Greatest Common Divisor (GCD) of 99 and 155
The greatest common divisor (GCD) of 99 and 155 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 99 and 155?
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 | 99 ÷ 155 = 0 remainder 99 |
| 2 | 155 ÷ 99 = 1 remainder 56 |
| 3 | 99 ÷ 56 = 1 remainder 43 |
| 4 | 56 ÷ 43 = 1 remainder 13 |
| 5 | 43 ÷ 13 = 3 remainder 4 |
| 6 | 13 ÷ 4 = 3 remainder 1 |
| 7 | 4 ÷ 1 = 4 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 115 and 97 | 1 |
| 111 and 89 | 1 |
| 96 and 110 | 2 |
| 121 and 30 | 1 |
| 171 and 182 | 1 |