Least Common Multiple (LCM) of 21 and 177
The least common multiple (LCM) of 21 and 177 is 1239.
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 177?
First, calculate the GCD of 21 and 177 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 21 ÷ 177 = 0 remainder 21 |
| 2 | 177 ÷ 21 = 8 remainder 9 |
| 3 | 21 ÷ 9 = 2 remainder 3 |
| 4 | 9 ÷ 3 = 3 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 22 and 181 | 3982 |
| 198 and 33 | 198 |
| 125 and 42 | 5250 |
| 158 and 156 | 12324 |
| 54 and 139 | 7506 |