Greatest Common Divisor (GCD) of 129 and 81
The greatest common divisor (GCD) of 129 and 81 is 3.
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 129 and 81?
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 | 129 ÷ 81 = 1 remainder 48 |
| 2 | 81 ÷ 48 = 1 remainder 33 |
| 3 | 48 ÷ 33 = 1 remainder 15 |
| 4 | 33 ÷ 15 = 2 remainder 3 |
| 5 | 15 ÷ 3 = 5 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 79 and 94 | 1 |
| 117 and 160 | 1 |
| 76 and 161 | 1 |
| 150 and 42 | 6 |
| 142 and 110 | 2 |