People's Education Press Primary School Grade One Volume II Mathematics Unit 1 Knowledge Point: Understanding Graphics
A, graphics can be divided into (1) plane graphics.
(2) Three-dimensional graphics
1. Plane graphics: square, rectangle, triangle, circle, parallelogram.
2, three-dimensional graphics: cuboid, cube, cylinder, sphere.
Second, the combination of graphics.
1, two identical triangles can be combined into a parallelogram; Two identical triangles can be combined into a parallelogram, a rectangle or a large triangle.
2. It takes at least 4 small cubes to form a big cube, and at least 8 small cubes to form a big cube.
3. Two rectangles can form a big rectangle. Two special rectangles can form a big square.
Four cuboids can form a big cuboid.
Knowledge points of the first unit of mathematics in the first grade of primary school in West Normal University: understanding of the number within 100
1, can read and write numbers within 100, master the composition of numbers, say every digit within 100 and the arrangement order of these numbers, identify the meaning of numbers on each digit, express the number of objects with numbers within 100, master the order of numbers, and compare the sizes of numbers. 2. Understand the elements, angles and minutes, understand the decimal relationship between them, and make simple conversion and application.
3. Addition and subtraction will not be performed within100. It can vertically calculate the carry addition of two digits plus two digits and the abdication subtraction of two digits minus two digits, and can perform the mixed operations of addition, subtraction and addition and subtraction within 100.
4. Know the clock face, hour hand and minute hand, master the expression of the hour, half an hour and approximate time on the clock face, and be able to identify and read these times.
5, can identify the front, back, left, right, up, down and other directions, and use these directions to describe the relative position of the object, which group of lines can be used to describe the relative position of the object, and can identify the shape of a simple object viewed from the front, back and side.
6. Be able to recognize squares, squares, triangles and circles, initially perceive the connections and differences between some simple plane graphics and three-dimensional graphics, and use these plane graphics to make puzzles. Can understand these simple numbers in life.
7. Be able to compare, arrange and classify objects according to a given standard or choose a certain standard. In the activities of comparison, arrangement and classification, experience the hunger consistency of the results of activities under the same standard, and learn to find the * * * nature of simple plane graphics.
8. Understanding pictographic statistical charts can be classified simply according to the needs of statistics, can be classified simply according to the needs of statistics, can ask and answer simple mathematical questions according to the data of statistical charts, and can carry out some of the simplest statistical activities in life.
Beijing normal university printing plate primary school grade one volume 1 mathematics unit 1 knowledge point: mathematical addition and subtraction
Add up two numbers. Appendix+Appendix = and: 3+ 13= 16, where 3 and 13 are addends and the sum is 16. Take a part from a number and find out how much is left. Subtract. Minus-Minus = Difference: 19-6= 13, where 19 is the minuend, 6 is the subtraction, and the difference is 13.
20-bit decimal addition formula table
9+ 1= 10 8+2= 10 7+3= 10 6+4= 10 5+5= 10 4+6= 10 3+7= 10 2+8= 10 1+9= 10
9+2= 1 1 8+3= 1 1 7+4= 1 1 6+5= 1 1 5+6= 1 1 4+7= 1 1 3+8= 1 1 2+9= 1 1
9+3= 12 8+4= 12 7+5= 12 6+6= 12 5+7= 12 4+8= 12 3+9= 12
9+4= 13 8+5= 13 7+6= 13 6+7= 13 5+8= 13 4+9= 13
9+5= 14 8+6= 14 7+7= 14 6+8= 14 5+9= 14
9+6= 15 8+7= 15 7+8= 15 6+9= 15
9+7= 16 8+8= 16 7+9= 16
9+8= 17 8+9= 17
9+9= 18
1, remember the addition and subtraction within 20 (carry addition within 20, abdication subtraction within 20)
Subtraction formula of abdication within 20 years
10- 1=9 1 1-2=9 12-3=9 3-4=9 14-5=9 15-6=9 16-7=9 17-8=9 18-9=9
10-2=8 1 1-3=8 12-4=8 13-5=8 14-6=8 15-7=8 16-8=8 17-9=8
10-3=7 1 1-4=7 12-5=7 13-6=7 14-7=7 15-8=7 16-9=7
10-4=6 1 1-5=6 12-6=6 13-7=6 14-8=6 15-9=6
10-5=5 1 1-6=5 12-7=5 13-8=5 14-9=5
10-6=4 1 1-7=4 1 2-8=4 13-9=4
10-7=3 1 1-8=3 12-9=3
10-8=2 1 1-9=2
10-9= 1
2. When looking at the picture to solve the problem, we should use the known conditions in the picture to formulate correctly.
Commonly used relationships are:
(1) number of parts+number of other parts = total.
(2) Total number of parts = number of other parts
(3) Large number-decimal number = who is more than who, or who is less than who.
Find the addition of large numbers. Subtraction of decimal or phase difference sequence.
(4) Original-Borrow = How much is left, and how much is left by column subtraction.
3. When solving application problems, we should formulate them correctly according to the known conditions.
(1) Total score relationship (addition and subtraction)
Number of Parts+Number of Other Parts = Total-Number of Parts = Number of Other Parts
(1) when "a * * *, * *, full-length, original, etc." Appears in the question to indicate the total, the column is added.
(2) Column subtraction when there is "surplus, surplus, surplus, first time, second time, used up, finished eating, etc.". In question.
(2) Size relation (addition and subtraction)
Large Number-Decimal Number = Difference Number
Large number-Difference = Decimal number
Decimal+difference = large number
The number after the word "more" or "less" is the difference.
② The numbers on the left and right sides of the word "Bi" are large numbers and decimals respectively.
Find the addition of large series and the subtraction of decimal or difference series.