Inappropriate operation is largely due to the lack of understanding of basic concepts, thorough grasp of basic formulas and laws, and unskilled application. Therefore, in teaching, teachers should be consciously and systematically equipped with some exercises instead of using calculators to train. When students can skillfully apply concepts, formulas and rules, and their accuracy is guaranteed, they might as well use calculators again. Take calculator as an auxiliary tool for learning, so that students can be liberated from calculation and devoted to the study of other problems.
2. The impact of using calculators on flexibility
The operation should be reasonable, simple, skilled and fast, and students should be flexible in operation and quick in thinking. The improvement of this ability requires students to observe and think about the problem from many sides, angles and directions when solving problems. However, scientific calculators can solve complex operations quickly. If students blindly use calculators, they will simply and mechanically input data to solve problems without thinking about how to solve problems quickly and concisely. Without this kind of training, it is equivalent to losing an effective way to improve computing power. I think we can finish a certain part of the content first, and then take a lesson (or several lessons) to solve problems with a calculator. Before that, calculators are not allowed. For example, in the seventh grade, after adding rational numbers, use a calculator to solve problems, and after subtracting, it is best to finish the foundation, and students will go to the calculator class after practicing. Or, when encountering such problems, such as calculating18.75-15.39+1.25-14.61,ask students to solve them in a simple way and consciously support their flexible, reasonable and simple operation.
3. The influence of calculator on rigor
When using a calculator, the calculation process is generally omitted. However, whether it is the usual requirement or the exam, the problem-solving process is required to be complete and standardized, which is actually the embodiment of the thinking process. Due to the lack of training in using calculators, students' problem solving is not standardized and complete, which is a serious defect and is very unfavorable to the improvement of students' mathematical thinking and quality.
4. The influence of using calculator on mathematical thinking and psychological quality
Operation plays a considerable role in cultivating students' scientific way of thinking and forming good thinking habits and psychological quality. If you use scientific calculators too much, students will be unwilling to spend time thinking and doing standardized calculations, so as to engage in them rashly. Over time, my thinking is disorganized, my operation is getting rusty, and I have developed a bad habit of carelessness, lacking will and perseverance. At the same time, some students are only used to one-way single-level operation, forward calculation, multi-direction multi-level operation and reverse operation. Without a scientific calculator, students have to pay attention to the direction and skills of operation, which can form the habit of looking forward and backward and looking at the overall situation. Through long-term training, students' mathematical thinking ability has been improved, and their confidence and perseverance have been enhanced.
China's educational tradition attaches great importance to the training of basic skills. Students in China often have a solid foundation, and some college students in the United States are not as good as middle school students in China in calculation. However, the advantages of high school students in basic computing ability are becoming less and less obvious. A high school math teacher said: "Many colleagues have this feeling. Now, as soon as they arrive in the first year of high school, they have to make up for the students. Both teachers and students feel hard. " The parents of a senior high school student said: "Because calculators can be used in the senior high school entrance examination, but not in the college entrance examination, my son should quit calculators after he entered high school. Because of his long-term dependence on calculators, his son expressed doubts about his ability to make oral and written calculations, and he was very uneasy about the results of the calculations. Usually homework is written first, and then checked with a calculator, which is a waste of time. After more than a year, I finally quit the calculator. " All these phenomena also confuse me. Why can I use a calculator in the senior high school entrance examination and not in the college entrance examination? How can students adapt to this change as soon as possible?
In a word, science and technology in the information society are changing with each passing day, and the use of computers and scientific calculators is becoming more and more popular. Can middle school mathematics turn a blind eye? Can the mathematics education circle sit still? The use of calculators is no longer an economic problem, but an inevitable result of social progress and scientific and technological development. However, the use of calculators also weakens students' computing ability and affects the improvement of students' mathematical quality. We should guide students to use calculators reasonably, on the one hand, we should ensure the improvement of computing ability, on the other hand, we should be able to operate calculators skillfully.