Greatest Common Divisor (GCD) of 122 and 79
The greatest common divisor (GCD) of 122 and 79 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 122 and 79?
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 | 122 ÷ 79 = 1 remainder 43 |
| 2 | 79 ÷ 43 = 1 remainder 36 |
| 3 | 43 ÷ 36 = 1 remainder 7 |
| 4 | 36 ÷ 7 = 5 remainder 1 |
| 5 | 7 ÷ 1 = 7 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 189 and 55 | 1 |
| 42 and 57 | 3 |
| 17 and 182 | 1 |
| 104 and 195 | 13 |
| 162 and 94 | 2 |