Greatest Common Divisor (GCD) of 100 and 40
The greatest common divisor (GCD) of 100 and 40 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 100 and 40?
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 | 100 ÷ 40 = 2 remainder 20 |
| 2 | 40 ÷ 20 = 2 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 136 and 39 | 1 |
| 50 and 19 | 1 |
| 149 and 181 | 1 |
| 54 and 36 | 18 |
| 177 and 136 | 1 |