Greatest Common Divisor (GCD) of 120 and 100
The greatest common divisor (GCD) of 120 and 100 is 20.
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 100?
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 ÷ 100 = 1 remainder 20 |
| 2 | 100 ÷ 20 = 5 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 196 and 45 | 1 |
| 123 and 49 | 1 |
| 153 and 21 | 3 |
| 103 and 138 | 1 |
| 71 and 34 | 1 |