Summary of mathematics knowledge points in the first grade of primary school
1, number: according to the number of objects, it can be represented by 1 1-20.
2. Sequence: 1 1-20 The sequence is: 1 1, 12, 13, 14, 15,/kloc.
3. Comparison size: comparison can be made according to the order of numbers, and the number at the back is always greater than the number at the front, or according to the composition of numbers.
4. Composition of the number 1 1-20: All of them are composed of 1 tens and several ones, and 20 is composed of two tens.
Such as: 1 ten and five 15.
5. Number of digits: the first digit on the right is one digit, and the second digit is ten digits.
6. 1 1-20 How to read each number: read dozens of digits from high places and several digits. Pronunciation of 20, 20 is pronounced: 20.
7. Write numbers: When writing numbers, write against them. If there are 1 tens, write 1 on the ten, and if there are two tens, write 2 on the ten. If there are several 1, write a few on each bit, and if there is no unit on each bit, write a 0.
8. Ten plus several, ten plus several and the corresponding subtraction.
(1), 10 plus several and the corresponding subtraction calculation method: 10 plus several to get ten, ten minus several to get ten, and ten minus ten to get several.
For example, 10+5= 15,17 =10, 18- 10=8.
(2) Calculation method of ten plus several and corresponding subtraction: When calculating ten plus several and corresponding subtraction, you can use the composition of numbers to calculate, or you can add or subtract the numbers in units of one and then add the whole ten.
(3) Add and subtract the names of each part:
In the addition formula, the numbers before and after the plus sign are called addends, and the numbers after the equal sign are called sums.
In the subtraction formula, the number before the minus sign is called the minuend, the number after the minus sign is called the subtraction, and the number after the equal sign is called the difference.
9. Solve the problem
To find how many numbers are between two numbers, you can use counting method or graph method. You can also use the calculation method (subtract large numbers from 1).
Knowledge points of "interesting graphics" in mathematics for the first grade of primary school
Identify graphics (rectangle, square, triangle and circle)
1, the understanding of rectangle, square, triangle and circle can distinguish four basic graphics.
2, learn to observe, can find out the basic shape of life, will give examples.
3. Be able to distinguish the relationship between face and body and realize that "face is in the body".
4, can find out the rules of a set of graphics.
5, can find out the basic graphics in complex patterns.
Do it by hand (1)
Students can fold, cut and spell their favorite patterns by themselves.
Learn more about plane graphics through origami, cutting and other activities.
Simple graphics are decomposed and repaired by origami.
Hands-on Practice (2)
Understand the composition of jigsaw puzzles. Through the activities of jigsaw puzzles, I am further familiar with the plane graphics I have learned.
A preliminary understanding of parallelogram can only make students intuitively understand the shape and name.
Hands-on operation (3)
By appreciating and designing patterns, we can learn more about squares, rectangles, triangles and circles.
The accumulation of mathematics knowledge points in the first grade of primary school
I. Reading and writing numbers
/kloc-a number between 0/and 20
Ordinal number: from small to large 01234567891121314151665438.
Countdown: in descending order: 20 19 18 17. ...
Singular: 1, 3, 5, 7, 9 ...
Even numbers: 2, 4, 6, 8, 10 ...
(Note: 0 is neither singular nor even, and 0 is even. Odd and even numbers are said in life, and even numbers are said in mathematics. )
2. Two digits
(1) We often meet ten objects as a whole in our life. In fact, ten "1" is one "10" and one "10" is ten "1".
For example, there are (1) tens and (1) ones in a:1;
1 1 has one (1 1).
12 has (1) tens and (2) ones;
12 has (12) 1, 13 has (1) 10 and (3)1;
13 has (13) 1, 14 has (1) 10 and (4)1;
14 has (14) 1, 15 has (1) 10 and (5)1;
15 contains one (15) ...
19 has (1) tens and (9) ones;
In other words, there are (19) 1 in 19 and (2)10 in 20;
There are (20) in 20. B: Look at the number board (1 1~20) and say that the numbers on the board are composed of ten and one.
(2) On the counter, what is the first number from the right? What's the second place? (10) What does 1 bead mean? (stands for 1 one) What does the tenth 1 bead mean? (for 1 10)
(3) Read 1 1, 12, 13, 14, 15, 16, 17,/kloc.
For example: 14, read: 14 and write: 14. The unit digit is 4, which means 4 1, and the tenth digit is 1, which means 1 piece 10.
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