Greatest Common Divisor (GCD) of 198 and 120
The greatest common divisor (GCD) of 198 and 120 is 6.
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 198 and 120?
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 | 198 ÷ 120 = 1 remainder 78 |
| 2 | 120 ÷ 78 = 1 remainder 42 |
| 3 | 78 ÷ 42 = 1 remainder 36 |
| 4 | 42 ÷ 36 = 1 remainder 6 |
| 5 | 36 ÷ 6 = 6 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 112 and 53 | 1 |
| 66 and 187 | 11 |
| 139 and 188 | 1 |
| 103 and 163 | 1 |
| 116 and 132 | 4 |