Greatest Common Divisor (GCD) of 70 and 108
The greatest common divisor (GCD) of 70 and 108 is 2.
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 70 and 108?
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 | 70 ÷ 108 = 0 remainder 70 |
| 2 | 108 ÷ 70 = 1 remainder 38 |
| 3 | 70 ÷ 38 = 1 remainder 32 |
| 4 | 38 ÷ 32 = 1 remainder 6 |
| 5 | 32 ÷ 6 = 5 remainder 2 |
| 6 | 6 ÷ 2 = 3 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 24 and 21 | 3 |
| 183 and 84 | 3 |
| 68 and 156 | 4 |
| 189 and 94 | 1 |
| 111 and 61 | 1 |