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. = 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 ÷ (then: number of plants = number of nodes-1 = ÷ the difference between the two distributions = the number of shares participating in the distribution meets the problem; Meeting distance = speed, x meeting time = meeting distance; The sum of speed and speed = meeting distance; Meeting time; Problem catching distance = speed difference × catching time = catching distance; Speed difference = catching distance; In-time profit and discount problem profit = selling price ÷ cost-1) × 100% fluctuation amount = principal× fluctuation percentage discount = actual selling price ÷ original selling price× 1 00% (discount <1) interest = principal× interest rate. Length unit conversion 1 km = 1 000m1m =1decimeter1decimeter =10cm/cmha =10000.