Least Common Multiple (LCM) of 39 and 31
The least common multiple (LCM) of 39 and 31 is 1209.
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 39 and 31?
First, calculate the GCD of 39 and 31 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 39 ÷ 31 = 1 remainder 8 |
| 2 | 31 ÷ 8 = 3 remainder 7 |
| 3 | 8 ÷ 7 = 1 remainder 1 |
| 4 | 7 ÷ 1 = 7 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 47 and 200 | 9400 |
| 80 and 70 | 560 |
| 19 and 94 | 1786 |
| 19 and 109 | 2071 |
| 19 and 15 | 285 |