First, remember the rules and use them skillfully:

If students want to do calculations correctly, understanding the laws of memory is the foundation. A student who can't recite the rules can't do the corresponding calculation problems correctly, so he can only memorize them, and students who don't understand the meaning can't do them correctly. Confucius said, "Learning without thinking is useless, and thinking without learning is dangerous." That's what it means.

For example, when calculating the simple rational number addition of "-13-9", students can make -22, 22, -4, 4 and other results. According to the experience of some excellent students, if you want to do mathematical calculation accurately and quickly, you should not only remember the rules, but also do more questions corresponding to the knowledge points. There is no other shortcut.

Second, the creation of situations, calculation and the actual life of students, so that abstract numbers "live":

Abstract and boring numbers are mixed with symbols such as addition, subtraction, multiplication, division, multiplication and division, which makes students with poor computing ability even more disgusted. They don't want to do it when they see a series of formulas, let alone the speed and accuracy of calculation. But if it is related to the actual life of students, the situation is very different.

For example, when studying Pythagorean theorem, I asked students to measure the height and width of the classroom door, and calculate how many meters the wooden stick can pass through the door according to Pythagorean theorem. When explaining the linear equation, I introduced it like this: "Students, I have a daughter. I am 40 years old. I am five years older than my daughter. Guess how old she is this year? "

Stimulate students' interest in calculation with examples from life, make abstract numbers "live" and make numbers have feelings, so that calculation is not so difficult. Let students realize the importance of calculation in real life. Interest is the best teacher and the first motivation for learning. Grasping this favorable condition and combining it with practice in time will definitely get twice the result with half the effort.