Greatest Common Divisor (GCD) of 155 and 124
The greatest common divisor (GCD) of 155 and 124 is 31.
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 155 and 124?
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 | 155 ÷ 124 = 1 remainder 31 |
| 2 | 124 ÷ 31 = 4 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 131 and 114 | 1 |
| 171 and 20 | 1 |
| 116 and 178 | 2 |
| 123 and 24 | 3 |
| 82 and 66 | 2 |