Greatest Common Divisor (GCD) of 189 and 125
The greatest common divisor (GCD) of 189 and 125 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 189 and 125?
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 | 189 ÷ 125 = 1 remainder 64 |
| 2 | 125 ÷ 64 = 1 remainder 61 |
| 3 | 64 ÷ 61 = 1 remainder 3 |
| 4 | 61 ÷ 3 = 20 remainder 1 |
| 5 | 3 ÷ 1 = 3 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 76 and 52 | 4 |
| 153 and 52 | 1 |
| 128 and 122 | 2 |
| 126 and 113 | 1 |
| 162 and 77 | 1 |