? 1? square

C circumference? Section s? length of a side

Perimeter = side length ×4

C=4a

Area = side length × side length

S=a×a

2? cube

V: 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? rectangle

C circumference? Section s? length of a side

Circumference = (length+width) ×2

C=2(a+b)

Area = length × width

S=ab

4? Cubic

V: volume? Student: Area? A: Long? b:？ Wide? tall

(1) Surface area (L× W+L× H+W× H) ×2

S=2(ab+ah+bh)

(2) Volume = length × width × height

V=abh

5? triangle

Section s? A bottom? H height

Area = bottom × height ÷2

s=ah÷2

Height of triangle = area? × 2 base

Triangle base = area? × 2 Current height

6? parallelogram

Section s? A bottom? H height

Area = bottom × height

S = ah

7? trapeziform

Section s? A at the bottom? B bottom? H height

Area = (upper bottom+lower bottom) × height ÷2

s=(a+b)×？ h \u 2

8? Round; circular

Section s? C circumference? ∏? D= diameter? R= radius

(1) circumference = diameter ×∏=2×∏× radius

C=∏d=2∏r

(2) area = radius × radius×∈

9? cylinder

V: volume? H: high? s； Bottom area? R: bottom radius? C: perimeter of bottom surface

(1) Transverse 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: high? s； Bottom area? R: bottom radius

Volume = bottom area × height ÷3

1? Number of copies × number of copies = total number of copies

Total copies/number of copies = number of copies

Total copies/number of copies = number of copies

2? 1 multiple × multiple = multiple

Multiply1Multiply = Multiply

Multiply/Multiply = 1 Multiply

3? Speed × time = distance

Distance/speed = time

Distance/time = speed

4? Unit price × quantity = total price

Total price/unit price = quantity

Total price ÷ quantity = unit price

5? Work efficiency × working hours = total workload.

Total amount of work ÷ work efficiency = working hours

Total workload ÷ working time = working efficiency

6? Appendix+Appendix = Sum

And-one addend = another addend

7? Negative-negative = difference

Negative difference = negative

Difference+Minus = Minus

8? Factor × factor = product

Product ÷ One factor = another factor

9? Dividend = quotient

Dividend = divisor

Quotient × Divider = Divider

Calculation formula of mathematical graphics in primary schools

1? square

C circumference? Section s? length of a side

Perimeter = side length ×4

C=4a

Area = side length × side length

S=a×a

2? cube

V: 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? rectangle

C circumference? Section s? length of a side

Circumference = (length+width) ×2

C=2(a+b)

Area = length × width

S=ab

4? Cubic

V: volume? Student: Area? A: Long? b:？ Wide? tall

(1) Surface area (L× W+L× H+W× H) ×2

S=2(ab+ah+bh)

(2) Volume = length × width × height

V=abh

5? triangle

Section s? A bottom? H height

Area = bottom × height ÷2

s=ah÷2

Height of triangle = area? × 2 base

Triangle base = area? × 2 Current height

6? parallelogram

Section s? A bottom? H height

Area = bottom × height

S = ah

7? trapeziform

Section s? A at the bottom? B bottom? H height

Area = (upper bottom+lower bottom) × height ÷2

s=(a+b)×？ h \u 2

8? Round; circular

Section s? C circumference? ∏? D= diameter? R= radius

(1) circumference = diameter ×∏=2×∏× radius

C=∏d=2∏r

(2) area = radius × radius×∈

9? cylinder

V: volume? H: high? s； Bottom area? R: bottom radius? C: perimeter of bottom surface

(1) Transverse 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: high? s； Bottom area? R: bottom radius

Volume = bottom area × height ÷3

Total number ÷ Total number of copies = average value

Formula of sum and difference problem

(sum+difference) ÷ 2 = large number

(sum and difference) ÷ 2 = decimal

And folding problems.

Sum \ (multiple-1) = decimal

Decimal × multiple = large number

(or? And-decimal = large number)

Difference problem

Difference ÷ (multiple-1) = decimal

Decimal × multiple = large number

(or? Decimal+difference = large number)

Tree planting problem

1? The problem of planting trees on non-closed lines can be 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

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.

encounter a problem

Meeting distance = speed × meeting time

Meeting time = meeting distance/speed and

Speed sum = meeting distance ÷ meeting time

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

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

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.

