Least Common Multiple (LCM) of 20 and 155
The least common multiple (LCM) of 20 and 155 is 620.
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 155?
First, calculate the GCD of 20 and 155 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 20 ÷ 155 = 0 remainder 20 |
| 2 | 155 ÷ 20 = 7 remainder 15 |
| 3 | 20 ÷ 15 = 1 remainder 5 |
| 4 | 15 ÷ 5 = 3 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 142 and 121 | 17182 |
| 58 and 174 | 174 |
| 84 and 110 | 4620 |
| 54 and 160 | 4320 |
| 13 and 37 | 481 |