Greatest Common Divisor (GCD) of 30 and 75
The greatest common divisor (GCD) of 30 and 75 is 15.
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 30 and 75?
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 | 30 ÷ 75 = 0 remainder 30 |
| 2 | 75 ÷ 30 = 2 remainder 15 |
| 3 | 30 ÷ 15 = 2 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 109 and 12 | 1 |
| 36 and 52 | 4 |
| 56 and 168 | 56 |
| 118 and 124 | 2 |
| 117 and 139 | 1 |