Least Common Multiple (LCM) of 81 and 155
The least common multiple (LCM) of 81 and 155 is 12555.
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 81 and 155?
First, calculate the GCD of 81 and 155 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 81 ÷ 155 = 0 remainder 81 |
| 2 | 155 ÷ 81 = 1 remainder 74 |
| 3 | 81 ÷ 74 = 1 remainder 7 |
| 4 | 74 ÷ 7 = 10 remainder 4 |
| 5 | 7 ÷ 4 = 1 remainder 3 |
| 6 | 4 ÷ 3 = 1 remainder 1 |
| 7 | 3 ÷ 1 = 3 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 87 and 38 | 3306 |
| 59 and 58 | 3422 |
| 199 and 193 | 38407 |
| 87 and 20 | 1740 |
| 74 and 106 | 3922 |