Greatest Common Divisor (GCD) of 85 and 168
The greatest common divisor (GCD) of 85 and 168 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 85 and 168?
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 | 85 ÷ 168 = 0 remainder 85 |
| 2 | 168 ÷ 85 = 1 remainder 83 |
| 3 | 85 ÷ 83 = 1 remainder 2 |
| 4 | 83 ÷ 2 = 41 remainder 1 |
| 5 | 2 ÷ 1 = 2 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 180 and 90 | 90 |
| 29 and 114 | 1 |
| 147 and 163 | 1 |
| 140 and 112 | 28 |
| 17 and 173 | 1 |