1, rounding method: this is the most commonly used method and the most basic method. In rounding, if the number to be rounded is less than 5, it is rounded directly; If the number to be rounded is greater than or equal to 5, 1 is rounded forward. For example, 2.345 with two decimal places is 2.35.
2. One-step method: This method is to enter 1 forward when the number to be discarded is greater than or equal to 1. For example, 2.345 divided by two decimal places is 2.35.
3. Truncation method: This method directly truncates when the number to be truncated is less than 1. For example, 2.345 retains two decimal places by truncation, which is 2.34.
4. Linear interpolation method: This method is to get approximate value by linear interpolation between two known values. For example, given that the squares of 1.5 and 2.5 are 2.25 and 6.25 respectively, the square of 1.8 can be obtained by linear interpolation, that is, (1.8-1.5)/(2.5-1.
The importance of learning mathematics;
1, mathematics is the foundation of science: mathematics is the basic science, and it is the foundation of physical, chemical, biological and other natural sciences. Many scientific researches need mathematical methods for analysis and reasoning. It can be said that there would be no modern science without mathematics.
2. Mathematics is the foundation of technology: Mathematics is also the foundation of many technical fields, such as computer science, electronic engineering and mechanical engineering. Mathematics provides many tools and methods to solve problems, such as algorithms, data structures, probability statistics and so on. , making the development of these fields more rapid and efficient.
3. Mathematics is the foundation of economic development: Mathematics also plays an important role in the economic and financial fields. Mathematical methods can help economists and financial analysts better understand and predict market changes and formulate more scientific policies and investment strategies.
4. Mathematics is the foundation of social development: Mathematics also plays an important role in social development. For example, mathematical methods can help urban planners to better plan urban layout and traffic routes and improve urban operation efficiency; Mathematics can also help social scientists better understand and predict social phenomena and make more scientific policies and plans.
Mathematics is an important way to cultivate thinking ability: learning mathematics can not only master mathematical knowledge, but also cultivate thinking ability. Mathematics needs strict logic and reasoning ability, which can be exercised by learning mathematics to make people smarter and more flexible.