Rounding: It is an accurate counting reservation method, which is essentially the same as other methods. But the special point is that the difference between the reserved part and the actual value cannot exceed half of the last order of magnitude: if there is a probability of 0 ~ 9, the error sum of this method is the smallest for a large number of reserved data. This is why we use this method as the basic booking method.

Estimation: It means approximate calculation. Such as estimate production. In psychology, estimation is a general inference or estimation of the number of things or the result of formulas according to specific conditions and related knowledge. In mathematics, estimation is an important part of computing power.

An example of rounding

Example 1: For example, π is rounded, leaving 3. 14. But sometimes you can use "one-in method" and "one-out method" instead of rounding. The rounded fourth house is 0, 1, 2, 3, 4, and the fifth house is 5, 6, 7, 8, 9. For example, 288 students have a spring outing, and 45 people have a bus, which is 6.4 buses. However, you must get into a bus to avoid letting more people out and fewer cars. Because the number of cars cannot be decimal, seven buses are needed.

Example 2: Practical application in life and work-for example, the annual market share is estimated to be 0.7%, but the estimated value is rounded to 1% when presented at the official press conference for aesthetic reasons. It will carry more weight in words and appearance.