A complete collection of mathematical calculation formulas in primary schools

All formulas of primary school mathematics

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

Total copies/number of copies = number of copies

2. 1 multiple × multiple = multiple ÷ 1 multiple = multiple

Multiply/Multiply = 1 Multiply

3. Speed × time = distance/speed = time

Distance/time = speed

4. Unit price × quantity = total price/unit price = quantity

Total price ÷ quantity = unit price

5. Work efficiency × working time = 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. Minus-Minus = Difference Minus-Difference = Minus

Difference+Minus = Minus

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

9. Dividend = quotient dividend = quotient = divisor

Quotient × Divider = Divider

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 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 perimeter, s area, and a 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 (L× W+L× H+W+H) ×2 S=2(ab+ah+bh).

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

5, triangle S area A base 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 base and h height

Area = bottom × height s=ah

7. Trapezoid: s area a, upper bottom b, and lower bottom h high.

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

8. circle: s plane, c circumference ∏ 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: perimeter of bottom surface

(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

Formula of sum and difference problem

(sum+difference) ÷ 2 = large number (sum-difference) ÷ 2 = decimal.

And folding problems.

Sum ÷ (multiple- 1) = decimal × multiple = large number

(or sum-decimal = large number)

Difference problem

Difference ÷ (multiple-1) = decimal× multiple = large number

(or decimal+difference = large number)

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 = 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%)

Length unit conversion

1 km =1000m1m =10 decimeter1decimeter = 10cm.

1m = 100cm 1cm = 10mm

Area unit conversion

1 km2 = 1 00ha1hectare =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 = 1 liter 1 cubic centimeter = 1 ml.

1 m3 = 1000 liter

Weight unit conversion

1t = 1000kg 1kg = 1000g 1kg = 1kg。

Rmb unit conversion

1 yuan = 10 angle 1 angle = 10 point 1 yuan = 100 point.

Time unit conversion

1 century = 100 1 year =65438+ February.

The big month (3 1 day) includes:1\ 3 \ 5 \ 7 \ 8 \10 \ 65438+February.

Abortion (30 days) includes: April \ June \ September \165438+1October.

February 28th in a normal year and February 29th in a leap year.

There are 365 days in a normal year and 366 days in a leap year.

1 day =24 hours 1 hour =60 minutes

1 min = 60s 1 hr = 3600s.

Calculation formula of perimeter, area and volume of mathematical geometry in primary schools

1, the perimeter of the rectangle = (length+width× 2c = (a+b )× 2.

2. The circumference of a square = side length ×4 C=4a.

3. Area of rectangle = length× width S=ab

4. Square area = side length x side length s = a.a = a.

5. Area of triangle = base × height ÷2 S=ah÷2.

6. parallelogram area = bottom x height S=ah

7. Trapezoidal area = (upper bottom+lower bottom) × height ÷2

S=(a+b)h÷2

8. Diameter = radius× 2d = 2r

Radius = diameter ÷2 r= d÷2

9. The circumference of a circle = π× diameter = π× radius× 2.

c=πd =2πr

10, area of circle = π× radius× radius.

The number of changes

Map distance/actual distance = scale

Distance on the map = scale × actual distance

Actual distance = distance on map/scale.

Proportional relation x/y=k (certain)

Inverse relationship x.y=k (definite)