Least Common Multiple (LCM) of 123 and 138
The least common multiple (LCM) of 123 and 138 is 5658.
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 123 and 138?
First, calculate the GCD of 123 and 138 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 123 ÷ 138 = 0 remainder 123 |
| 2 | 138 ÷ 123 = 1 remainder 15 |
| 3 | 123 ÷ 15 = 8 remainder 3 |
| 4 | 15 ÷ 3 = 5 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 80 and 143 | 11440 |
| 18 and 106 | 954 |
| 39 and 11 | 429 |
| 122 and 11 | 1342 |
| 128 and 155 | 19840 |