Greatest Common Divisor (GCD) of 55 and 153
The greatest common divisor (GCD) of 55 and 153 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 55 and 153?
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 | 55 ÷ 153 = 0 remainder 55 |
| 2 | 153 ÷ 55 = 2 remainder 43 |
| 3 | 55 ÷ 43 = 1 remainder 12 |
| 4 | 43 ÷ 12 = 3 remainder 7 |
| 5 | 12 ÷ 7 = 1 remainder 5 |
| 6 | 7 ÷ 5 = 1 remainder 2 |
| 7 | 5 ÷ 2 = 2 remainder 1 |
| 8 | 2 ÷ 1 = 2 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 133 and 171 | 19 |
| 79 and 23 | 1 |
| 163 and 121 | 1 |
| 57 and 68 | 1 |
| 106 and 186 | 2 |