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

Multiply of 2.65438+multiple of 0× 65438 +0, number of copies per share × number of copies = number of times of 2,65438 per share+number of times of 0× number of times of 65438 +0 = number of times of times/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. Appendix+Appendix = sum, and-one addend = another addend.

7. Minus-Minus = Minus-Minus = Minus+Minus = Minus

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

9. Dividend = quotient dividend = divisor quotient × divisor = dividend

Calculation formula of mathematical graphics in primary schools

1, squared: c perimeter s area a side length perimeter = side length× 4c = 4a area = side length× side length s = a× a.

2. Cube: v: volume A: side surface area = side length× side length× 6s table =a×a×6 volume = side length× side length× side length v = a× a× a.

3. Rectangle: 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 c: height

(1) surface area (length× width+length× height+width× height )× 2s = 2 (AB+BC+CA)

(2) volume = length× width× height V=abc

5. triangle s area a base h height area = base × height ÷2 s=ah÷2 triangle height = area ×2÷ base triangle base = 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 circle: s plane, c circumference ∏ d= diameter, r= radius.

(1) circumference = diameter×π = 2×π× radius C=πd=2πr

(2) Area = radius × radius× π

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 bottom radius volume = bottom area x height÷ 3.

Total number ÷ Total number of copies = average value

The formula of sum and difference problem (sum+difference) ÷2= large number (sum-difference) ÷2= sum and multiple problem ÷ (multiple-1) = decimal × multiple = large number (or sum-decimal = large number).

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

Profit = selling price-cost profit rate = profit/cost×100% = (selling price/cost-1) × 100% fluctuation amount = principal× fluctuation percentage discount = actual selling price×100. 1) interest = principal × interest rate × time interest after tax = principal × interest rate × time × (1-20%)

Length unit conversion 1 km =1000m1m =1decimeter1decimeter =10cm100cm/kloc.

Volume (volume) unit conversion

1 m3 = 1000 m3 1 m3 = 1000 cm3 1 m3 = 1 liter 1 m3 = 1 ml/kloc-.

Weight unit conversion

1t =1000kg1kg =1000g1kg =1kg RMB unit conversion.

1 yuan = 10 angle 1 angle = 10 minute 1 yuan = 100 minute time unit conversion.

1 century = 100 1 year = 1 February (3 1 day) has:1\ 3 \ 5 \ 7 \ 8 \1.