First, the perimeter formula
1. Perimeter of rectangle = (length and width) ×2
2. The circumference of a square = side length ×4
3.？ (Key) The circumference of a circle = π× diameter? = 2×π× radius
Second, the area formula
1. Area of rectangle = length × width
2. Area of a square = side length × side length
3.？ Area of triangle = base × height ÷2
4. Area of parallelogram = base × height
5. Trapezoidal area = (upper bottom and lower bottom) × height ÷2
6. Area of (key) circle = π× radius 2
7. (Key) lateral area of the cylinder: lateral area of the cylinder is equal to the perimeter of the bottom multiplied by the height.
8. (Key) Cylinder surface area: Cylinder surface area = bottom area+side area.
Third, the volume formula
1. cuboid volume = length× width× height
2. The volume of the cube = side length × side length × side length
3. (Key) Volume of the cylinder: The volume of the cylinder is equal to the bottom area multiplied by the height.
4. (key)? Volume of cone = bottom area × height.
The Significance of Primary School Mathematics Curriculum Standards
1, guiding role
The concepts and objectives of mathematics curriculum put forward in this standard have guiding significance for mathematics curriculum teaching in compulsory education stage, and the selection of teaching content and the organization of teaching activities should also follow these concepts and objectives.
2. Promote students' all-round, sustained and harmonious development.
We should not only consider the characteristics of mathematics itself, but also follow the psychological laws of students' learning mathematics, emphasizing that starting from students' existing life experience, students should abstract practical problems into mathematical models through personal experience and explain and apply them, so that students can make progress and development in many aspects such as thinking ability, emotional attitude and values.
3. Mathematics is an important part of human culture.
Mathematics literacy is the basic quality that every citizen in modern society must have. Mathematics education is an important part of promoting students' all-round development education. It not only enables students to master the mathematical knowledge and skills needed for modern life and study, but also plays an irreplaceable role in cultivating people's rational thinking and innovative ability.