Least Common Multiple (LCM) of 42 and 84
The least common multiple (LCM) of 42 and 84 is 84.
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 42 and 84?
First, calculate the GCD of 42 and 84 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 42 ÷ 84 = 0 remainder 42 |
| 2 | 84 ÷ 42 = 2 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 123 and 142 | 17466 |
| 66 and 137 | 9042 |
| 134 and 156 | 10452 |
| 118 and 151 | 17818 |
| 40 and 42 | 840 |