Least Common Multiple (LCM) of 81 and 108
The least common multiple (LCM) of 81 and 108 is 324.
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 108?
First, calculate the GCD of 81 and 108 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 81 ÷ 108 = 0 remainder 81 |
| 2 | 108 ÷ 81 = 1 remainder 27 |
| 3 | 81 ÷ 27 = 3 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 171 and 21 | 1197 |
| 70 and 11 | 770 |
| 68 and 42 | 1428 |
| 138 and 163 | 22494 |
| 77 and 141 | 10857 |