Least Common Multiple (LCM) of 21 and 171
The least common multiple (LCM) of 21 and 171 is 1197.
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 171?
First, calculate the GCD of 21 and 171 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 21 ÷ 171 = 0 remainder 21 |
| 2 | 171 ÷ 21 = 8 remainder 3 |
| 3 | 21 ÷ 3 = 7 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 127 and 154 | 19558 |
| 46 and 73 | 3358 |
| 79 and 17 | 1343 |
| 120 and 175 | 4200 |
| 107 and 198 | 21186 |