What is the Least Common Multiple of 658 and 670?

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 658 and 670 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 658 and 670, than apply into the LCM equation.

GCF(658,670) = 2
LCM(658,670) = ( 658 × 670) / 2
LCM(658,670) = 440860 / 2
LCM(658,670) = 220430

Least Common Multiple (LCM) of 658 and 670 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 658 and 670. First we will calculate the prime factors of 658 and 670.

Prime Factorization of 658

Prime Factorization of 670

Now multiplying the highest exponent prime factors to calculate the LCM of 658 and 670.

LCM(658,670) = 2¹ × 7¹ × 47¹ × 5¹ × 67¹
LCM(658,670) = 220430