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What is the Least Common Multiple of 1648 and 1660?

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 1648 and 1660 is 683920.

LCM(1648,1660) = 683920

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Least Common Multiple of 1648 and 1660 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1648 and 1660, than apply into the LCM equation.

GCF(1648,1660) = 4
LCM(1648,1660) = ( 1648 × 1660) / 4
LCM(1648,1660) = 2735680 / 4
LCM(1648,1660) = 683920

Least Common Multiple (LCM) of 1648 and 1660 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1648 and 1660. First we will calculate the prime factors of 1648 and 1660.

Prime Factorization of 1648

Prime factors of 1648 are 2, 103. Prime factorization of 1648 in exponential form is:

1648 = 24 × 1031

Prime Factorization of 1660

Prime factors of 1660 are 2, 5, 83. Prime factorization of 1660 in exponential form is:

1660 = 22 × 51 × 831

Now multiplying the highest exponent prime factors to calculate the LCM of 1648 and 1660.

LCM(1648,1660) = 24 × 1031 × 51 × 831
LCM(1648,1660) = 683920