Greatest Common Divisor (GCD) of 128 and 173
The greatest common divisor (GCD) of 128 and 173 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 128 and 173?
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 ÷ 173 = 0 remainder 128 |
| 2 | 173 ÷ 128 = 1 remainder 45 |
| 3 | 128 ÷ 45 = 2 remainder 38 |
| 4 | 45 ÷ 38 = 1 remainder 7 |
| 5 | 38 ÷ 7 = 5 remainder 3 |
| 6 | 7 ÷ 3 = 2 remainder 1 |
| 7 | 3 ÷ 1 = 3 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 166 and 56 | 2 |
| 117 and 129 | 3 |
| 190 and 47 | 1 |
| 83 and 82 | 1 |
| 77 and 197 | 1 |