Least Common Multiple (LCM) of 40 and 138
The least common multiple (LCM) of 40 and 138 is 2760.
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 40 and 138?
First, calculate the GCD of 40 and 138 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 40 ÷ 138 = 0 remainder 40 |
| 2 | 138 ÷ 40 = 3 remainder 18 |
| 3 | 40 ÷ 18 = 2 remainder 4 |
| 4 | 18 ÷ 4 = 4 remainder 2 |
| 5 | 4 ÷ 2 = 2 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 188 and 20 | 940 |
| 196 and 171 | 33516 |
| 170 and 85 | 170 |
| 55 and 91 | 5005 |
| 63 and 15 | 315 |