Least Common Multiple (LCM) of 123 and 155
The least common multiple (LCM) of 123 and 155 is 19065.
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 155?
First, calculate the GCD of 123 and 155 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 123 ÷ 155 = 0 remainder 123 |
| 2 | 155 ÷ 123 = 1 remainder 32 |
| 3 | 123 ÷ 32 = 3 remainder 27 |
| 4 | 32 ÷ 27 = 1 remainder 5 |
| 5 | 27 ÷ 5 = 5 remainder 2 |
| 6 | 5 ÷ 2 = 2 remainder 1 |
| 7 | 2 ÷ 1 = 2 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 29 and 128 | 3712 |
| 14 and 143 | 2002 |
| 173 and 79 | 13667 |
| 15 and 145 | 435 |
| 102 and 138 | 2346 |