Greatest Common Divisor (GCD) of 117 and 30
The greatest common divisor (GCD) of 117 and 30 is 3.
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 117 and 30?
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 | 117 ÷ 30 = 3 remainder 27 |
| 2 | 30 ÷ 27 = 1 remainder 3 |
| 3 | 27 ÷ 3 = 9 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 170 and 130 | 10 |
| 92 and 132 | 4 |
| 169 and 143 | 13 |
| 111 and 36 | 3 |
| 198 and 72 | 18 |