Least Common Multiple (LCM) of 21 and 117
The least common multiple (LCM) of 21 and 117 is 819.
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 117?
First, calculate the GCD of 21 and 117 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 21 ÷ 117 = 0 remainder 21 |
| 2 | 117 ÷ 21 = 5 remainder 12 |
| 3 | 21 ÷ 12 = 1 remainder 9 |
| 4 | 12 ÷ 9 = 1 remainder 3 |
| 5 | 9 ÷ 3 = 3 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 167 and 59 | 9853 |
| 100 and 18 | 900 |
| 171 and 58 | 9918 |
| 68 and 199 | 13532 |
| 48 and 24 | 48 |