Greatest Common Divisor (GCD) of 45 and 90
The greatest common divisor (GCD) of 45 and 90 is 45.
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 45 and 90?
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 | 45 ÷ 90 = 0 remainder 45 |
| 2 | 90 ÷ 45 = 2 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 189 and 161 | 7 |
| 142 and 102 | 2 |
| 139 and 153 | 1 |
| 115 and 192 | 1 |
| 106 and 41 | 1 |