Greatest Common Divisor (GCD) of 90 and 161
The greatest common divisor (GCD) of 90 and 161 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 90 and 161?
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 | 90 ÷ 161 = 0 remainder 90 |
| 2 | 161 ÷ 90 = 1 remainder 71 |
| 3 | 90 ÷ 71 = 1 remainder 19 |
| 4 | 71 ÷ 19 = 3 remainder 14 |
| 5 | 19 ÷ 14 = 1 remainder 5 |
| 6 | 14 ÷ 5 = 2 remainder 4 |
| 7 | 5 ÷ 4 = 1 remainder 1 |
| 8 | 4 ÷ 1 = 4 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 143 and 28 | 1 |
| 194 and 115 | 1 |
| 160 and 175 | 5 |
| 121 and 167 | 1 |
| 35 and 193 | 1 |