Summary of mathematics knowledge points in the first grade of primary school
Summary of knowledge points
1. location: the place where you are or occupy, which can be divided into up and down, front and back, left and right.
2.Up: position nouns, such as the car is on the road.
3. Down: nouns of orientation, such as the ship under the bridge.
4. Front: nouns of position and orientation.
For example, Zhang San is in the front of Li Si, so it can be said that Zhang San is in front of Li Si.
5. After: position and orientation nouns.
For example, Li Si is behind Zhang San, so it can also be said that Li Si is behind Zhang San.
7. abdication subtraction: the subtraction operation that must borrow from the high position.
Subtraction of abdication within 8.20:
Subtraction between numbers within 20 gives way. For example: 12-9=3.
9. Graphic components:
Brief introduction to the key knowledge of senior one mathematics: 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 and sphere.
Second, the combination of graphics.
1. Two identical triangles can be combined into a parallelogram; Two identical triangles can be put together.
Make it into a parallelogram, rectangle or 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.
Two rectangles can form a big rectangle. Two special rectangles can form a big square.
Four cuboids can form a big cuboid.
Mathematics knowledge points in the second volume of the first grade of Beijing Normal University Edition
Numbers in life
1, counting methods are:
One by one, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, ...
Two numbers, 1, 3, 5, 7, 9,1,13, 15, 17, 19 … or 2, 4.
Five numbers are five, five, 10, 15, 20, 25, 30, 35, 40. ...
Ten numbers,10,20,30,40,50,60,70, ...
2. Numbers, cardinality and ordinal numbers
The third number from the right on the counter is one hundred digits. Number names are from right to left: single digit, ten digit and hundred digit, and the progressive rate between two adjacent counting units is 10.
Numbers: The specific position occupied by each number in a number, such as single digits, tens digits and hundredths digits.
Cardinality: Indicates the number of objects, for example, 8 apples.
Ordinal number: indicates the position of the element in the sequence, for example, 1.
3, the understanding of two digits
Two digits consist of ten and one. The number on the decimal point indicates how many tens there are, and the number on the decimal point indicates how many ones there are.
For example, the decimal digit of 95 is 9, representing 9 tens, and the digit is 5, representing 5 ones.
10 Ten is one hundred. 100 has 10 tens, 100 has 100 ones.
The two digits of are 99, and the smallest two digits are 10.
The smallest three digits are 100.
87 read: 87; 94 Writing: 94
4. Compare the sizes of numbers
Different digits: Compare the sizes of digits. First of all, the digits with more digits are larger, such as 28>9.
Same number of digits: Numbers with the same number of digits should be compared in turn from the high position. If it is a two-digit size, look at the ten digits first, and the number of ten digits is large; Ten digits are the same. If you look at a single digit, the number of a single digit is large, such as 94 >; 9 1.
Others: 75 is much more than 23; 54 is greater than 49; 2 1 much less than 56; 37 is less than 41; 62 is similar to 6 1.
Summarize the relevant articles about the knowledge points of mathematics in grade one;
★ Summary of compulsory knowledge points in first grade mathematics.
★ The key points of mathematics learning in senior one are excellent.
★ Summary of difficulties and learning methods of mathematics knowledge points in senior one.
★ Encyclopedia of Mathematics Learning Methods in Different Grades
★ Guidance of mathematics learning methods in the first grade of primary school
★ induction of mathematics test sites in the first grade of primary school
★ Summarize the knowledge points of the final size of the first grade mathematics.
★ First-year mathematics knowledge points
★ Learn the knowledge points of the first volume of mathematics in senior one.
★ Summary of primary school mathematics knowledge points