Greatest Common Divisor (GCD) of 28 and 77
The greatest common divisor (GCD) of 28 and 77 is 7.
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 28 and 77?
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 | 28 ÷ 77 = 0 remainder 28 |
| 2 | 77 ÷ 28 = 2 remainder 21 |
| 3 | 28 ÷ 21 = 1 remainder 7 |
| 4 | 21 ÷ 7 = 3 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 23 and 117 | 1 |
| 62 and 69 | 1 |
| 132 and 98 | 2 |
| 154 and 68 | 2 |
| 124 and 188 | 4 |