Least Common Multiple (LCM) of 20 and 115
The least common multiple (LCM) of 20 and 115 is 460.
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 20 and 115?
First, calculate the GCD of 20 and 115 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 20 ÷ 115 = 0 remainder 20 |
| 2 | 115 ÷ 20 = 5 remainder 15 |
| 3 | 20 ÷ 15 = 1 remainder 5 |
| 4 | 15 ÷ 5 = 3 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 75 and 81 | 2025 |
| 120 and 155 | 3720 |
| 122 and 147 | 17934 |
| 101 and 75 | 7575 |
| 175 and 152 | 26600 |