Greatest Common Divisor (GCD) of 128 and 164
The greatest common divisor (GCD) of 128 and 164 is 4.
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 164?
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 ÷ 164 = 0 remainder 128 |
| 2 | 164 ÷ 128 = 1 remainder 36 |
| 3 | 128 ÷ 36 = 3 remainder 20 |
| 4 | 36 ÷ 20 = 1 remainder 16 |
| 5 | 20 ÷ 16 = 1 remainder 4 |
| 6 | 16 ÷ 4 = 4 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 68 and 88 | 4 |
| 88 and 22 | 22 |
| 129 and 18 | 3 |
| 33 and 155 | 1 |
| 24 and 96 | 24 |