Least Common Multiple (LCM) of 20 and 40
The least common multiple (LCM) of 20 and 40 is 40.
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 20 and 40?
First, calculate the GCD of 20 and 40 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 20 ÷ 40 = 0 remainder 20 |
| 2 | 40 ÷ 20 = 2 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 60 and 138 | 1380 |
| 122 and 31 | 3782 |
| 15 and 151 | 2265 |
| 58 and 165 | 9570 |
| 163 and 135 | 22005 |