Least Common Multiple (LCM) of 20 and 47
The least common multiple (LCM) of 20 and 47 is 940.
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 20 and 47?
First, calculate the GCD of 20 and 47 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 20 ÷ 47 = 0 remainder 20 |
| 2 | 47 ÷ 20 = 2 remainder 7 |
| 3 | 20 ÷ 7 = 2 remainder 6 |
| 4 | 7 ÷ 6 = 1 remainder 1 |
| 5 | 6 ÷ 1 = 6 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 70 and 70 | 70 |
| 159 and 200 | 31800 |
| 180 and 58 | 5220 |
| 170 and 60 | 1020 |
| 161 and 40 | 6440 |