Elementary school math? What is the point? In fact, it is very simple, as long as you understand it in class.

There are three key points.

One is algebra, the other is plane geometry and solid geometry, and the third is statistics and some miscellaneous problems.

Algebra mainly includes equations, and there are some mathematical foundations, such as the composite number of prime numbers, especially equations, which should be reviewed emphatically.

Plane geometry mainly includes the basic figures in primary schools, and we should also remember basic concepts, such as what triangle has a stable shape and recite formulas. The most important thing is flexibility.

Solid geometry, a difficult point in primary school, is recommended to do more problems.

Statistics, etc. These are very simple, you can have a simple look.

1, the perimeter of the rectangle = (length+width) ×2 C=(a+b)×2.

2. The circumference of a square = side length ×4 C=4a.

3. Area of rectangle = length× width S=ab

4. Square area = side length x side length s = a.a = a.

5. Area of triangle = base × height ÷2 S=ah÷2.

6. parallelogram area = bottom x height S=ah

7. trapezoidal area = (upper bottom+lower bottom) × height ÷ 2s = (a+b) h ÷ 2.

8. Diameter = Radius× 2D = 2r Radius = Diameter ÷2 r= d÷2

9. The circumference of a circle = π× diameter = π× radius× 2c = π d = 2π r.

10, circular area = pi × radius× radius? =πr

1 1, the surface area of a cuboid = (length× width+length× height+width× height) × 2.

12, cuboid volume = length× width× height V =abh.

13, the surface area of the cube = side length × side length× ×6 S =6a.

14, volume of cube = side length x side length x side length v = a.a.a = a.

15, lateral area of cylinder = circumference of bottom circle × height S=ch.

16, surface area of cylinder = upper and lower bottom area+side area.

s = 2πr+2πRH = 2π(d÷2)+2π(d÷2)h = 2π(c÷2÷π)+Ch

17, cylinder volume = bottom area × height V=Sh

V=πr h=π(d÷2) h=π(C÷2÷π) h

18, volume of cone = bottom area × height ÷3.

v = sh÷3 =πr h÷3 =π(d÷2)h÷3 =π(c÷2÷π)h÷3

19, cuboid (cube, cylinder)

1, number of copies × number of copies = total number of copies/number of copies = total number of copies/number of copies = number of copies.

2. 1 multiple× multiple = multiple1multiple = multiple/multiple = 1 multiple

3. Speed × time = distance/speed = time/distance/time = speed

4. Unit price × quantity = total price ÷ unit price = total quantity ÷ quantity = unit price

5. Work efficiency × working hours = total workload ÷ work efficiency = working hours ÷ total workload ÷ working hours = work efficiency.