Unit 1: unit of length
1, ruler is a tool for measuring length.
2. For objects with relatively short mass, the unit can be "cm", and cm can be expressed as "cm".
3. Point the scale 0 of the ruler to the left end of the object, and then look at the right end of the object to know the length of the object.
For a large object, the unit is usually "meter". The meter can be represented by "m".
5、 1m = 100cm； 1m = 100cm； 1 m has (100) 1 cm.
6. The line segment is straight, its length can be measured, and it has two endpoints.
7. Master the method of drawing lines.
Unit 2: Addition and subtraction within 100
1, pen calculation (column vertical calculation) addition, the same digits should be aligned, starting from single digits, each digit adds up to ten, and enter 1 to the tenth digit.
2. When using pen subtraction (column vertical calculation), the same digits should be aligned. If the number of digits is reduced by one, the number of digits is not enough, and the number of digits is reduced by ten 1.
3. When calculating columns vertically, carry symbols (small 1) and abdication symbols (small dots) cannot be omitted.
Unit 3: A Preliminary Understanding of Angle
1, a corner has 1 vertices and 2 edges.
2. Starting from one point, draw two straight lines and an angle in different directions with a ruler.
3. There is a right angle on each triangular ruler, and there are two acute angles on each triangular ruler.
Judgment: You can spell a right angle with a pair of triangles. (×)
4. The obtuse angle is greater than the right angle, and the acute angle is less than the right angle.
5. The size of the angle has nothing to do with the side length, but with the opening size of the angle.
Judgment: Look at an angle with a magnifying glass, and the angle becomes larger. (×)
Unit 4: Table Multiplication (1)
The addition of 1 and the same addend can be expressed by multiplication.
2. Seven twos
Addition formula: 2+2+2+2+2 =14.
Multiplication formula: 2×7= 14 Read 2 times 7 equals 14.
Or: 7×2= 14 read 7 times 2 equals 14.
3. Multiplier × Multiplier = Product
Addition of (1) 2 4: 2×4=8.
(2) Multiplication of two fours: 4×4= 16
(3) Product of 2 and 4: 2×4=8
4. Multiplication formula of1-6
(1) can remember multiplication formula;
(2) Be able to write the meaning of the multiplication formula, express the addition of several numbers, and show it graphically.
(3) Can write multiplication formula according to multiplication formula.
(4) Write the multiplication formula according to the addition formula.
Unit 5: Observing Objects (1)
1. Through observation and comparison, I initially learned that the shapes of objects observed from different positions are different, and I learned to correctly judge the observer's position according to the different shapes I saw.
2. One side of the three-dimensional figure you see is a square. This three-dimensional figure may be a cube or a cuboid.
Unit 6: Intra-table Multiplication (2)
Multiplication formula of 1 and 7-9
(1) can remember multiplication formula;
(2) Be able to write the meaning of the multiplication formula, express the addition of several numbers, and show it graphically.
(3) Can write multiplication formula according to multiplication formula.
Unit 7: Know the Time
1. There are 12 big squares on the clock face, each big square has 5 small squares, and there are 60 small squares on the clock face.
2. Walking once an hour is 12 hours, and walking once a minute is 60 minutes.
3, the minute hand walks once, and the hour hand walks 1.
1 hour =60 minutes, one moment = 15 minutes, and half an hour =30 minutes.
4. Full time and half time
Hour time: the minute points to 12, and the hour hand points to the number.
Half an hour: the minute points to 6, and when the hour hand passes the number, it is half an hour.
5, the calculation of time
Addition calculation of time:
Find out how many minutes the past few minutes are, and calculate by addition.
When calculating, points will be added every hour. If it exceeds 60, go ahead 1.
Subtraction calculation of time
How long is the time between when and when? To use subtraction, subtract the start time from the end time.
When calculating, the time is reduced and the points are reduced. If it is not reduced enough, it will retreat to the previous position at 60 1.
Unit 8: Mathematical Wide-angle Configuration (1)
1, according to the situation of the problem, list all the possibilities in an orderly way, with no weight missing.
2. Some problems should be considered in the arrangement order.
Question 1: 1, 2 and 6 can form (8) two-digit numbers.
12、 16、2 1、26、6 1、62、9 1、92
Question 2: Three numbers (1, 2,6) can form (6) two-digit numbers.
12、 16、2 1、26、6 1、62
Question 3: There are nine ways to put two clothes in three different boxes.
Put one dress in a box and two clothes in a box.
Question 4: There are three coins (1, 5, 1 yuan) that can make up (7) kinds of currency values.
Divided into 1 block, 2 blocks and 3 blocks.
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3. Sorting out the key and difficult points of primary school mathematics knowledge points in all grades.
4. Summarize the learning methods of mathematics in the second grade of primary school.
5. Summary of the learning methods and difficulties of the second grade mathematics.
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