Least Common Multiple (LCM) of 81 and 72
The least common multiple (LCM) of 81 and 72 is 648.
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 72?
First, calculate the GCD of 81 and 72 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 81 ÷ 72 = 1 remainder 9 |
| 2 | 72 ÷ 9 = 8 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 125 and 57 | 7125 |
| 179 and 82 | 14678 |
| 142 and 146 | 10366 |
| 96 and 63 | 2016 |
| 52 and 51 | 2652 |