Greatest Common Divisor (GCD) of 138 and 168
The greatest common divisor (GCD) of 138 and 168 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 138 and 168?
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 | 138 ÷ 168 = 0 remainder 138 |
| 2 | 168 ÷ 138 = 1 remainder 30 |
| 3 | 138 ÷ 30 = 4 remainder 18 |
| 4 | 30 ÷ 18 = 1 remainder 12 |
| 5 | 18 ÷ 12 = 1 remainder 6 |
| 6 | 12 ÷ 6 = 2 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 138 and 114 | 6 |
| 44 and 143 | 11 |
| 175 and 23 | 1 |
| 131 and 122 | 1 |
| 168 and 65 | 1 |