least Common Multiple of 1989 and 1998 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1989 and 1998, than apply into the LCM equation.

GCF(1989,1998) = 9
LCM(1989,1998) = ( 1989 × 1998) / 9
LCM(1989,1998) = 3974022 / 9
LCM(1989,1998) = 441558

Least Common Multiple (LCM) of 1989 and 1998 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1989 and 1998. First we will calculate the prime factors of 1989 and 1998.

Prime Factorization of 1989

Prime factors of 1989 are 3, 13, 17. Prime factorization of 1989 in exponential form is:

1989 = 32 × 131 × 171

Prime Factorization of 1998

Prime factors of 1998 are 2, 3, 37. Prime factorization of 1998 in exponential form is:

1998 = 21 × 33 × 371

Now multiplying the highest exponent prime factors to calculate the LCM of 1989 and 1998.

LCM(1989,1998) = 33 × 131 × 171 × 21 × 371
LCM(1989,1998) = 441558