Greatest Common Divisor (GCD) of 120 and 15
The greatest common divisor (GCD) of 120 and 15 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 120 and 15?
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 | 120 ÷ 15 = 8 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 28 and 29 | 1 |
| 173 and 180 | 1 |
| 150 and 63 | 3 |
| 176 and 44 | 44 |
| 101 and 29 | 1 |