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Analysis of the 2020 Provincial Examination Test Data: See the Big in the Small and the Magical Mantissa Method

2019-12-27 10:08:07 | Source: Chinese Education Zhang Qi

In the investigation of line test data analysis, we will encounter a class of questions. After reading the questions, we can clearly list the addition and subtraction expressions, but sometimes we find that the amount of calculation is large, which makes the calculation difficult. So, how can the addition and subtraction of multiple numbers be calculated faster and more accurately? Today CCP Education takes everyone to learn the mantissa method together.

The meaning of mantissa

What is the mantissa method? In fact, it is a method for determining the answer by calculating the mantissa in the formula. The application environment of the mantissa method is generally the calculation of addition and subtraction.

Application of mantissa

1. There were 305,800 new car drivers in the city in 2015, and the number of new car drivers was 14,700 more than in 2014.

From 2014 to 2015, a total of 10,000 new car drivers were added to N cities.

A.58.22 B.56.59 C.61.16 D.62.23

[Answer] B Chinese public analysis: According to the description of the text materials, at the end of 2015, there were 305,800 new car drivers in N city, which is 14700 more than in 2014. Then there were new car drivers in 2014 (30.58-1.47) 10,000 people, the required value is 30.58 + 30.58-1.47, the mantissa of the options are different, the last digit is calculated, 8 + 8-7 = 9, only the B item meets. Therefore, choose B for this question.

2. During the 12th Five-Year Plan period (2011-2015), the total number of newly registered cars in N City is: ()

192,300 in 2011, 198,900 in 2012, 245,800 in 2013, 348,900 in 2014

285,800 units in 2015

A.127.53 B.127.43 C.128.93 D.127.63

[Answer] A Chinese public analysis: According to the data given by the material, the total number of cars from 2011 to 2015 is

19.23 + 19.98 + 24.58 + 34.89 + 28.85, since the last digit of the option is the same, we calculate the last two digits, 23 + 98 + 58 + 89 + 85 = 353, so only A meets the meaning of the question. Therefore, choose A for this question.

In summary, if we encounter this kind of problem, we can first observe the option to see if the option is different from the last one or the last two. If so, we can give priority to using the mantissa method to determine the answer. Pay attention to the process of using Middle digits are aligned. In this way, we can save some calculation time in the process of solving the actual problems. Of course, this small skill alone is not enough to meet the various questions of our public examination. It still requires our candidates to continue to practice to solidify the foundation and master A variety of question types and calculation methods and skills, only in this way can be at ease in the examination room, become intimate. I hope you can gain something.

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(Responsible editor: Zhang Ye)

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