Rounding
A process that consists of providing a close and simpler value of a number that is known or to be calculated that is less precise but easier to use.
The normal method of rounding a number to a certain position consists of keeping the last digit in this position unchanged if it is followed by a 0, 1, 2, 3 or 4, or increasing the digit by 1 if it is immediately followed by a 5, 6, 7, 8 or 9. This way of rounding numbers corresponds to an approximation by rounding.
It’s important to pay particular attention to negative numbers, which do not work exactly the same way. In the case of a negative number, the last digit in this position remains unchanged if it is followed by a 0, 1, 2, 3, 4 or 5, or the digit is increased by 1 if it is immediately followed by a 6, 7, 8 or 9.
Example
If rounding a decimal number to the nearest whole, then:- 34.4 rounded gives 34
- 34.5 rounded gives 35
- 34.6 rounded gives 35
- −34.4 rounded gives −34
- −34.5 rounded gives −34
- −34.6 rounded gives −35