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Primary school mathematics public test table
List of primary school mathematical formulas

I. Basic issues

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.

6. Appendix+Appendix = sum- 1 addend = another 1 addend.

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

8. Factor × factor = product present 1 factor = another1factor.

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

Two. Calculation formula of mathematical graphics in primary schools

1, squared

Perimeter area side length

Perimeter = side length ×4 C=4a

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

2. Cubic

Volume a: edge length

Surface area = side length × side length× 6 s Table =a×a×6

Volume = side length × side length × side length v = a× a× a.

3. rectangular

Perimeter area side length

Circumference = (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 × height ÷2 s=ah÷2

Height of triangle = area ×2÷ base.

Triangle base = area ×2÷ height

6. Parallelogram

S area a bottom h height

Area = bottom × height s=ah

7. trapezoidal

Height of upper bottom b and lower bottom h in s area a

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

8, round

Area c perimeter d= diameter r= radius

(1) perimeter = diameter ×∏=2×∏× radius C=∏d=2∏r

(2) area = radius × radius×∈

9. Cylinder

V: volume h: height s; Bottom area r: bottom radius c: bottom perimeter

(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 × height ÷3

Total number ÷ Total number of copies = average value

Three. Formula of sum and difference problem

(sum+difference) ÷ 2 = large number

(sum and difference) ÷ 2 = decimal

Four. And folding problems.

Sum \ (multiple+1) = decimal.

Decimal × multiple = large number

(or sum-decimal = large number)

Five. Difference problem

Difference ÷ (multiple-1) = decimal

Decimal × multiple = large number

(or decimal+difference = large number)

Six. Tree planting problem

1. The problem of planting trees on unclosed lines can be mainly divided into the following three situations:

(1) If trees are planted at both ends of the non-closed line, then:

Number of plants = number of nodes+1 = total length-1.

Total length = plant spacing × (number of plants-1)

Plant spacing = total length ÷ (number of plants-1)

2 If you want to plant trees at one end of the unclosed line and not at the other end, then:

Number of plants = number of segments = total length ÷ plant spacing

Total length = plant spacing × number of plants

Plant spacing = total length/number of plants

(3) If no trees are planted at both ends of the non-closed line, then:

Number of plants = number of nodes-1 = total length-1.

Total length = plant spacing × (number of plants+1)

Plant spacing = total length ÷ (number of plants+1)

2. The quantitative relationship of planting trees on the closed line is as follows

Number of plants = number of segments = total length ÷ plant spacing

Total length = plant spacing × number of plants

Plant spacing = total length/number of plants

Seven. The question of profit and loss

(Profit+Loss) ÷ Difference between two distributions = number of shares participating in distribution.

(Big profit-small profit) ÷ Difference between two distributions = number of shares participating in distribution.

(big loss-small loss) ÷ The difference between two distributions = the number of shares participating in the distribution.

Eight. encounter a problem

Meeting distance = speed × meeting time

Meeting time = meeting distance/speed and

Speed Sum = Meeting Distance/Meeting Time

Nine. Catch up with the problem

Catch-up distance = speed difference× catch-up time

Catch-up time = catch-up distance ÷ speed difference

Speed difference = catching distance ÷ catching time

With Tenuto tap water problem

Downstream velocity = still water velocity+current velocity

Countercurrent velocity = still water velocity-current velocity

Still water velocity = (downstream velocity+countercurrent velocity) ÷2

Water velocity = (downstream velocity-countercurrent velocity) ÷2

Eleven. Concentration problem

Solute weight+solvent weight = solution weight.

The weight of solute/solution × 100% = concentration.

Solution weight × concentration = solute weight

Solute weight-concentration = solution weight.

Twelve. Profit and discount problem

Profit = selling price-cost

Profit rate = profit/cost × 100% = (selling price/cost-1) × 100%.

Up and down amount = principal × up and down percentage

Discount = actual selling price ÷ original selling price× 1 00% (discount <1)

Interest = principal × interest rate× time

After-tax interest = principal × interest rate × time × (1-20%)

Profit 1* quantity 1+ profit 2* quantity 2= total profit.

Thirteen. Length unit conversion

1 km =1000m1m =1decimeter/decimeter =10cm1m =10cm/kloc-.

Fourteen regional unit conversion

1 square kilometer = 100 hectare 1 hectare = 10000 square meter 1 square meter = 100 square decimeter.

1 dm2 = 100 cm2 1 cm2 = 100 mm2

Fifteen. Volume (volume) unit conversion

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

Sixteen years old. Weight unit conversion

1t = 1000kg 1kg = 1000g 1kg = 1kg。

Seventeen. arithmetic series

Sum of series = (first item+last item) × number of items ÷2

The last term = the first term+(number of terms-1) × tolerance.

Number of items = (last item-first item) ÷ tolerance+1