Greatest Common Divisor (GCD) of 66 and 195
The greatest common divisor (GCD) of 66 and 195 is 3.
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 66 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 | 66 ÷ 195 = 0 remainder 66 |
| 2 | 195 ÷ 66 = 2 remainder 63 |
| 3 | 66 ÷ 63 = 1 remainder 3 |
| 4 | 63 ÷ 3 = 21 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 170 and 108 | 2 |
| 35 and 162 | 1 |
| 185 and 139 | 1 |
| 148 and 13 | 1 |
| 111 and 102 | 3 |