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What is the Least Common Multiple of 3985 and 4005?

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 3985 and 4005 is 3191985.

LCM(3985,4005) = 3191985

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Least Common Multiple of 3985 and 4005 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 3985 and 4005, than apply into the LCM equation.

GCF(3985,4005) = 5
LCM(3985,4005) = ( 3985 × 4005) / 5
LCM(3985,4005) = 15959925 / 5
LCM(3985,4005) = 3191985

Least Common Multiple (LCM) of 3985 and 4005 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 3985 and 4005. First we will calculate the prime factors of 3985 and 4005.

Prime Factorization of 3985

Prime factors of 3985 are 5, 797. Prime factorization of 3985 in exponential form is:

3985 = 51 × 7971

Prime Factorization of 4005

Prime factors of 4005 are 3, 5, 89. Prime factorization of 4005 in exponential form is:

4005 = 32 × 51 × 891

Now multiplying the highest exponent prime factors to calculate the LCM of 3985 and 4005.

LCM(3985,4005) = 51 × 7971 × 32 × 891
LCM(3985,4005) = 3191985