The arithmetic progression formula for primary schools is as follows:

I. arithmetic progression Formula

1, sum = (first item+last item) x number of items+2;

2. Number of items = (last item-first item) 10 tolerance+1;

3. The first item =2 and the number of six items-the last item;

4. The last project = the first project+(project number-1)X tolerance.

Second, the graphic calculation formula

1, squared

C: circumference; S: area; A: The length of the side.

Perimeter = side length x4;

C=4a .

Area = side length × side length;

S=axa .

2. Cubic

V: volume; A: The length of the side.

Surface area = side length x side length x6;

S table = = =axax6.

Volume = side length × side length × side length;

V=axaxa .

3. rectangular

C: circumference; S: area; A: The length of the side.

Perimeter = (length+width) x2;

C=2(a+b).

Area = length × width;

S=ab .

4. Cuboid

V: volume; S: area; A: Dragon; B: width; H: high.

(1) surface area (length× width+length× height+width× height) x2;

S=2(ab+ah+bh).

(2) Volume = length × width × height;

V=abh .

5. Triangle

S: area; A: At the bottom; H: high.

Area = bottom x height+2;

s=ah+2 .

Height of triangle = area x2+ base;

Triangle base = area x2+ height;

6. Parallelogram

S: area; A: At the bottom; H: high.

Area = bottom x height;

S = ah.