Greatest Common Divisor (GCD) of 15 and 42
The greatest common divisor (GCD) of 15 and 42 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 15 and 42?
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 | 15 ÷ 42 = 0 remainder 15 |
| 2 | 42 ÷ 15 = 2 remainder 12 |
| 3 | 15 ÷ 12 = 1 remainder 3 |
| 4 | 12 ÷ 3 = 4 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 23 and 183 | 1 |
| 93 and 11 | 1 |
| 138 and 152 | 2 |
| 79 and 160 | 1 |
| 71 and 144 | 1 |