, per share × number of shares = total number of shares/share = total number of shares/number of shares = 2 per share, 1 multiple × multiple = multiple ÷ 1 multiple = multiple ÷ multiple = 1 multiple 3, speed × time = distance ÷ work efficiency × working time = total work ÷ work efficiency = working time ÷ total work. Factor × factor = product divisor ÷ divisor = quotient dividend ÷ quotient = divisor quotient × divisor = calculation formula of primary school mathematics 1, square c perimeter s area a side length perimeter = side length ×4 C=4a area = side length× side length S=a×a 2, cube v: volume a:. 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 x 2 ÷ bottom triangle bottom = area x 2 ÷ height 6 parallelogram s area a bottom h height x h ∏ 28 circular 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. = Decimal Decimal × Multiply = Large number (or Decimal+Difference = Large number) Tree planting problem 1 Tree planting problem on the unclosed line can be mainly divided into the following three situations: (1) If trees are planted at both ends of the unclosed line, Then: number of plants = number of segments+1 = total length ÷ plant spacing-1 total length = plant spacing × (number of plants-1) plant spacing = total length ÷ (number of plants = number of nodes-1 = ÷ 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) ÷ Difference between two distributions = number of shares participating in distribution meets the requirements; 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 Solute weight+solvent weight = solution weight ÷ solution weight × 100% = concentrated solution weight × concentration = solute weight ÷ concentration = solution weight profit and discount profit. × 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 × (1-20/-)