Greatest Common Divisor (GCD) of 20 and 80
The greatest common divisor (GCD) of 20 and 80 is 20.
What is the Greatest Common Divisor (GCD)?
The GCD of two integers is the largest positive integer that divides both numbers without leaving a remainder. It is useful in simplifying fractions, finding common factors, and in number theory.
How to Calculate the GCD of 20 and 80?
We use the Euclidean algorithm, which involves the following steps:
- Divide the larger number by the smaller number.
- Replace the larger number with the smaller number and the smaller number with the remainder from the division.
- Repeat this process until the remainder is zero.
- The non-zero remainder just before zero is the GCD.
Step-by-Step Euclidean Algorithm
| Step | Calculation |
|---|---|
| 1 | 20 ÷ 80 = 0 remainder 20 |
| 2 | 80 ÷ 20 = 4 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 115 and 119 | 1 |
| 19 and 54 | 1 |
| 81 and 118 | 1 |
| 177 and 166 | 1 |
| 158 and 50 | 2 |