Knowledge points of "abdication subtraction within 20" in mathematics of the first grade of primary school
Method 1:
"You want to add if you do subtraction" or "you want to add and subtract" is 8+7= 15, so 15-8 = 7, 15-7 = 8.
The calculation method of "doing subtraction and adding" or "adding and subtracting" seems simple, but it requires students' thinking ability. First, students are required to master addition within 20, so as to quickly apply "doing subtraction to add" or "adding and subtracting".
Method 2:
Breaking Ten Law 12-5= 10-5+2=7
The calculation method of "breaking ten methods" is an unpopular method if students are allowed to think about the calculation method themselves. This method can only be mastered by students who study under the guidance of teachers. First of all, tell the students that if 3 is not enough and 5 is reduced, don't reduce it first. Let 10 students borrow 1 into one 10-5, and then the number 5 and the remaining 2 are combined into 7.
Method 3:
Ten-level method14-5 =14-4-1= 9
"Ten-connected method", also known as "continuous subtraction", is characterized by dividing meiosis into the unit of complement meiosis and another number, for example, 5 is divided into 4 and 1, then 14-3= 10, and finally10-1=.
Method 4:
"Less more and more"13-9 =13-10+1= 4.
The characteristic of the method of "subtracting more and adding more" is to subtract the value of subtraction from complement and add 9 to get the number 10, for example, 9+ 1 = 10, and then 13-65438+.
Method 5:
"Add the minuend to a number that can be reduced enough" 13-5= 15-5-2=8.
The method of "adding the minuend to the number that can be reduced" is to add the minuend to the number that can be reduced by the minuend, and then subtract the added number. For example, 13-5 becomes 15-5-2=8, which is easier for students to master.
Knowledge points of "understanding graphics" in senior one mathematics
A, graphics can be divided into (1) plane graphics; (2) Three-dimensional graphics
1. Plane graphics: square, rectangle, triangle, circle, parallelogram.
2, three-dimensional graphics: cuboid, cube, cylinder, sphere.
Second, the combination of graphics.
1, two identical triangles can be combined into a parallelogram; Two identical triangles can be combined into a parallelogram, a rectangle or a large triangle.
2. It takes at least 4 small cubes to form a big cube, and at least 8 small cubes to form a big cube.
3. Two rectangles can form a big rectangle. (Two special rectangles can form a big square), and four cuboids can form a big cuboid.
learning process
1. Teachers lead students to recall the characteristics of three-dimensional graphics.
2. Play the micro video to the students.
(Courseware shows cuboid, cube, cylinder, sphere and triangular prism, and plays the process of "unfolding" plane graphics from three-dimensional graphics)
3. Organize students to draw, draw, print and unfold plane graphics in exercise books by using learning tools with different shapes prepared before class. Students who draw well and quickly can share his works with Mr. Mai.
4. Know rectangle, square, circle and triangle.
5. Know the parallelogram (guide students to observe the parallelogram composed of two identical triangles)
Teacher: Can you fold a square, rectangle or parallelogram paper into the same two parts? How many folding methods are there? Who wants to tell us how they are folded? What graphics are folded out? Please do it yourself. Students who are prepared can even join Mr. Mai.
Learning methods of mathematics in grade one.
Review is a process of consolidating and improving what you have learned.
32 knowing what things should be like shows that you are smart; Know what things are, and you will have experience; Knowing how to make things better shows that you are very talented.
People often say that time is life, so we should control the life controlled by time and learn to manage our own time. We can be masters of time, life and ourselves.
Debris seems troublesome, but it is actually very effective, because it conforms to the laws of human memory, but it can save time.
Metaphor can turn boring knowledge into vivid and interesting knowledge. Teachers are always good at using metaphors to deepen students' understanding, and students should also be good at using metaphors to help them remember.
The foundation of deep understanding is deep memory, and it is most appropriate to teach knowledge through understanding and using memory. If there are similar formulas and theorems, they can be compared by list memory.
Don't regard learning as a dull logical thinking process. It is very helpful to use your imagination boldly in your study life to improve your academic performance.
If every class is regarded as a small battle, it is very necessary to fully preview before class, just like the police before the war.
In the face of setbacks, consciously adjust your psychological state and don't focus on painful experiences.
It is a long-term job to keep healthy and energetic. We should pay attention to cultivate our good habits, persist in exercise, and ensure abstinence and order in life.
Learn to clear and express your emotions, understand the great relationship between emotions and physical and mental health, learn to adjust and control your emotions, and have a healthy and happy youth.
Learning is a long-term and arduous mental work. If you study too hard and last too long, it will lead to study fatigue.
Study fatigue will not only affect your study efficiency, but more importantly, excessive study fatigue will also harm your health.
As the saying goes, no pains, no gains, let us grow. We must work hard. Learning is not an easy task. In order to get good results, we must make corresponding efforts.
The internal relationship between numbers and shapes, especially their essential attributes and scientific laws, is difficult to understand only by feeling, perception or representation. Only through thinking can we deeply understand and firmly grasp them.
A person shapes himself not only by what he was born with, but also by what he learned from his study.
Quick success and instant benefit can easily lead to failure, and learning should be gradual.
For different types of problems, we can adopt a variety of methods, and choose the correct method according to the actual situation in practice, which can save time and energy to complete the problem.
Teachers should always follow the train of thought, be good at mastering the key words in the teacher's explanation and establish their own knowledge structure.
Through the reflection and refinement of the analytical reasoning process in the process of solving problems in the last class, it is helpful to understand the content of the new curriculum.
Comparing and reviewing with charts can help us review our knowledge accurately.
For the knowledge with obvious progressive relationship, the knowledge circuit diagram can be drawn.
Doing problems is the most effective way to consolidate knowledge, and it is also an important link in the learning process.
Don't think that the teacher in the textbook said that even if you pass, you should know that these examples are often exams. Is the basic knowledge solid?
Thinking after questions is an effective way to improve knowledge level, deepen thinking depth and improve thinking tension.
Replace the completed result with the problem to see whether the known quantity given by the original problem can be reversed, or whether the known conditions drawn from the conclusion are consistent with the known conditions of the original problem.
"To do a good job, we must first strengthen his"-a good student is very good at consolidating his memory by using learning materials, thus improving his grades.
Textbooks have always been the focus of students' study. Therefore, we should not only master the concepts and formulas in the textbook, but also ignore some details in the textbook.
There are three types of questions that don't need to be done in reference books: questions that are completely mastered, questions that are beyond the examination outline, and questions that are too strange.
Teachers' questions are often related knowledge, difficulties or places where students are prone to make mistakes. Other students should pay attention to listening, listening and analyzing when they speak.
An article about the knowledge points of senior one mathematics last semester;
★ Knowledge points of mathematics in the first grade of primary school
★ Knowledge points of the first volume of mathematics in Grade One of People's Education Edition
★ Learn the knowledge points of the first volume of mathematics in senior one.
★ The key arrangement at the end of the first volume of the first grade mathematics.
★ Summary of compulsory knowledge points in first grade mathematics.
★ Knowledge points in the first volume of first grade mathematics
★ Outline of Mathematics Review for the First Volume of Senior One.
★ 202 1, the first book of mathematics knowledge points in grade one.
★ Arrangement of knowledge points of mathematics in grade one.
★ Review knowledge points of senior one mathematics: number and algebra