Greatest Common Divisor (GCD) of 21 and 39
The greatest common divisor (GCD) of 21 and 39 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 21 and 39?
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 | 21 ÷ 39 = 0 remainder 21 |
| 2 | 39 ÷ 21 = 1 remainder 18 |
| 3 | 21 ÷ 18 = 1 remainder 3 |
| 4 | 18 ÷ 3 = 6 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 16 and 153 | 1 |
| 103 and 19 | 1 |
| 150 and 42 | 6 |
| 130 and 59 | 1 |
| 14 and 94 | 2 |