Least Common Multiple (LCM) of 43 and 81
The least common multiple (LCM) of 43 and 81 is 3483.
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 43 and 81?
First, calculate the GCD of 43 and 81 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 43 ÷ 81 = 0 remainder 43 |
| 2 | 81 ÷ 43 = 1 remainder 38 |
| 3 | 43 ÷ 38 = 1 remainder 5 |
| 4 | 38 ÷ 5 = 7 remainder 3 |
| 5 | 5 ÷ 3 = 1 remainder 2 |
| 6 | 3 ÷ 2 = 1 remainder 1 |
| 7 | 2 ÷ 1 = 2 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 74 and 87 | 6438 |
| 119 and 104 | 12376 |
| 76 and 118 | 4484 |
| 189 and 175 | 4725 |
| 111 and 87 | 3219 |