Least Common Multiple of 20, 42, 15, 168

Least common multiple or lowest common denominator (lcd) can be calculated in three ways

• Least Common Multiple of 20, 42, 15, 168 by common division method
• Least Common Multiple of 20, 42, 15, 168 with GCF Formula

∴ So the LCM of the given numbers is 2 x 2 x 3 x 5 x 7 x 1 x 1 x 1 x 2 = 840

The formula of LCM is LCM(a₁,a₂,a₃....,a_n) = ( a₁ × a₂ × a₃ × .... × a_n) / GCF(a₁,a₂,a₃....,a_n) x common factors(if more than 2 numbers have common factors).

We need to calculate greatest common factor of 20,42,15,168 and common factors if more than two numbers have common factor, than apply into the LCM equation.

GCF(20,42,15,168) = 1

common factors(in case of two or more numbers have common factors) = 2520

GCF(20,42,15,168) x common factors =1 x 2520 = 2520

LCM(20,42,15,168) = ( 20 × 42 × 15 × 168 ) / 2520

LCM(20,42,15,168) = 2116800 / 2520

LCM(20,42,15,168) = 840

∴ Least Common Multiple of 20,42,15,168 is 840

Here are some samples of LCM of two or more Numbers calculations.

• LCM of 25, 24, 11, 159
• LCM of 66, 10, 35, 335
• LCM of 98, 93, 77, 781
• LCM of 65, 23, 45, 430
• LCM of 48, 66, 68, 222

1. What is the LCM of 20, 42, 15, 168?

Answer: LCM of 20, 42, 15, 168 is 840.

2. What are the Factors of 840?

Answer: Factors of 840 are . There are integers that are factors of 840

3. How to Find the LCM of 20, 42, 15, 168 ?

Least Common Multiple of 20, 42, 15, 168.

Step 1: Divide all the numbers with common prime numbers having remainder zero.

Step 2: Then multiply all the prime factors with last row quotient of common division that is LCM(20, 42, 15, 168) = 2 x 2 x 2 x 3 x 5 x 7 = 840.