Least Common Multiple (LCM) of 128 and 21
The least common multiple (LCM) of 128 and 21 is 2688.
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 128 and 21?
First, calculate the GCD of 128 and 21 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 128 ÷ 21 = 6 remainder 2 |
| 2 | 21 ÷ 2 = 10 remainder 1 |
| 3 | 2 ÷ 1 = 2 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 122 and 29 | 3538 |
| 86 and 25 | 2150 |
| 80 and 175 | 2800 |
| 181 and 152 | 27512 |
| 59 and 80 | 4720 |