Mathematics knowledge points in the first volume of the second grade of primary school
Knowledge points of length units and angles
1. A ruler is a tool for measuring the length of an object. Commonly used length units are: meters and centimeters. The index finger is about 1 cm wide and the arms are about 1 m. 1m = 100cm 100cm = 1m。
2. The measurement unit of shorter objects is usually centimeters, and the measurement unit of longer objects is usually meters.
3. When measuring the length of the object: aim the "0" scale of the ruler at the left end of the object, and then see how many centimeters the right end faces the scale. Object length = large number-decimal number, for example, from scale "0" to scale "6" is 6 cm (6-0=6), and from scale "6" to scale "9" is 3 cm (9-6 = 3); You can also calculate the length of an object by counting. (Count, count)
4. The line segment is straight and its length can be measured.
5. Method of drawing line segments: Draw from the "0" scale of the ruler, the longer the better. (find some lines; Sometimes you have to work out the length before drawing a line. Draw a line 2 cm shorter than 6 cm. )
6. This angle has 1 vertices and two straight sides. Acute angle is less than right angle, obtuse angle is greater than right angle, and obtuse angle is greater than acute angle. Acute angle).
7. You can draw a right angle with a triangle, and the right angle should be marked with a right angle symbol (also called the vertical foot symbol).
8. All right angles are the same size. To know whether an angle is a right angle, you can compare it with the right angle on a triangle. A rectangle and a square have four corners, all of which are right angles.
9. The angle has nothing to do with the length of both sides, but with the size of both sides.
10, each triangle has three angles, of which 1 is a right angle and the other two are acute angles.
1 1, Angle drawing: Starting from one point, draw two straight lines in different directions with a ruler to draw an angle. A figure composed of two rays drawn from a point is called an angle. )
Exercise:
1, 1 m21cm = () cm
53cm- 18cm = () cm
A big tree is 10 ()
2. My height is () meters () centimeters.
3. A corner has () vertices and () edges.
A book is 15 ()
There are three angles and () right angles in a triangle.
The longer the sides of an angle are, the bigger the angle is. ()
Mathematics learning methods and skills
1, preview before class. Preview is to let children understand new content with what they have learned before. They will find problems in the preview process and listen to the teacher with problems. This method can make children's learning more targeted, improve learning efficiency, and cultivate children's autonomous learning ability.
2. Review after class. After-class review is the consolidation of what you have learned. Through review, children can deepen their memory of knowledge, thus slowing down the speed of forgetting. If children learn to review after class, their academic performance will rise steadily and their memory will be improved.
3. Write carefully. Thesis is the first impression students give teachers, which directly affects teachers' evaluation of students' learning attitude and personal quality. A student who writes carefully often takes his studies and other things seriously. Therefore, parents should pay attention to their children's writing habits, put forward writing requirements as soon as possible, help their children improve their writing quality, and thus cultivate their careful and serious habits.
4. Organize your notes. The number of subjects will increase with the increase of grade, so students need to take notes to grasp the key points of each subject. But the class time is limited, and few students can take organized notes in class, so let the children sort out their notes after class. The process of finishing is a re-learning process, and it can also cultivate children's ability to analyze and summarize.
5. Encourage reading. Reading is the main way for children to acquire extracurricular knowledge and broaden their knowledge. Parents should encourage their children to read after class. Parents can buy books, newspapers and magazines that their children are interested in, improve their children's reading interest and create reading conditions for them. In addition, parents should also let their children write articles such as post-reading feelings to cultivate their writing ability.
6. Solve it yourself. Children often turn to their parents for help when they encounter difficulties in their studies. At this time, parents must not be perfunctory, but should encourage their children to solve it themselves. If the child can't solve it by himself, parents should not do it for him. They should patiently inspire the child to think and guide him to solve the problem. This can not only cultivate children's ability to solve problems independently, but also enhance their self-confidence.
Mathematics learning skills
As we all know, the purpose of education is not only to stay in grades, but more importantly, to cultivate learning methods and habits, thinking and interest. As a liberal arts student, if you want to get high marks in the college entrance examination, you must master the learning methods and draw inferences from others in peacetime. I am well aware of the importance of mathematics to me. In my opinion, I must realize the importance of mathematics in peacetime. This is the beginning of a good attitude. If I look at mathematics correctly, I will not be too anxious, nor will I despise carelessness. If I face every exam with a more cautious and philosophical attitude, I will succeed.
A good attitude comes from the usual accumulation. If you take every small exam seriously, you will feel better and better in the excitement brought by moderate tension, which is one of the prerequisites for the success of the college entrance examination.
A good attitude can give people confidence and courage, but this is only the cornerstone. In the study of mathematics, the most important thing is probably the first-class pedal-practice. For senior high school students, it is no longer necessary to emphasize the importance of listening carefully in class and finishing homework carefully. Repeated practice is different from blind sea tactics. Inference is not only the ability, but also the study habits and requirements. I am not such a clever student. I often encounter many new topics that I can't do or even have never seen before. However, avoiding problems and new problems at once will not only help improve your grades, but also make you lose confidence. Instead, it is better to stick to the problem and ponder a little. Sometimes we suddenly find that the original methods and ideas of solving problems are familiar and skilled, but the topic has changed into a new face. Therefore, we should always be familiar with the basic knowledge, methods and ideas required by the outline. Teachers will repeatedly emphasize in teaching that as long as they digest knowledge points and summarize problem-solving methods according to the teacher's rhythm, they can always master them skillfully within three years and internalize them into their own knowledge reserves, which is a step closer to success.
Don't lose a penny you deserve.
Review carefully before the exam. Some people may think that this is a cold turkey, but I think it is more efficient than usual, although some people disagree. In fact, during this time, I focused on the outline, simplified the content, returned to the textbook, paid attention to the foundation, and reviewed the teacher's notes, classic examples and important concepts. After all, 70% of the exams are basic, so it's a cliche to get high marks, and I can't lose the points I deserve, so I got a few more points than others.
Senior two, the first volume of mathematics knowledge points finishing related articles;
★ Sorting out the key knowledge of mathematics in the first volume of the second grade of primary school
★ Arrangement of conceptual knowledge points in the first volume of second grade mathematics
★ The induction of mathematics knowledge points in the first volume of the second grade of primary school
★ Basic knowledge points of second grade mathematics
★ Knowledge points in the second volume of the second grade math book
★ Mathematics Knowledge Points of Grade Two in Beijing Normal University
★ Summary of Mathematics Knowledge Points in Grade Two of Primary School
★ Knowledge points of the first volume of second-grade mathematics published by People's Education Press
★ Mathematics knowledge points in the second grade of primary school
★ Knowledge points in the first volume of the second grade mathematics unit