**1.** Use a calculator to calculate (elementary calculations can be completed).

**2.** Use a calculator to estimate. If you use rational numbers to approximate irrational numbers in the eighth grade, you need to use a calculator to approximate the irrational numbers with rational numbers. In the second volume of the ninth grade, it is faster to study the approximate solutions of linear equations in one unknown.

**3.** Use a calculator to explore the rules. For example, use a calculator to verify and explore the law of “black hole number” in the seventh grade.

**4.** Use calculators to process more complex data. Calculators provide advanced calculation tools for mathematical applications, making it easier to process actual data, especially data from random experiments, so that mathematics applications have a broad space in middle schools. For example, in the eighth grade, students are encouraged to use calculators to easily calculate the standard deviation and variance of a set of data, which is of great benefit to the analysis of data and the study of data fluctuations.

**5.** Use a calculator to generate random numbers for simulation experiments. For example, in the ninth grade, you can use a calculator to generate random numbers for simulation experiments. It can be seen that the calculator can turn static into dynamic, and concrete and visualize abstract things. Make people’s thinking get a certain degree of extension. It can be seen that the use of calculators is an advanced calculation tool, which can not only save students a lot of time to learn other more valuable content, but also stimulate their interest in learning.