Least Common Multiple (LCM) of 90 and 138
The least common multiple (LCM) of 90 and 138 is 2070.
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 90 and 138?
First, calculate the GCD of 90 and 138 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 90 ÷ 138 = 0 remainder 90 |
| 2 | 138 ÷ 90 = 1 remainder 48 |
| 3 | 90 ÷ 48 = 1 remainder 42 |
| 4 | 48 ÷ 42 = 1 remainder 6 |
| 5 | 42 ÷ 6 = 7 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 87 and 65 | 5655 |
| 178 and 105 | 18690 |
| 25 and 126 | 3150 |
| 146 and 51 | 7446 |
| 29 and 51 | 1479 |