Least Common Multiple (LCM) of 20 and 45
The least common multiple (LCM) of 20 and 45 is 180.
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 45?
First, calculate the GCD of 20 and 45 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 20 ÷ 45 = 0 remainder 20 |
| 2 | 45 ÷ 20 = 2 remainder 5 |
| 3 | 20 ÷ 5 = 4 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 79 and 156 | 12324 |
| 192 and 149 | 28608 |
| 69 and 70 | 4830 |
| 100 and 133 | 13300 |
| 89 and 111 | 9879 |