Least Common Multiple (LCM) of 81 and 15
The least common multiple (LCM) of 81 and 15 is 405.
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 15?
First, calculate the GCD of 81 and 15 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 81 ÷ 15 = 5 remainder 6 |
| 2 | 15 ÷ 6 = 2 remainder 3 |
| 3 | 6 ÷ 3 = 2 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 153 and 77 | 11781 |
| 147 and 129 | 6321 |
| 148 and 160 | 5920 |
| 16 and 23 | 368 |
| 181 and 175 | 31675 |