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.
Mathematics knowledge points in the first volume of the second grade of primary school
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.
practise
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.
10, when the hour hand points to 6 and the minute hand points to 12 (). At this time, the hour hand and the minute hand are in a straight line.
Knowledge points of "understanding direction" in the second grade of primary school mathematics
First, in the opposite direction:
East-west
north-south
Northeast-southwest
Southeast-northwest
Second, determine the center and find the right direction-the key to solving this kind of problem is to find out who is the center.
1, get up in the morning, facing the sun, the front is (east), the back is (west), the left is (north), and the right is (south).
Facing the sunset, your front is (west), your back is (east), your left is (south), and your right is (north).
Facing the north, your front is (North), your back is (South), your left is (West) and your right is (East).
Facing south, your front is (south), your back is (north), your left is (east), and your right is (west).
Second-year math knowledge points finishing related articles;
★ Arrangement of conceptual knowledge points in the first volume of second grade mathematics
★ Sorting out the key knowledge of mathematics in the first volume of the second grade of primary school
★ Knowledge points in the second volume of the second grade math book
★ Knowledge points in the second volume of second grade mathematics published by People's Education Press.
★ The induction of mathematics knowledge points in the first volume of the second grade of primary school
★ Knowledge points of the first volume of second-grade mathematics published by People's Education Press
★ Summary of mathematical knowledge points in the first volume of Senior Two.
★ The arrangement and summary of the knowledge points in the second grade mathematics examination.
★ Second grade mathematics knowledge points
★ Mathematics knowledge points of senior one and senior two.