Least Common Multiple (LCM) of 20 and 84
The least common multiple (LCM) of 20 and 84 is 420.
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 84?
First, calculate the GCD of 20 and 84 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 20 ÷ 84 = 0 remainder 20 |
| 2 | 84 ÷ 20 = 4 remainder 4 |
| 3 | 20 ÷ 4 = 5 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 127 and 35 | 4445 |
| 109 and 121 | 13189 |
| 100 and 11 | 1100 |
| 198 and 23 | 4554 |
| 104 and 82 | 4264 |