Greatest Common Divisor (GCD) of 171 and 27
The greatest common divisor (GCD) of 171 and 27 is 9.
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 171 and 27?
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 | 171 ÷ 27 = 6 remainder 9 |
| 2 | 27 ÷ 9 = 3 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 50 and 109 | 1 |
| 119 and 145 | 1 |
| 188 and 130 | 2 |
| 178 and 116 | 2 |
| 163 and 175 | 1 |