Greatest Common Divisor (GCD) of 121 and 166
The greatest common divisor (GCD) of 121 and 166 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 121 and 166?
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 | 121 ÷ 166 = 0 remainder 121 |
| 2 | 166 ÷ 121 = 1 remainder 45 |
| 3 | 121 ÷ 45 = 2 remainder 31 |
| 4 | 45 ÷ 31 = 1 remainder 14 |
| 5 | 31 ÷ 14 = 2 remainder 3 |
| 6 | 14 ÷ 3 = 4 remainder 2 |
| 7 | 3 ÷ 2 = 1 remainder 1 |
| 8 | 2 ÷ 1 = 2 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 63 and 76 | 1 |
| 182 and 109 | 1 |
| 186 and 34 | 2 |
| 144 and 85 | 1 |
| 135 and 114 | 3 |