Least Common Multiple (LCM) of 20 and 78
The least common multiple (LCM) of 20 and 78 is 780.
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 78?
First, calculate the GCD of 20 and 78 using the Euclidean algorithm. Then use the formula above to find the LCM.
Step-by-Step GCD Calculation
| Step | Calculation |
|---|---|
| 1 | 20 ÷ 78 = 0 remainder 20 |
| 2 | 78 ÷ 20 = 3 remainder 18 |
| 3 | 20 ÷ 18 = 1 remainder 2 |
| 4 | 18 ÷ 2 = 9 remainder 0 |
Examples of LCM Calculations
| Numbers | LCM |
|---|---|
| 132 and 40 | 1320 |
| 100 and 147 | 14700 |
| 85 and 17 | 85 |
| 152 and 20 | 760 |
| 21 and 135 | 945 |