Second grade:
1, multiplication formula table (for example: 2 × 2 = 4).
2. The associative law of addition and subtraction:
(a + b)+ c = a +(b + c).
3, addition and subtraction exchange law:
a + b = b + a，a - b ≠ b - a .
Third grade:
1, area formula:
Rectangular area = length × width, triangular area = bottom × height ÷ 2? .
2, perimeter formula:
Rectangular perimeter = (length+width) ×2, and triangular perimeter = side 1+ side 2+ side 3.
Fourth grade:
1, decimal to decimal:
Named molecule
2. Least common multiple:
The least common multiple of a and b is a× b ÷ (the greatest common divisor of a and b).
3. The greatest common divisor (GCD):
The greatest common divisor of a and b is the largest positive integer that can divide a and b simultaneously.
Fifth grade:
1, Pythagorean theorem of triangle;
c？ = a？ + b？ (where c is the hypotenuse and a and b are two right angles).
2. Percentage formula:
Percentage = (occupied quantity/total quantity) × 100%.
Sixth grade:
1, formula of area and perimeter of circle:
Area = π× radius? , perimeter = 2 × π × radius.
2, tabulation method for the maximum:
In all the data, find the law, make a table, and find the maximum (or minimum) value according to the table.
3. Division of large numbers:
How to calculate the division with large divisor vertically?
The above are just some commonly used formulas collected. Primary school mathematics has a wide range of knowledge, including many mathematical concepts and relationships.
The significance of primary school mathematics formula;
1, providing basic knowledge:
These formulas provide students with basic knowledge of mathematics and help them understand and solve various mathematical problems. Formulas are the basis of learning mathematics and lay a solid foundation for students.
2. Calculate and solve problems:
These formulas enable students to perform basic mathematical calculations, such as addition, subtraction, multiplication and division. They also help students solve various practical problems, such as calculating the area and perimeter of a graph and converting fractions into decimals.
3, cultivate logical thinking:
Learning and applying mathematical formulas requires certain logical thinking ability. In the process of solving problems, students need to observe and analyze problems, find appropriate formulas and apply them to get correct answers.
4. Establish mathematical concepts and relationships:
By learning these formulas, students will have a deeper understanding of different mathematical concepts and relationships. For example, by studying and applying the Pythagorean theorem of triangles, students can understand the relationship among the three sides in a right triangle.