Least Common Multiple (LCM) of 20 and 56
The least common multiple (LCM) of 20 and 56 is 280.
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 56?
First, calculate the GCD of 20 and 56 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 20 ÷ 56 = 0 remainder 20 |
| 2 | 56 ÷ 20 = 2 remainder 16 |
| 3 | 20 ÷ 16 = 1 remainder 4 |
| 4 | 16 ÷ 4 = 4 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 166 and 44 | 3652 |
| 130 and 105 | 2730 |
| 152 and 50 | 3800 |
| 120 and 100 | 600 |
| 89 and 139 | 12371 |