Greatest Common Divisor (GCD) of 128 and 198
The greatest common divisor (GCD) of 128 and 198 is 2.
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 128 and 198?
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 | 128 ÷ 198 = 0 remainder 128 |
| 2 | 198 ÷ 128 = 1 remainder 70 |
| 3 | 128 ÷ 70 = 1 remainder 58 |
| 4 | 70 ÷ 58 = 1 remainder 12 |
| 5 | 58 ÷ 12 = 4 remainder 10 |
| 6 | 12 ÷ 10 = 1 remainder 2 |
| 7 | 10 ÷ 2 = 5 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 196 and 83 | 1 |
| 169 and 129 | 1 |
| 162 and 101 | 1 |
| 192 and 97 | 1 |
| 124 and 144 | 4 |