Generally speaking, the first volume of first-year mathematics is about graphic calculation, including:
One figure, one type, one figure, two types and one figure, four types. A figure and a formula appear at the beginning of learning, including addition and subtraction. The formula of one digit and two digits appeared in the subsequent research, and the two addends were exchanged, subtracted and added.
One-number-four formula appeared after skillfully learning one-number-one formula and one-number-two formula. There are two addend exchanges and subtraction exchanges, in order to make students more familiar with the exchange of addition and subtraction.
The new curriculum standard emphasizes the cultivation of students' problem consciousness, so that students can find, ask, analyze and solve problems by themselves, and form the ability to collect and process mathematical information. Therefore, when learning the first volume of senior one mathematics, it can be divided into several steps:
First, observe the pictures and exchange ideas.
Second, tell the process and ask questions.
Third, list the formulas and work out the numbers.
Fourth, various algorithms, review right and wrong.
Among the above steps, the first step is to ask the teacher to give more guidance and inspiration. Fourth, teachers should give more guidance and broaden their thinking. Generally speaking, students should be allowed to think more, talk more and do more. Only when students personally experience the process of solving problems can they form problems.
In addition, look at the methods and methods of table calculation strategy:
So far, all kinds of problems of graphic calculation have been touched.
1, according to calculation steps: one-step calculation and two-step calculation;
2. According to the types of questions, there are: Figure 4, Figure 2, Figure 1, bracket type,
Add and subtract mixed types and situational graph types.
Summarize the problem-solving methods according to various questions, so that parents can guide students.
1、
Analysis and explanation:
1) Left plus right equals one * * *; 2) Right plus left equals one * * *;
3) One * * * minus left equals right; 4) One minus right equals left.
Note: If the positions of four formulas are given, it is the formula in Figure 4, which should be different from the formula in Figure 2.
4+5=9,5+4=9,9-4=5,9-5=4
2、
Analysis and explanation: the left and right numbers are the same 3+3=6, 6-3=3.
3、 ? 7-4=3,7-3=4
3+4=7,4+3=7
Analysis and explanation:
If the positions of two writing formulas are given, a graph and two formulas are listed;
If you give the location of a writing formula, list a picture and a formula.
4、 8-3=5
Analysis and explanation: crossed out with a short line or circled with a dotted line indicates subtraction, which is a subtraction operation.
5、
2+3+4=9
6、
Analysis and explanation: cross out with short lines or circle with dotted lines.
Or both are crossed out and circled with dotted lines,
They all mean subtraction, which means subtraction calculation.
10-2-3=5 or 10-3-2=5.
7、
6-2+3=7 or 6+3-2=7
16
8. Three situations related to braces:
1) curly braces mean "find a * * *": (omitted)
2) curly braces mean "find any part": (abbreviated)
For 1 1, 12, please refer to all related topics in the math books and exercises.
Need to focus on strengthening understanding and consolidation.