Least Common Multiple (LCM) of 81 and 13
The least common multiple (LCM) of 81 and 13 is 1053.
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 13?
First, calculate the GCD of 81 and 13 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 81 ÷ 13 = 6 remainder 3 |
| 2 | 13 ÷ 3 = 4 remainder 1 |
| 3 | 3 ÷ 1 = 3 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 171 and 91 | 15561 |
| 138 and 21 | 966 |
| 57 and 25 | 1425 |
| 51 and 102 | 102 |
| 165 and 22 | 330 |