Greatest Common Divisor (GCD) of 49 and 84
The greatest common divisor (GCD) of 49 and 84 is 7.
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 49 and 84?
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 | 49 ÷ 84 = 0 remainder 49 |
| 2 | 84 ÷ 49 = 1 remainder 35 |
| 3 | 49 ÷ 35 = 1 remainder 14 |
| 4 | 35 ÷ 14 = 2 remainder 7 |
| 5 | 14 ÷ 7 = 2 remainder 0 |
Examples of GCD Calculations
| Numbers | GCD |
|---|---|
| 157 and 66 | 1 |
| 161 and 57 | 1 |
| 50 and 56 | 2 |
| 158 and 149 | 1 |
| 161 and 127 | 1 |