Least Common Multiple (LCM) of 21 and 135
The least common multiple (LCM) of 21 and 135 is 945.
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 135?
First, calculate the GCD of 21 and 135 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 21 ÷ 135 = 0 remainder 21 |
| 2 | 135 ÷ 21 = 6 remainder 9 |
| 3 | 21 ÷ 9 = 2 remainder 3 |
| 4 | 9 ÷ 3 = 3 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 70 and 157 | 10990 |
| 164 and 188 | 7708 |
| 63 and 197 | 12411 |
| 126 and 147 | 882 |
| 165 and 10 | 330 |