Least Common Multiple (LCM) of 42 and 20
The least common multiple (LCM) of 42 and 20 is 420.
What is the Least Common Multiple (LCM)?
The LCM of two integers is the smallest positive integer that is divisible by both numbers. It is often used to find common denominators and solve problems involving periodic events.
Formula for LCM
The LCM of two numbers can be calculated using their GCD:
LCM(a, b) = |a × b| ÷ GCD(a, b)
How to Calculate the LCM of 42 and 20?
First, calculate the GCD of 42 and 20 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 42 ÷ 20 = 2 remainder 2 |
| 2 | 20 ÷ 2 = 10 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 55 and 100 | 1100 |
| 194 and 49 | 9506 |
| 121 and 91 | 11011 |
| 137 and 147 | 20139 |
| 116 and 141 | 16356 |