Greatest Common Divisor (GCD) of 105 and 195
The greatest common divisor (GCD) of 105 and 195 is 15.
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 105 and 195?
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 | 105 ÷ 195 = 0 remainder 105 |
| 2 | 195 ÷ 105 = 1 remainder 90 |
| 3 | 105 ÷ 90 = 1 remainder 15 |
| 4 | 90 ÷ 15 = 6 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 43 and 139 | 1 |
| 133 and 167 | 1 |
| 174 and 169 | 1 |
| 66 and 144 | 6 |
| 138 and 43 | 1 |