Greatest Common Divisor (GCD) of 127 and 131
The greatest common divisor (GCD) of 127 and 131 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 127 and 131?
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 | 127 ÷ 131 = 0 remainder 127 |
| 2 | 131 ÷ 127 = 1 remainder 4 |
| 3 | 127 ÷ 4 = 31 remainder 3 |
| 4 | 4 ÷ 3 = 1 remainder 1 |
| 5 | 3 ÷ 1 = 3 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 71 and 40 | 1 |
| 154 and 189 | 7 |
| 147 and 42 | 21 |
| 196 and 165 | 1 |
| 135 and 150 | 15 |