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 |
|---|---|
| 155 and 72 | 1 |
| 116 and 30 | 2 |
| 184 and 191 | 1 |
| 178 and 62 | 2 |
| 141 and 63 | 3 |