Least Common Multiple (LCM) of 21 and 38
The least common multiple (LCM) of 21 and 38 is 798.
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 38?
First, calculate the GCD of 21 and 38 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 21 ÷ 38 = 0 remainder 21 |
| 2 | 38 ÷ 21 = 1 remainder 17 |
| 3 | 21 ÷ 17 = 1 remainder 4 |
| 4 | 17 ÷ 4 = 4 remainder 1 |
| 5 | 4 ÷ 1 = 4 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 111 and 34 | 3774 |
| 120 and 170 | 2040 |
| 123 and 42 | 1722 |
| 34 and 196 | 3332 |
| 144 and 12 | 144 |