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).
The knowledge point of "understanding numbers within 100" in senior one mathematics.
1, from the right, the first digit is one, the second digit is ten, and the third digit is one hundred.
Reading and writing methods: both reading and writing should start from the high position.
2. Singular number: a natural number with the unit of 1, 3,5,7,9.
3. Even numbers: natural numbers with units of 0, 2, 4, 6 and 8 (except 0).
4. Integer: a natural number with the unit of 0 (except 0).
Five tens and five ones make fifty-five. (Five decimal places means five tens, and five decimal places means five ones. )
Reading: 55 (writing Chinese characters) Writing: 55 (writing mathematical characters)
6, 10 one is ten, 10 ten is one hundred. (One, ten and hundred are counting units. Write Chinese characters)
Composition of numbers: (Pay attention to different ways of asking questions)
Example: 68 consists of 6 tens and 8 ones; 68 consists of 8 1 and 6 10.
There are (6) tens and (8) ones, and (68) ones.
The decimal digit is 6, which means 6 tens (writing Chinese characters), and the unit digit is 8, which means 8 ones (writing Chinese characters).
7. The method of comparing the size of two digits: look at the ten digits first, and the bigger the number, the bigger it will be. If the ten digits are the same, if you look at one digit, it will be bigger. (The opening faces a large number and the tip faces a decimal number. )
8. When the difference between the two quantities is large, it can be described as "much more, much less"; When there is little difference between the two quantities, it can be described as "more, less".
9. The smallest three digits are100; The two digits of are 99; The smallest two digits are10; One digit of is 9; The smallest number is 1.
Summary of mathematics addition and subtraction in the first grade of primary school
one
1 first look at the children's math textbooks, from which you can know how children learn. Don't just teach children in your own way. If the child has a strong understanding, he may accept it. If it is similar, the child will only be more confused.
2, talk to children more, let children understand what is addition and subtraction, addition and subtraction can be taught by giving children toys, giving children a toy is addition, and taking a toy is subtraction. Children's understanding of addition and subtraction can penetrate into daily life.
3. Talk to your child more when you do the questions, find out what questions he doesn't understand, specific to a certain type of questions, and then explain such questions more. In the process of talking about the topic, be patient, and don't criticize the child or call him stupid just because he doesn't understand. This is the least desirable.
4, usually encourage children, exercise children's understanding ability, and also improve children's concentration. Children may not know, but they don't listen carefully in class, which leads to failure to keep up with the course and loss of confidence.
two
1, it is more complicated to make arithmetic easy before it is difficult, but it is difficult for children to accept if they are taught difficult arithmetic from the beginning. Parents can integrate life into their children's math study.
2. Remember large numbers in your mind, add and subtract decimals: remember large numbers in your mind and count up decimals, for example, 4+2= remember 4, count up 5 and 6, and then get the result: 4+2=6 Subtraction: remember large numbers in your mind and count down decimals, for example, 6-3= remember 6, count down 3, 5, 4, 3, and so on.
3. Use decomposition skills to teach children from the beginning of decomposition and combination. At the same time of division, use language to express. Be sure to say it with your mouth. The child who can speak out means that she really has it. Start with less than 5. Let's talk about decomposition 2 first. Remember to put them together after each separation.
4. The first thing to remember is that 10 plus a few equals 10, such as10+1=1/kloc-0+2 =12. The second thing to remember is1+1= 2,2+2 = 4,3+3 = 6,4+4 = 8,5+5 =10,6+6 =12,7+7.
three
1, first review the subtraction within ten and then transition to the integer subtraction operation of multiples of ten. For example, 5-2=, 8-4=, etc. The child will tell the answer immediately and then give formulas such as 50-20= and 80-40=. If the child is hesitant, you can ask the child to do it by comparing questions, such as 5-2=, 50-20=, 8-4=, 80-40= and so on.
2. Learn to split numbers. For example, 23 can be divided into 20 and 3, 59 can be divided into 50 and 9 and so on. If the child doesn't understand, you can do this. Test the child 20+3= first, and the answer is 23. How does 23 break down into 20 and a few? Similar training should be repeated many times.
3. Learn the large number reduction algorithm within 100. First, I can be familiar with positive numbers or numbers that count backwards within 100 from anywhere. Second, I can understand the basic algorithm of subtraction. Addition counts backwards, subtraction counts forward. It is strange that children can count their fingers when adding and subtracting within ten, but if they count more, they are often at a loss. Parents should teach them. If the child studies hard, it won't be long before he can give an answer without counting his fingers.
4. Finally, teach children the method directly. After mastering the above steps, you can directly teach your child the subtraction formula within 100. For example, 70-46=, the child may not think of it at once, so ask the child, how much can 46 be divided into? Children will say 40 and 6, so how much is 70 MINUS 40? The child will say that the answer is 30, so what is 30 MINUS 6? The child feels simple.
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