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 Work efficiency × working hours = total workload.
Total work/working efficiency = total working time/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 one factor = product ÷ another factor
9 Dividend Divider = quotient divisor = divisor quotient × divisor = dividend
Calculation formula of mathematical graphics in primary schools
1 square c perimeter s area a side length
Perimeter = side length ×4 C=4a Area = side length× side length s = a× a.
2 cubic V: volume A: side length surface area = side length × side length× ×6 S Table =a×a×6
Volume = side length × side length × side length v = a× a× a.
3 rectangle
Perimeter area side length
Circumference = (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 bottom h height
Area = base × height ÷2 s=ah÷2 triangle height = area× 2 triangle base = area× 2 triangle height.
6 parallelogram
S area a bottom h height
Area = bottom × height s=ah
7 trapezoid
Height of upper bottom b and lower bottom h in s area a
Area = (upper bottom+lower bottom) × height ÷2 s=(a+b)× h÷2.
8 laps
Area c perimeter d= diameter r= radius
(1) perimeter = diameter ×∏=2×∏× radius C=∏d=2∏r
(2) area = radius × radius×∈
Cylinder 9
V: volume h: height s; Bottom area r: bottom radius c: bottom perimeter
(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
Formula of sum and difference problem
(sum+difference) ÷ 2 = large number (sum-difference) ÷ 2 = decimal.
And folding problems.
Sum ÷ (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)
Tree planting problem
1 The problem of planting trees on unclosed lines can be 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 you want to plant trees at one end of the unclosed line and not at the other end, then:
Number of plants = number of segments = total length/plant spacing = plant spacing × plant number = total length/plant number
(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 total length = plant spacing × (number of plants+1) plant spacing = total length ÷ (number of plants+1)
The quantitative relationship of planting trees on the closed line is as follows
Number of plants = number of segments = total length/plant spacing = plant spacing × plant number = total length/plant number
The question of profit and loss
(Profit+Loss) ÷ 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) ÷ The difference between two distributions = the number of shares participating in the distribution.
encounter a problem
Meeting distance = speed and x 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 distance/speed difference
Speed difference = catching distance ÷ catching time
Tap water problem
Downstream velocity = still water velocity+flow velocity = still water velocity-flow velocity
Still water speed = (downstream speed+countercurrent speed) ÷2 Water flow speed = (downstream speed-countercurrent speed) ÷2
Concentration problem
Solute weight+solvent weight = solution weight.
The weight of solute/solution × 100% = concentration.
Solution weight × concentration = solute weight/solute concentration = solution weight.
Profit and discount problem
Profit = selling price-cost
Profit rate = profit/cost × 100% = (selling price/cost-1) × 100%.
Up and down amount = principal × up and down 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%)