1, rounding principle
The principle of rounding is based on intuitive observation and the formulation of rounding rules. Its core idea is to minimize the error caused by intercepting decimal places when selecting numerical values, and to be closer to the accuracy of the original values on the premise of maintaining the rationality of the results. Therefore, rounding is not an absolutely accurate mathematical operation, but an approximate trade-off rule.
2. Application of rounding
In practical application, rounding can be used in various scenarios. For example, when calculating tax or interest, we often use rounding to approximate the calculation. In addition, in the processing of some statistical data, in order to simplify the results or reduce the redundancy of data, rounding can also be used.
3. Rounding rules
In rounding rules, the value to be rounded is usually one or more digits after the decimal point. If the value is less than 5, the value to be rounded will remain unchanged; If the value is greater than or equal to 5, add 1 to the value to be rounded.
The Origin and Importance of Rounding
I. Origin of rounding
The origin of rounding can be traced back to the calculation method adopted in ancient China. If you encounter a decimal part, you will be treated as full five into one, and if you are not satisfied, you will give up. This rule has been used to this day, which is usually called rounding.
Internationally, rounding first appeared in the number theory written by Indian mathematician Ayepihai, and was introduced to China around the 8th century. With the development of economy and mathematics, rounding is widely used and gradually becomes a common rounding method in the world.
Second, the importance of rounding.
1, rounding is an accurate counting reservation method, which is unique in that the difference between the reserved part and the actual value cannot exceed half of the last rounding order.
2. In statistics, rounding can minimize the sum of all reserved numbers, so it is widely used.
3. In economics, rounding can avoid the calculation error caused by rounding error.
4. In a computer, rounding is usually operated by the round function, which can handle various data types, such as integers and floating-point numbers.