Knowledge points in the second volume of the second grade of primary school (mathematics)
The first single metadata collection and collation
1. Collect data by orthography.
2. Use statistical charts to represent data.
3, according to the statistical chart can make some judgments.
4, data collection-sorting-analysis table.
The second unit division table (1)
I. Average score
1, the meaning of average score: divide some projects into several parts, and each part gets the same amount, which is called average score.
2, the average method:
(1) When some articles are divided equally according to the prescribed number of copies, they can be divided into one article or several times until all the articles are finished.
(2) Divide some items into several equal parts. Think about time-sharing: this number can be divided into several such parts.
Second, division.
1. Meaning of the division formula: As long as it is the process of average division, it can be expressed by the division formula.
2. How to read the division formula: usually read from front to back, read as division, = read as arithmetic, and other readings remain unchanged.
3. Name of each part of the division formula: In the division formula, the number before the division sign is the dividend, the number after the division sign is the divisor, and the number obtained is the quotient.
Third, use the multiplication formula of 2~6 to find the quotient.
1, the method of quotient:
(1) Find the quotient by the average score method.
(2) Use the multiplication formula to find the quotient.
(3) Use the multiplication formula to find the quotient.
2. When you use the multiplication formula to find the quotient, you should multiply the dividend of the divisor.
Fourth, solve the problem.
1, the solution to the average score problem:
Total number of shares per share = number of shares, total number of shares = number of shares, dividend = quotient dividend,
Dividend = quotient divisor+remainder, divisor = dividend quotient, factor factor = product,
One factor = the product of another factor.
2, with two steps to solve practical problems:
(1) The problem to be solved requires finding the total number and calculating by multiplication;
(2) Required questions require finding out the number of copies or the number of copies per copy, and calculating by division.
Knowledge points of mathematics in the second grade of primary school
Knowledge points to know the time:
1, 1 =(60) points.
2. The number upstream of the clock face (12), which divides the clock face into (12) equal grids, and each grid is divided into (5) equal grids, and there are (60) small grids on the clock face.
There are (2) hands on the clock face. The shorter needle is called (hour) needle, and the longer needle is called (minute) needle. When the minute hand walks at 1, it is (1) minutes, when the big hand walks at 1, it is (5 minutes), and when the hour hand walks at 1, it is (1). Minute hand from 12 to 6, go (30 points); The clockwise clock went from 12 to 6, and walked for (6) hours; Clockwise hand made a circle from 12, then returned to 12 and left (12).
4. (30) minutes can also be said to be half an hour, and (15) minutes can also be said to be a quarter of an hour. For example, 8: 30 is 8: 30, and 9: 00 15 is 9: 15.
At 5 o'clock (3 o'clock or 9 o'clock), the hour hand and the minute hand on the clock face are at right angles.
6. Write down the time on the clock face and draw the minute hand: the third question of the textbook is P 10 1, and the sixth question is P 105.
Mathematics wide-angle knowledge points:
1, when arranging combinations, according to a certain order, so as to avoid duplication or omission. Arrangement is related to order, such as the composition of numbers, the collocation of clothes and trousers, breakfast, queuing and so on. Combination has nothing to do with order, such as digital summation, handshake, juice mixing, etc.
2, 3 people, every two people play a game or shake hands and take pictures. * * * to 3 times.
3. Three nonzero numbers can form six tens and two digits with different digits, such as 4, 5 and 7 can form 45, 47, 54, 57, 74 and 75; If one is 0, it can form four two-digit numbers. For example, 0, 4 and 7 can form 40, 47, 70 and 74.
Mathematics learning methods and skills
First, the correct primary school mathematics learning methods-seize the classroom
Science study focuses on weekdays and is not suitable for surprise review. The most important thing to study on weekdays is to attend class for 45 minutes. Listen attentively and keep your thoughts close to the teacher. At the same time, it should be pointed out that many students tend to ignore the mathematical thinking methods taught by teachers and pay attention to the solution of problems. In fact, thinking methods such as "transformation" and "combination of numbers and shapes" are far more important than the solution of a problem.
Second, finish the homework with high quality.
The so-called high quality refers to high precision and high speed. When writing homework, I sometimes repeat the same type of questions. At this time, we should consciously examine the speed and accuracy, and we can have a deeper thinking about this kind of problem every time we finish it, such as the content it examines, the mathematical thinking method used, the rules and skills of solving problems, etc. In addition, the thinking questions assigned by the teacher should also be carefully completed. If you don't give up easily, you must carry forward the spirit of "nails" and think quietly whenever you have time. Inspiration always pops up in front of you. Most importantly, this is an opportunity to challenge yourself. What are the methods of learning mathematics in primary schools? Success will bring self-confidence, which is very important for learning science; Even if you fail, this question will leave a deep impression on you.
Third, think hard and ask more questions.
First of all, for the laws and theorems given by teachers, we should not only know "what it is", but also know "why it is like this". There are also some things we don't understand about the correct learning method of primary school mathematics, so we should get to the bottom of it. This is the way to understand. Secondly, we should be skeptical about learning any subject, especially science. If you have any questions about the teacher's explanation and the content of the textbook, please feel free to ask questions and discuss with the teacher. In a word, thinking and asking questions are the ways to eliminate hidden dangers in learning.
Fourth, sum up and contrast, and clear up ideas.
(1) summary and comparison of knowledge points. After learning each chapter, you should make a frame diagram of the content of this chapter or go through it in your mind to clarify the relationship between them. Similar and confusing knowledge points should be summarized and compared separately, and sometimes they can be distinguished by association.
(2) Summary and comparison of topics. Students can set up their own question bank. I have two sets of problem sets. One is wrong and the other is accurate. Write down the mistakes in the usual homework and exams selectively, and mark the matters needing attention with a red pen on one side. Just read what is written in red pen before the exam. I also wrote down some extremely clever or difficult problems I saw, and marked the methods used in this problem and the methods of mathematics learning in ideological primary school in red. After a long time, I can sum up some types of problem-solving rules and write them down in red notes. In the end, they will become your precious wealth and be of great help to your math study.
Fifth, do extracurricular exercises selectively.
Spare time is very precious to us middle school students, so when you do extracurricular exercises, you should be less and better. As long as you do two or three questions every day, your mind will be broadened after a long time.
The correct method of primary school mathematics learning is important, but the spirit of perseverance and Excellence is more important. As long as you work hard, you will learn math well. Believe in yourself, math will make your wisdom shine more!
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