65438+ 0× number of shares per share = total number of shares = total number of shares = number of shares = number of shares.

2 1 multiple× multiple = multiple1multiple = multiple/multiple = 1 multiple

3 speed × time = distance distance ÷ speed = time distance ÷ time = speed

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

5 working efficiency × working time = total work amount ÷ working efficiency = working time ÷ total work amount ÷ working time = working efficiency

6 addend+addend = and-one addend = another addend.

7 minuend-minuend = difference minuend-difference = minuend difference+minuend = minuend

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

9 Dividend Divider = quotient divisor = divisor quotient × divisor = dividend

Second, the calculation formula of primary school mathematics graphics

1 square c perimeter s area a side length perimeter = side length× 4c = 4a area = side length× side length s = a× a.

2 cubic v: volume a: surface area of side length = 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 a side length perimeter = (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 (length× width+length× height+width× height )× 2s = 2 (AB+AH+BH) (2) volume = length× width× height V=abh.

5 triangle s area a base h height area = base x height ÷2 s=ah÷2 triangle height = area x 2 ÷ base triangle base = area x 2 ÷ height.

6 parallelogram s area a bottom h height area = bottom x height s=ah

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

8 circle s area c perimeter ∏ d= diameter r= radius (1) perimeter = diameter x ∏ = 2 x ∏× radius c = ∏ d = 2 x r (2) area = radius x radius x ∏.

9 cylinder v: volume h: height s; Bottom area r: bottom radius c: bottom circumference (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.

Three: the problem of sum-difference formula

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

Four: and the issue of the times

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

Five: the problems of different times

Difference ÷ (multiple-1) = decimal × multiple = large number (or decimal+difference = large number) elementary school olympiad formula

Six: the problem of sum and difference formula

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

Seven: the problem of sum-multiple formula

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

Eight: the formula of differential multiple problem

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

Nine: the formula for planting trees

1 The problem of planting trees on unclosed lines can be divided into the following three situations:

(1) If trees are to be planted at both ends of the non-closed line, then: number of plants = number of segments+1 = total length-1 = total length × (number of plants-1) = total length-(number of plants-1) (2) Then: number of plants = number of nodes = total length ÷ plant spacing = plant spacing × 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 ÷ plant spacing-1 = plant spacing ×

The quantitative relationship of planting trees on the closed line is as follows: number of trees = number of segments = total length/plant spacing = plant spacing × number of trees = total length/plant spacing.

X: profit and loss problem's formula

(profit+loss) ÷ Difference of two distributions = number of shares participating in distribution (big profit-small profit) ÷ Difference of two distributions = number of shares participating in distribution (big loss-small loss) ÷ Difference of two distributions = number of shares participating in distribution.

XI: formula for encountering problems

Meet distance = speed and x meet time = meet distance/sum of speed and speed = meet distance/meet time.

XII: The formula for tracing the problem.

Catch-up distance = speed difference × catch-up time = catch-up distance ÷ speed difference speed difference = catch-up distance ÷ catch-up time

Thirteen: the problem of running water

Downstream speed = still water speed+countercurrent speed = still water speed-water flow speed = (downstream speed+countercurrent speed) ÷2 Water flow speed = (downstream speed-countercurrent speed) ÷2

XIV: Formula of concentration problem

Solute weight+solvent weight = solution weight × 100% = concentrated solution weight× concentration = solute weight/concentration = solution weight.

XV: Profit formula and discount problem

Profit = selling price-cost profit rate = profit/cost×100% = (selling price/cost-1) × 100% fluctuation amount = principal× fluctuation percentage discount = actual selling price×100.

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