Greatest Common Divisor (GCD) of 156 and 120
The greatest common divisor (GCD) of 156 and 120 is 12.
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 156 and 120?
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 | 156 ÷ 120 = 1 remainder 36 |
| 2 | 120 ÷ 36 = 3 remainder 12 |
| 3 | 36 ÷ 12 = 3 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 121 and 64 | 1 |
| 64 and 122 | 2 |
| 97 and 170 | 1 |
| 149 and 179 | 1 |
| 159 and 28 | 1 |