Least Common Multiple (LCM) of 21 and 198
The least common multiple (LCM) of 21 and 198 is 1386.
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 21 and 198?
First, calculate the GCD of 21 and 198 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 21 ÷ 198 = 0 remainder 21 |
| 2 | 198 ÷ 21 = 9 remainder 9 |
| 3 | 21 ÷ 9 = 2 remainder 3 |
| 4 | 9 ÷ 3 = 3 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 13 and 199 | 2587 |
| 131 and 126 | 16506 |
| 20 and 150 | 300 |
| 120 and 83 | 9960 |
| 105 and 17 | 1785 |