Least Common Multiple (LCM) of 45 and 81
The least common multiple (LCM) of 45 and 81 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 45 and 81?
First, calculate the GCD of 45 and 81 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 45 ÷ 81 = 0 remainder 45 |
| 2 | 81 ÷ 45 = 1 remainder 36 |
| 3 | 45 ÷ 36 = 1 remainder 9 |
| 4 | 36 ÷ 9 = 4 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 47 and 69 | 3243 |
| 140 and 191 | 26740 |
| 192 and 125 | 24000 |
| 154 and 189 | 4158 |
| 54 and 151 | 8154 |