Least Common Multiple (LCM) of 87 and 138
The least common multiple (LCM) of 87 and 138 is 4002.
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 87 and 138?
First, calculate the GCD of 87 and 138 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 87 ÷ 138 = 0 remainder 87 |
| 2 | 138 ÷ 87 = 1 remainder 51 |
| 3 | 87 ÷ 51 = 1 remainder 36 |
| 4 | 51 ÷ 36 = 1 remainder 15 |
| 5 | 36 ÷ 15 = 2 remainder 6 |
| 6 | 15 ÷ 6 = 2 remainder 3 |
| 7 | 6 ÷ 3 = 2 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 173 and 14 | 2422 |
| 155 and 88 | 13640 |
| 109 and 77 | 8393 |
| 196 and 193 | 37828 |
| 192 and 48 | 192 |