What is the Least Common Multiple of 68 and 81?
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 68 and 81 is 5508.
LCM(68,81) = 5508
Least Common Multiple of 68 and 81 with GCF Formula
The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 68 and 81, than apply into the LCM equation.
GCF(68,81) = 1
LCM(68,81) = ( 68 × 81) / 1
LCM(68,81) = 5508 / 1
LCM(68,81) = 5508
Least Common Multiple (LCM) of 68 and 81 with Primes
Least common multiple can be found by multiplying the highest exponent prime factors of 68 and 81. First we will calculate the prime factors of 68 and 81.
Prime Factorization of 68
Prime factors of 68 are 2, 17. Prime factorization of 68 in exponential form is:
68 = 22 × 171
Prime Factorization of 81
Prime factors of 81 are 3. Prime factorization of 81 in exponential form is:
81 = 34
Now multiplying the highest exponent prime factors to calculate the LCM of 68 and 81.
LCM(68,81) = 22 × 171 × 34
LCM(68,81) = 5508