Least Common Multiple (LCM) of 81 and 80
The least common multiple (LCM) of 81 and 80 is 6480.
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 80?
First, calculate the GCD of 81 and 80 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 81 ÷ 80 = 1 remainder 1 |
| 2 | 80 ÷ 1 = 80 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 40 and 162 | 3240 |
| 197 and 161 | 31717 |
| 139 and 163 | 22657 |
| 16 and 152 | 304 |
| 171 and 20 | 3420 |