Selected students' test skills: quickly grasp characteristic figures - quick calculation to get high scores

In the line test, data analysis is the type of question that most examinees want to score quickly, but examinees delay a lot of time because the calculation is not fast and accurate enough. If there is a method that can calculate quickly in the process of reviewing and preparing for the exam, it will certainly make the problem solving simple and smooth. Zhonggong Education especially recommends a method - characteristic number method for the calculation of the analysis of the travel test data to the examinees, so as to help them quickly solve the calculation problems.

1、 What is characteristic number method

Using the conversion between percentage and fraction, the percentage is approximately converted into some specific fractions, so as to simplify the calculation. This method is called characteristic number method.

2、 Application environment

Any formula containing percentage may be calculated by the characteristic number method, for example, the formula containing growth rate, proportion, etc.:

3、 Method application

4、 Characteristic score accumulation

The characteristic score method itself is not difficult, easy to understand and requires less calculation, but the biggest problem for examinees is that they can't remember so many transformations between percentages and scores. Therefore, CUHK has sorted out the common methods of memorizing characteristic scores. Instead of rote memorization, examinees can remember by finding the relationship between the numbers according to the relationship between the data. The methods are as follows:

1. Divide the previous score and percentage by 2 at the same time (multiple relationship)

2. Regular recurring decimal

Fractions with a denominator of 7 are written as decimals in the number cycle of "142857", but the order is different. When memorizing, divide the numerator by 7 to see what the first significant number is, and then the cycle number begins. So remember the cycle number, and remember this group of fractions.

3. Find relationships

The common scores and percentages can find the relationship between each other. The burden of examinees can be reduced by memorizing according to skills. The above contents can be further sorted out as shown in the table:

The data in the analysis of travel survey data are relatively large, so the calculation is actually more about skillful calculation and estimation. If you want to make a quick calculation in limited time, you need to master some methods at ordinary times, and then train and summarize through a certain amount of questions. I believe that all examinees can master them in time through continuous practice!

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