1. per share × number of shares = total number of shares = total number of shares = number of shares = number of shares.

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.

6 addend+addend = sum

And-one addend = another addend

7 minuend-minuend = difference minuend-difference = minuend difference+minuend = minuend

8 factor × factor = product product ÷ one factor = another factor

9 Dividend Divider = quotient divisor = divisor quotient × divisor = dividend

Calculation formula of mathematical graphics in primary schools

1. square

C perimeter s area a side length perimeter = side length ×4

C=4a

Area = side length × side length S=a×a

2. Cubic

V: volume A: surface area of side length = side length× side length× 6s Table =a×a×6 Volume = side length× side length× side length V = a× a× a.

3. Rectangular shape

C perimeter s area a side length perimeter = (length+width) ×2 C=2(a+b) area = length × width S=ab.

4. Cuboid

V: volume s: area a: length b: width h: height (1) surface area = (length× width+length× height+width× height )× 2s = 2 (AB+AH+BH) (2) volume = length× width× height V=abh.

5. Triangle

S area a bottom h height area = bottom x height ÷2 s=ah÷2.

Height of triangle = area ×2÷ base of triangle = area ×2÷ height

6. Parallelogram

S area a bottom h height area = bottom x height s=ah

7. trapezoid

S area a upper bottom b lower bottom h height area = (upper bottom+lower bottom) × height ÷2

s=(a+b)× h÷2

8 laps

S area c perimeter ∏ d= diameter r= radius (1) perimeter = diameter x ∏ = 2 x ∏× radius c = ∏ d = 2 x r (2) area = radius x radius x ∏.

9. Cylinder

V: volume h: height s; Bottom area r: bottom radius c: bottom circumference (1) lateral area = bottom circumference× height (2) surface area = lateral area+bottom area× 2 (3) volume = bottom area× height (4) volume = lateral area ÷2× radius.

10. Cone

V: volume h: height s; Bottom area r: the formula of the sum and difference problem of bottom radius volume = bottom area × height ÷ 3; Total number ÷ Total number of copies = average (sum+difference) ÷ 2 = large number (sum-difference) ÷ 2 = decimal and multiple problems and ÷ (multiple-1) = decimal × multiple = large number.

(or sum-decimal = large number) Difference multiple problem ÷ (multiple-1) = decimal decimal × multiple = large number (or decimal+difference = large number)