Greatest Common Divisor (GCD) of 77 and 139
The greatest common divisor (GCD) of 77 and 139 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 77 and 139?
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 | 77 ÷ 139 = 0 remainder 77 |
| 2 | 139 ÷ 77 = 1 remainder 62 |
| 3 | 77 ÷ 62 = 1 remainder 15 |
| 4 | 62 ÷ 15 = 4 remainder 2 |
| 5 | 15 ÷ 2 = 7 remainder 1 |
| 6 | 2 ÷ 1 = 2 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 165 and 84 | 3 |
| 59 and 147 | 1 |
| 59 and 151 | 1 |
| 159 and 161 | 1 |
| 133 and 132 | 1 |