Greatest Common Divisor (GCD) of 166 and 197
The greatest common divisor (GCD) of 166 and 197 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 166 and 197?
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 | 166 ÷ 197 = 0 remainder 166 |
| 2 | 197 ÷ 166 = 1 remainder 31 |
| 3 | 166 ÷ 31 = 5 remainder 11 |
| 4 | 31 ÷ 11 = 2 remainder 9 |
| 5 | 11 ÷ 9 = 1 remainder 2 |
| 6 | 9 ÷ 2 = 4 remainder 1 |
| 7 | 2 ÷ 1 = 2 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 155 and 66 | 1 |
| 159 and 31 | 1 |
| 163 and 177 | 1 |
| 74 and 38 | 2 |
| 54 and 127 | 1 |