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%)

Number of copies × number of copies = total? Total copies/copies = copies? Total copies/number of copies = number of copies

2, 1 multiple × multiple = multiple? What multiple1multiple = multiple? Multiply/Multiply = 1 Multiply

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

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

5. Work efficiency × working hours = total workload? Total amount of work ÷ work efficiency = working hours? Total workload ÷ working time = working efficiency

6. Appendix+Appendix = and? And-one addend = another addend

7. minuend-minuend = difference? Minus-Difference = Minus? Difference+Minus = Minus

8. Factor × factor = product? Product ÷ One factor = another factor

9. Divider Divider = quotient? Dividend quotient = divisor? Quotient × Divider = Divider

Calculation formula of mathematical graphics in primary schools

1, squared? (C: Wai? Student: Area? A: Side length)

Perimeter = side length ×4? C=4a

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

2. Cube? (5: volume? A: How long is the side? )

Surface area = side length× side length× 6? S table =a×a×6

Volume = side length x side length x side length? V=a×a×a

3. Rectangular (? C: circumference? Student: Area? A: How long is the side? )

Circumference = (length+width) ×2? C=2(a+b)

Area = length × width? S=ab

4. Cuboid? (5: volume? Student: Area? A: Long? b:？ Wide? H: high)

(1) surface area (length× width+length× height+width× height) ×2? S=2(ab+ah+bh)

(2) Volume = length × width × height? V=abh

5. Triangle? (s: area? A: Bottom? H: high)

Area = bottom × height ÷2? s=ah÷2

Height of triangle = area? × 2 bottom? Triangle base = area? × 2 Current height

6.parallelogram? (s: area? A: Bottom? H: high)

Area = bottom × height? S = ah

7. Trapezoidal? (s: area? At the bottom? B: Ass? H: high)

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

8. Round? (s: area? C: circumference? л? D= diameter? R= radius)

(1) circumference = diameter× л = 2×л× radius? C=лd=2лr

(2) area = radius × radius× л

9. Air cylinder? (5: volume? H: high? Student: The bottom area? R: bottom radius? C: perimeter of the bottom surface)

(1) transverse area = bottom circumference × height =ch(2лr or лd)? (2) Surface area = lateral area+bottom area ×2

(3) Volume = bottom area × height? (4) Volume = lateral area ÷2× radius.

10, cone? (5: volume? H: high? Student: The bottom area? R: bottom radius)

Volume = bottom area × height ÷3

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

12, the formula of sum and difference problem

(sum+difference) ÷ 2 = large number? (sum and difference) ÷ 2 = decimal

13 and the question of time

And ÷ (multiple-1) = decimal? Decimal × multiple = large number? (or? And-decimal = large number)

14, differential time problem

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

15, encountered a problem.

Meeting distance = speed × meeting time

Meeting time = meeting distance/speed and

Speed sum = meeting distance ÷ meeting time

16, 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.

17, profit and discount

Profit = selling price-cost

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

Up and down amount = principal × up and down percentage

Interest = principal × interest rate× time

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

Universal unit conversion

Length unit conversion

1 km = 1000 m？ 1 m = 10 decimeter? 1 decimeter = 10/0cm? 1 m = 100 cm？ 1 cm = 10/0mm

Area unit conversion

1 km2 = 100 hectare? 1 ha =10000m2? 1 m2 = 100 square decimeter

1 square decimeter = 100 square centimeter? 1 cm2 = 100 mm2

Volume (volume) unit conversion

1 m3 = 1000 cubic decimeter? 1 cubic decimeter = 1000 cubic centimeter? 1 cubic decimeter = 1 liter

1 cc = 1 ml？ 1 m3 = 1000 liter

Weight unit conversion

1 ton = 1000? Kilogram? 1 kg = 1000 g？ 1 kg = 1 kg

Rmb unit conversion

1 yuan = 10 angle? 1 angle = 10 minute? 1 yuan = 100 integral.

Time unit conversion

1 century = 100 year? 1 year = 65438+ February? Da Yue (3 1 day) has: 1? 8? Month? Abortion (30 days) is: 4? 9? moon

February 28th, normal year? February 29th of leap year? Normal year is 365 days. Leap year 366 days? 1 day =24 hours

1 hour =60 minutes? 1 min =60 seconds? 1 =3600 seconds