What is the correct calculation of mathematics in primary school?

The focus of learning can be on:

1.Basic knowledge of clever and quick calculations:

For first-year students, computing is the first problem students encounter when learning. If students can find certain rules in the seemingly disordered equations and simplify the complex, then students will be able to enhance their confidence in learning mathematics and increase their interest in learning mathematics. In addition, computation and quick calculation are the basis for learning various subsequent problems.

To learn mathematics well, you must first pass the calculation level.

2.Recognize and learn to count all kinds of basic shapes:

Squares, cuboids, circles, and cubes are the most common shapes learned in primary school. Through systematic guidance, first-year students are able to calculate the number of various basic figures; It enables students to establish orderly thinking and lay the foundation for the establishment of thinking patterns.

3.Odd and even, unequal and equal of numbers, etc

The problem of number theory is a key point in the follow-up study, and what will be learned in this semester: the odd and even, unequal and equal of numbers will undoubtedly be the basis of future learning, here we will decompose the number theory problem into various types and explain them one by one, so as to make the study of mathematics more systematic.

Year 2: Expand your thinking.

Second-year students should focus on developing good study habits and a good way of thinking for a long time, and this habit is focused on cultivating from an early age.

Children in the second grade are still more malleable in their habits and focus on cultivating good study habits; If you don't pay attention to the bad habits you develop, it will be more difficult to change them when the child is older.

The focus of the study can be on:

1. Calculation: For second-year students, the first problem they encounter is the calculation problem, and the calculation problem is the key and difficult point.

The problem of enumeration requires children's orderly thinking, such as the method of making money with several coins, and integer splitting all belong to the problem of enumeration. This kind of problem not only requires children to be orderly, but also is not intuitive, and it is difficult for children to understand.

It is recommended that parents can visualize more abstract questions.

3. Appropriate contact with application questions:

Many parents of second-grade students hope that their children can achieve good results in exams, and many parents have such questions, should they learn the content of third-grade students, especially the application questions?

It is recommended that children who have spare time can be exposed to some of the problems in the third grade, but not as difficult as in the third grade textbook.

Calculate and check: It is a vertical calculation in the column first, and then a vertical calculation in the opposite column.

For example, addition requires subtraction, and division requires multiplication. Calculate a b c, check c b a, arithmetically, arithmetic, arithmetic, is the act of obtaining a new quantity by knowing the possible combinations of quantities. The essence of an operation is a mapping between sets.

The addition check in primary school mathematics is to use the opposite method of addition and subtraction to check. For example, 12+24=36 then let you check the result by using 36 24 If the result is equal to 12, then the calculation is correct.

Definition. Addition: The operation of merging two numbers into a single number.

Subtraction: The operation of finding another addition in the sum of two known additions and one of them.

Multiplication: The operation of finding the product of two numbers.

Division: The operation of knowing the product of two factors and one of the factors, and finding the other factor.

1.Addition check: You can use addition to check, that is, to exchange the position of 2 additions; You can also use subtraction to subtract an addition to see if the sum equals another addition.

2.Subtraction check: Use the difference plus the subtraction to see if it is equal to the subtracted number, or you can use the subtracted number to see if it is equal to the subtraction.

3.Multiplication check: Swap the positions of the 2 factors to see if the product is equal, or you can divide the product by one factor to see if it is equal to the other factor.

4.Division check: multiply the quotient by the divisor to see if it is equal to the dividend, or divide the dividend by the quotient to see if it is equal to the divisor.

The above 4 types of operations generally have 2 kinds of calculation methods, and you can choose the appropriate method for verification. The check is an important part of the calculation.

In addition operations there is the following expression.

Addition + addition = sum, check: sum - addition = addition.

Multiplier Multiplier = product, check: product Multiplier = multiplier.

Dividend divisor = quotient, check: quotient divisor = dividend.

Elementary mathematics checks include addition, subtraction, multiplication, and division.

First, the addition check:

Check addition: Use the calculated sum and subtract an addition to see if the result is equal to another addition. Swap the positions of the two additions and calculate them again.

Second, subtraction check:

Subtraction check: Does adding or subtracting with the difference equal to the subtracted number. Subtract the difference from the subtracted number to see if it is equal to the subtraction.

3. Multiplication check.

Multiplication check: Divide the product by one multiplier to see if it equals another multiplier. The position of the two multipliers is calculated once.

Fourth, division checking.

Division check: The quotient multiplication divisor is not equal to the dividend. The divisor divided by the quotient, etc., is not equal to the divisor.

If you haven't learned division in elementary school math calculation, it is to change the position of the factor to check. For example, if you start counting 17 15, and in the process of your calculation, you put 15 in front of 15 17.

If you learn division, it is 17 15 = 255, and if you check it, it is 255 15 = 17.

Elementary school verification addition, subtraction, multiplication and division is not the same, just if the subtraction is checked, in the subtraction operation, we can also use the difference plus subtraction for the check.

There are 5 ways to check addition and subtraction:1. Addition is checked by subtraction, such as 17+8=25, and 25-8=17.

2. The addition is checked by multiplication, such as 15+15+15=45, and the calculation is 15x3=45.

3. Subtraction is checked by addition, for example, 87-19=68, 68+19=87.

4. Subtraction is calculated with a mixture of addition and subtraction, such as 54-18=36, and 36+20-2=56-2=54

5. Addition and subtraction are used for mixed calculation, such as 79+89=168, and 168-90+1=78+1=79.

There are two different methods for checking addition and subtraction.

The calculation method of addition: one is to exchange the position of the addition and calculate it again; One is and subtract one addition to equal the other.

The calculation method of subtraction: one is that the difference plus or minus is equal to the subtracted number; One is that the difference between the subtraction is equal to the subtraction.