Greatest Common Divisor (GCD) of 61 and 80
The greatest common divisor (GCD) of 61 and 80 is 1.
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 61 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 | 61 ÷ 80 = 0 remainder 61 |
| 2 | 80 ÷ 61 = 1 remainder 19 |
| 3 | 61 ÷ 19 = 3 remainder 4 |
| 4 | 19 ÷ 4 = 4 remainder 3 |
| 5 | 4 ÷ 3 = 1 remainder 1 |
| 6 | 3 ÷ 1 = 3 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 200 and 127 | 1 |
| 143 and 189 | 1 |
| 103 and 196 | 1 |
| 45 and 46 | 1 |
| 200 and 136 | 8 |