Least Common Multiple (LCM) of 42 and 87
The least common multiple (LCM) of 42 and 87 is 1218.
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 87?
First, calculate the GCD of 42 and 87 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 42 ÷ 87 = 0 remainder 42 |
| 2 | 87 ÷ 42 = 2 remainder 3 |
| 3 | 42 ÷ 3 = 14 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 169 and 102 | 17238 |
| 133 and 160 | 21280 |
| 11 and 59 | 649 |
| 189 and 121 | 22869 |
| 129 and 138 | 5934 |