Greatest Common Divisor (GCD) of 56 and 91
The greatest common divisor (GCD) of 56 and 91 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 56 and 91?
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 | 56 ÷ 91 = 0 remainder 56 |
| 2 | 91 ÷ 56 = 1 remainder 35 |
| 3 | 56 ÷ 35 = 1 remainder 21 |
| 4 | 35 ÷ 21 = 1 remainder 14 |
| 5 | 21 ÷ 14 = 1 remainder 7 |
| 6 | 14 ÷ 7 = 2 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 78 and 54 | 6 |
| 55 and 192 | 1 |
| 69 and 169 | 1 |
| 172 and 190 | 2 |
| 19 and 30 | 1 |