Least Common Multiple (LCM) of 81 and 17
The least common multiple (LCM) of 81 and 17 is 1377.
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 17?
First, calculate the GCD of 81 and 17 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 81 ÷ 17 = 4 remainder 13 |
| 2 | 17 ÷ 13 = 1 remainder 4 |
| 3 | 13 ÷ 4 = 3 remainder 1 |
| 4 | 4 ÷ 1 = 4 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 159 and 17 | 2703 |
| 25 and 65 | 325 |
| 73 and 65 | 4745 |
| 139 and 117 | 16263 |
| 171 and 95 | 855 |