Least Common Multiple (LCM) of 109 and 21
The least common multiple (LCM) of 109 and 21 is 2289.
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 109 and 21?
First, calculate the GCD of 109 and 21 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 109 ÷ 21 = 5 remainder 4 |
| 2 | 21 ÷ 4 = 5 remainder 1 |
| 3 | 4 ÷ 1 = 4 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 37 and 138 | 5106 |
| 146 and 128 | 9344 |
| 48 and 49 | 2352 |
| 106 and 136 | 7208 |
| 100 and 98 | 4900 |