Greatest Common Divisor (GCD) of 198 and 121
The greatest common divisor (GCD) of 198 and 121 is 11.
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 198 and 121?
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 | 198 ÷ 121 = 1 remainder 77 |
| 2 | 121 ÷ 77 = 1 remainder 44 |
| 3 | 77 ÷ 44 = 1 remainder 33 |
| 4 | 44 ÷ 33 = 1 remainder 11 |
| 5 | 33 ÷ 11 = 3 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 58 and 84 | 2 |
| 80 and 134 | 2 |
| 97 and 80 | 1 |
| 74 and 175 | 1 |
| 19 and 91 | 1 |