1, x number of shares per share = total number of shares/number of shares = 2, 1 multiple x multiple = multiple1multiple = multiple/multiple = 1 multiple 3, speed x unit price x quantity = total price. Work efficiency × working hours = total workload ÷ work efficiency = working hours ÷ total addend+addend = sum-one addend = another addend 7, minuend-subtrahend = factor× factor = product ÷ one factor = another factor 9, dividend ÷ divisor = quotient dividend ÷. The calculation formula of primary school mathematics figure 1, square c perimeter s area a side length perimeter = side length ×4 C=4a area = side length× side length. Cube v: volume a: side surface area = side length × side length× ×6 S table =a×a×6 volume = side length× side length V=a×a×a 3, Rectangular c perimeter s area A side length perimeter = (length+width) × 2 c = 2 (a+b) area = length × width S. 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 x height ÷2 s=ah÷2 triangle height = area × 2 ÷ bottom triangle bottom = area × 2 ÷ height 6 parallelogram s area a bottom h height × h ∏ 2 8 circle s area c circumference ∏. Bottom area r: bottom radius c: bottom perimeter (1) lateral area = bottom perimeter x height (2) surface area = lateral area+bottom area x 2 (3) volume = bottom area x height (4) volume = lateral area ÷ 2 x radius 10 cone v: volume h: height. Base area r: base radius volume = base area × height ÷3 Total number ÷ Total number = formula (sum+difference) ÷ 2 = large number (sum-difference) ÷ 2 = sum of decimal and multiple problems ÷ (multiple-1) = decimal × multiple. Tree planting problem 1 tree planting problem on unclosed line can be divided into the following three situations: (1) If trees are to be planted at both ends of unclosed line, then: number of plants = number of segments+1 = total length ÷ plant spacing-1 = total length = plant spacing × (number of plants- Then: number of plants = number of nodes = total length ÷ plant spacing = plant spacing × number of plants = total length ÷ number of plants (3) If trees are not planted at both ends of the non-closed line, then: number of plants = number of nodes-1 = total length ÷ plant spacing-1 total length = plant spacing. Meeting distance = speed × meeting time = meeting distance; The sum of speed and speed = meeting distance; Meeting time; Catch up with the problem; Distance = catch up with time; Distance; Speed difference = catching distance; Catch up with time; Downstream speed = downstream speed+countercurrent speed) ÷2 Water flow speed = (downstream speed-countercurrent speed) ÷2 Concentration problem Solute weight+solvent weight = solution weight ÷ solution weight × 100% = concentration solution weight × concentration = solute weight ÷ concentration = solution weight and discount problem profit = selling price. × 100% increase or decrease = principal× increase or decrease 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-) M = 15438 product unit conversion 1 m3 = 1000 cubic decimeter 1 cubic decimeter = 1000 cubic centimeter 1 cubic decimeter = 1 liter/kloc-. Kg 1 kg = 1000g 1 kg RMB unit conversion 1 yuan = 10 angle1angle =10 minute1yuan =/kloc. Yes:1\ 3 \ 5 \ 7 \ 8 \10 \ 65438+abortion in February (30 days): 4 \ 6 \ 9 \ 65438. Leap year 366 days 1 day =24 hours 1 hour =60 minutes 1 minute =60 seconds 1 hour =3600 seconds. The formula for calculating the perimeter, area and volume of primary school mathematics and geometry is 1, and the perimeter of rectangle = (length Area of rectangle = length× width S=ab 4, area of square = side length× side length S=a.a= a 5, area of triangle = bottom× height ÷2 S=ah÷2 6, area of parallelogram = bottom× height S=ah 7, area of trapezoid = (upper bottom+lower bottom) ×