Total copies/number of copies = number of copies
Total copies/number of copies = number of copies
1 multiple × multiple = multiple
Multiply1Multiply = Multiply
Multiply/Multiply = 1 Multiply
Speed × time = distance
Distance/speed = time
Distance/time = speed
Unit price × quantity = total price
Total price/unit price = quantity
Total price ÷ quantity = unit price
Work efficiency × working hours = total workload.
Total amount of work ÷ work efficiency = working hours
Total workload ÷ working time = working efficiency
addend
+Addendum = Sum
And-one addend = another addend
minuend
-Subtraction = Difference
Negative difference = negative
Difference+Minus = Minus
Factor × factor = product
Product ÷ One factor = another factor
bonus
Divider = quotient
Dividend = divisor
Quotient × Divider = Divider
Primary school mathematics
Graphic calculation formula
square
C circumference
S region
length of a side
Perimeter = side length ×4
c=4a
Area = side length × side length
s=a×a
cube
Five volumes
a
edge
Surface area = side length × side length ×6
S table =a×a×6
Volume = side length × side length × side length
v=a×a×a
three
rectangle
C perimeter s area
length of a side
Circumference = (length+width) ×2
c=2(a+b)
Area = length × width
s=ab
four
Cubic
Five volumes
Area a length b
extensive
H height
(1) Surface area (L× W+L× H+W× H) ×2
s=2(ab+ah+bh)
(2) Volume = length × width × height
v=abh
five
triangle
S region
Adidas
H height
Area = bottom × height ÷2
s=ah÷2
High triangle
= area
× 2 base
Triangle base = area
× 2 Current height
parallelogram
S region
Adidas
H height
Area = bottom × height
S = ah
trapeziform
S region
A shangdi
Shadi
H height
Area = (upper bottom+lower bottom) × height ÷2
s =(a+b)× 1
h \u 2
eight
Round; circular
S region
C circumference
∏
D= diameter
R= radius
(1) circumference = diameter × ∏ = 2× ∏? radius
c =∏d = 2r
(2) area = radius × radius×∈
nine
cylinder
Volume height
s；
Jianping
R bottom radius
Bottom circumference
( 1)
border area/region
= bottom circumference × height
(2) Surface area = lateral area+bottom area ×2
(3) Volume = bottom area × height
(4) Volume = lateral area ÷2× radius.
cone
Five volumes
H height
s； Jianping
R bottom radius
Volume = bottom area × height ÷3
Total number ÷ Total number of copies = average value
Sum-difference problem
Formula of
(sum+difference) ÷ 2 = large number
(sum and difference) ÷ 2 = decimal
And folding problems.
Sum \ (multiple-1) = decimal
Decimal × multiple = large number
(or
And-decimal = large number)
Difference problem
Difference ÷ (multiple-1) = decimal
Decimal × multiple = large number
(or
Decimal+difference = large number)
Tree planting problem
The problem of planting trees on non-closed lines can be mainly divided into the following three situations.
(1) If trees are planted at both ends of the non-closed line, then
Number of plants =
count
+1 = total length-1.
Total length = plant spacing × (number of plants-1)
Plant spacing = total length ÷ (number of plants-1)
If you want to plant trees at one end of the non-closed line and not at the other end, then
Number of plants = number of segments = total length ÷ plant spacing
Total length = plant spacing × number of plants
Plant spacing = 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-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
Total length = plant spacing × number of plants
Plant spacing = total length/number of plants
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 × meeting time
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 time = catch-up distance ÷ speed difference
Speed difference = catching distance ÷ catching time
Tap water problem
Downstream velocity = still water velocity+current velocity
Countercurrent velocity = still water velocity-current velocity
Still water velocity = (downstream velocity+countercurrent velocity) ÷2
Water velocity = (downstream velocity-countercurrent velocity) ÷2
Concentration problem
Solute weight+solvent weight = solution weight.
The weight of solute/solution × 100% = concentration.
Solution weight × concentration = solute weight
Solute weight-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%)