Greatest Common Divisor (GCD) of 117 and 156
The greatest common divisor (GCD) of 117 and 156 is 39.
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 156?
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 ÷ 156 = 0 remainder 117 |
| 2 | 156 ÷ 117 = 1 remainder 39 |
| 3 | 117 ÷ 39 = 3 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 80 and 174 | 2 |
| 151 and 128 | 1 |
| 172 and 36 | 4 |
| 90 and 107 | 1 |
| 162 and 93 | 3 |