Least Common Multiple (LCM) of 21 and 95
The least common multiple (LCM) of 21 and 95 is 1995.
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 95?
First, calculate the GCD of 21 and 95 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 21 ÷ 95 = 0 remainder 21 |
| 2 | 95 ÷ 21 = 4 remainder 11 |
| 3 | 21 ÷ 11 = 1 remainder 10 |
| 4 | 11 ÷ 10 = 1 remainder 1 |
| 5 | 10 ÷ 1 = 10 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 81 and 151 | 12231 |
| 29 and 55 | 1595 |
| 111 and 51 | 1887 |
| 105 and 198 | 6930 |
| 145 and 87 | 435 |