Least Common Multiple (LCM) of 105 and 84
The least common multiple (LCM) of 105 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 105 and 84?
First, calculate the GCD of 105 and 84 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 105 ÷ 84 = 1 remainder 21 |
| 2 | 84 ÷ 21 = 4 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 86 and 80 | 3440 |
| 38 and 155 | 5890 |
| 120 and 55 | 1320 |
| 170 and 165 | 5610 |
| 81 and 108 | 324 |