Least Common Multiple (LCM) of 84 and 20
The least common multiple (LCM) of 84 and 20 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 84 and 20?
First, calculate the GCD of 84 and 20 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 84 ÷ 20 = 4 remainder 4 |
| 2 | 20 ÷ 4 = 5 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 101 and 167 | 16867 |
| 109 and 58 | 6322 |
| 170 and 17 | 170 |
| 103 and 84 | 8652 |
| 11 and 58 | 638 |