Greatest Common Divisor (GCD) of 145 and 55
The greatest common divisor (GCD) of 145 and 55 is 5.
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 145 and 55?
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 | 145 ÷ 55 = 2 remainder 35 |
| 2 | 55 ÷ 35 = 1 remainder 20 |
| 3 | 35 ÷ 20 = 1 remainder 15 |
| 4 | 20 ÷ 15 = 1 remainder 5 |
| 5 | 15 ÷ 5 = 3 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 95 and 50 | 5 |
| 122 and 94 | 2 |
| 142 and 155 | 1 |
| 37 and 19 | 1 |
| 197 and 84 | 1 |