Greatest Common Divisor (GCD) of 121 and 195
The greatest common divisor (GCD) of 121 and 195 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 121 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 | 121 ÷ 195 = 0 remainder 121 |
| 2 | 195 ÷ 121 = 1 remainder 74 |
| 3 | 121 ÷ 74 = 1 remainder 47 |
| 4 | 74 ÷ 47 = 1 remainder 27 |
| 5 | 47 ÷ 27 = 1 remainder 20 |
| 6 | 27 ÷ 20 = 1 remainder 7 |
| 7 | 20 ÷ 7 = 2 remainder 6 |
| 8 | 7 ÷ 6 = 1 remainder 1 |
| 9 | 6 ÷ 1 = 6 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 112 and 76 | 4 |
| 42 and 74 | 2 |
| 123 and 92 | 1 |
| 141 and 123 | 3 |
| 115 and 109 | 1 |