Knowledge points of division with remainder in second grade mathematics
First, divide by the remainder.
1 has the meaning of remainder division: when some objects are divided equally, sometimes there will be a remainder.
2. Relationship between remainder and divisor: In division with remainder, remainder must be less than divisor. The remainder of is less than the divisor 1, and the smallest remainder is 1.
3. Calculation method of pen division:
(1) Write the division number "Factory" first.
(2) The dividend is written in the divisor, and the divisor is written to the left of the divisor.
(3) Trial quotient, written on the dividend, the dividend-oriented unit.
(4) Write the product of quotient and divisor under the dividend, and the same digits should be aligned.
(5) Divider minus the product of quotient and divisor. If there is no remainder, it means divisibility.
4. The calculation method of remainder division can be divided into four steps: one quotient, two squares, three subtractions and four ratios.
(1) Quotient: Trial Quotient. If you want to multiply the divisor by a few, the nearest dividend is less than the dividend, then the quotient is a few, written on the unit of dividend.
(2) Multiplication: multiply the divisor and quotient, and write the number below the dividend.
(3) Subtraction: Subtract the product of quotient and divisor from the dividend, and write the difference below the horizontal line.
(4) Ratio: Compared with the divisor, the remainder must be small.
Second, solve the problem.
According to the meaning of division, to solve the simple division problem with remainder, we should deal with the remainder flexibly according to the actual situation.
The second grade mathematics unit 7 knowledge points
1, know the time
(1) There are an hour hand and a minute hand on the clock face, which walk fast and the minute hand is long; Walk slowly, the shorter the hour hand;
(2) There are 12 large squares, 60 small squares and 1 large square with 5 small squares on the clock face. Walk clockwise 1 hour and walk in minutes.
(3) It takes one lap to walk clockwise 1, so 1 =60 minutes;
(4) Half an hour =30 minutes, and a quarter of an hour = 15 minutes.
(5) Time reading and writing: for example, 3: 30, which can be read as 3: 30 or 3: 30; 8: 05, you should write 8: 05.
2. Solve problems with knowledge
(1) events should be arranged in chronological order, and the time cannot be repeated.
(2) When asked what time it is in a few minutes, read out what time it is now, and then calculate what time it is in a few minutes.
(3) The hours when the hour hand and the minute hand can form a right angle are 3 o'clock and 9 o'clock.
Unit 7 Exercise
Fill in the blanks.
1. It takes () hours to walk a big grid when you walk clockwise.
The minute hand takes a small square (), a big square () and a circle ().
2,2:10 In another 30 minutes, it will be () when it arrives at ().
The time now is 7: 45 in the morning, and it will be 8: 00 in the morning after ().
4. The current time is 1: 57, and it will be () in 3 minutes.
5, () on the hour, the hour hand and the minute hand are in a straight line; () The minute hand coincides with the hour hand.
6. It's 1 1, and it's 2 o'clock ().
7. The minute hand turns from 6 to 9, with () minutes left, and the hour hand turns from 6 to 9, with () left.
8. On the clock face, the hour hand points to 8 and the minute hand points to 12, which is exactly ().
9. On the clock face, the hour hand has passed 7 and the minute hand has gone 30 squares from 12. This moment is () hours () minutes.
Math learning methods in grade two
1, the earlier mathematics is introduced, the easier it is.
Now mathematics is becoming more and more important in various selections and CET-6. Many parents want their children to learn some math. For students who want to choose a better school in the sixth grade of primary school in the future, our suggestion is that it is better to study early. First of all, learn mathematics early, and the knowledge system of mathematics is relatively complete, so there will be no need to cram the mathematics knowledge of grade three in grade six. Secondly, getting started early has enough time to stimulate children's interest in mathematics, and the difficulty of getting started is relatively low.
2. Interest is the most important, and the starting point is the key.
Many students in Grade 4 and Grade 5 want to start studying mathematics. Surprisingly, quite a few of these students did study mathematics in the lower grades, but gave up because of the poor learning effect in class at that time. In the senior year, due to the situation in the sixth grade, they had to study again. For such students, learning mathematics has a certain shadow, and even some students hold the idea that they are not suitable for learning mathematics and have certain resistance.
Therefore, since parents have decided to learn mathematics from the lower grades, they should first pay attention to the cultivation of interest and help their children find things that they are interested in mathematics, such as number games and so on.
At the same time, if you don't choose a good starting point, children will have a hard time learning and naturally will not be interested, so parents should also pay attention to the appropriate curriculum choice.
3. Good teachers and good habits
It is very important for second-year students to cultivate their interests and study habits. Therefore, finding a teacher that children like is the most important thing in learning. A good teacher can make children like classes quickly and infect students with their own personality charm. In class, teachers are not only teachers, but also friends of children. They discuss problems with their children and think together, so that children can develop good study habits and like math while enjoying their teachers.
Related articles on key knowledge points in the second volume of senior two mathematics;
★ Knowledge points in the second volume of second grade mathematics published by People's Education Press.
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★ Summary of Knowledge Points in the Second Book of Grade Two Mathematics (2)
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★ Summary of knowledge points in the second volume of mathematics in the second grade of primary school
★ Summary of knowledge points in the second volume of second grade mathematics.
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★ Summarize the knowledge points of second grade mathematics.