Current location - Training Enrollment Network - Mathematics courses - All formulas of primary school mathematics
All formulas of primary school mathematics
1, number of copies × number of copies = total? Total copies/number of copies = number of copies

Total copies/copies = copies?

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

What multiple/multiple = 1 multiple?

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 amount of work ÷ working time = working efficiency?

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

7. Minus-Minus = Difference Minus-Difference = Minus?

Difference+subtraction = subtraction?

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

3. rectangle: c perimeter, s area, and a side length.

Circumference = (length+width) ×2C=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) ×2? S=2(ab+ah+bh)?

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

5. What is the height of the area A and the base H of the triangle?

Area = bottom × height ÷2s=ah÷2?

Height of triangle = area × 2 bottom?

Triangle base = area ×2÷ height?

6. parallelogram: s area, a base and h height

Area = bottom × height? S = huh?

7. trapezoid: s area a, upper bottom b, lower bottom h?

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 ×∏ = 2×∏× radius? C=∏d=2∏r?

(2) area = radius × radius× ∏?

9. cylinder: v: volume h: height s: bottom area r: bottom radius

C: bottom circumference?

(1) Side area = bottom perimeter × 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?

Formula of sum and difference problem?

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

And times the problem?

And ÷ (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)?

Planting trees?

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 trees are planted at one end of the non-closed line, but not at the other end, then:

Number of plants = number of nodes = 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 nodes = total length ÷ plant spacing?

Total length = plant spacing × number of plants? Plant spacing = total length ÷ number of plants?

Profit and loss problem?

(profit+loss) ÷ Difference between two distributions = number of shares participating in distribution?

(Daying-Xiaoying) ÷ The difference between the two distributions = the number of shares participating in the distribution?

(big loss-small loss) ÷ Difference between two distributions = number of shares participating in distribution?

Have a problem?

Meeting distance = speed and × 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?

Running water problem?

Downstream velocity = still velocity+current velocity?

Countercurrent velocity = still water velocity-current velocity?

Static water velocity = (downstream velocity+countercurrent velocity) ÷2?

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

Focus on the problem?

Solute weight+solvent weight = solution weight?

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

Solution weight × concentration = solute weight?

Weight-concentration of solute = weight of solution?

Profit and discount?

Profit = selling price-cost?

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

Increase or decrease amount = principal × increase or decrease percentage?

Discount = actual selling price ÷ original selling price × 100% (discount < 1)?

Interest = principal x interest rate x time?

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

Length unit conversion?

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

1 m = 100 cm? 1 cm = 10 mm?

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 cubic centimeter = 1 ml?

1 m3 = 1000 liter?

Weight unit conversion?

1 ton = 1000 kg? 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\ 3 \ 5 \ 7 \ 8 \10 \ 65438+February?

Abortion (30 days) has:? April \ June \ September \ 165438+ October?

February 28th, normal year? February 29th of leap year?

365 days in a normal year and 366 days in a leap year?

1 day =24 hours 1 hour =60 minutes

1 minute =60 seconds 1 hour =3600 seconds?

What is the formula for calculating the perimeter, area and volume of mathematical geometry in primary schools?

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

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

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

4. Area of a square = side length × side length S=a.a= a?

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

6. Area of parallelogram = base × height S=ah?

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

S=(a+b)h÷2?

8. Diameter = radius ×2? d=2r?

Radius = diameter ÷2r= d÷2?

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

c=πd =2πr?

10, circular area = pi × 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)