Least Common Multiple (LCM) of 42 and 28
The least common multiple (LCM) of 42 and 28 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 28?
First, calculate the GCD of 42 and 28 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 42 ÷ 28 = 1 remainder 14 |
| 2 | 28 ÷ 14 = 2 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 74 and 78 | 2886 |
| 89 and 53 | 4717 |
| 91 and 59 | 5369 |
| 181 and 27 | 4887 |
| 172 and 125 | 21500 |