Least Common Multiple (LCM) of 21 and 125
The least common multiple (LCM) of 21 and 125 is 2625.
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 125?
First, calculate the GCD of 21 and 125 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 21 ÷ 125 = 0 remainder 21 |
| 2 | 125 ÷ 21 = 5 remainder 20 |
| 3 | 21 ÷ 20 = 1 remainder 1 |
| 4 | 20 ÷ 1 = 20 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 125 and 28 | 3500 |
| 187 and 30 | 5610 |
| 163 and 154 | 25102 |
| 30 and 178 | 2670 |
| 73 and 177 | 12921 |