Least Common Multiple (LCM) of 21 and 161
The least common multiple (LCM) of 21 and 161 is 483.
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 161?
First, calculate the GCD of 21 and 161 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 21 ÷ 161 = 0 remainder 21 |
| 2 | 161 ÷ 21 = 7 remainder 14 |
| 3 | 21 ÷ 14 = 1 remainder 7 |
| 4 | 14 ÷ 7 = 2 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 80 and 55 | 880 |
| 159 and 161 | 25599 |
| 190 and 110 | 2090 |
| 77 and 11 | 77 |
| 58 and 60 | 1740 |