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All Mathematical Formulas in Primary Schools (Hubei Education Edition)
Sujiaoban primary school mathematics formula daquan

1

Number of copies × number of copies = total number of copies

Total copies/number of copies = number of copies

Total copies/number of copies = number of copies

2

Cardinal x multiple = multiple

Multiply ÷ radix = multiple

Multiply ÷ Multiply = radix

three

Speed × time = distance

Distance/speed = time

Distance/time = speed

four

Unit price × quantity = total price

Total price/unit price = quantity

Total price ÷ quantity = unit price

five

Work efficiency × working hours = total workload.

Total amount of work ÷ work efficiency = working hours

Total workload ÷ working time = working efficiency

six

Appendix+Appendix = Sum

And-one addend = another addend

seven

Negative-negative = difference

Negative difference = negative

Difference+Minus = Minus

eight

Factor × factor = product

Product ÷ One factor = another factor

nine

Dividend = quotient

Dividend = divisor

Quotient × Divider = Divider

Calculation formula of mathematical graphics in primary schools

1

square

C

bellyband

S

zone

a

Length of side

Perimeter = side length ×

four

C=4a

zone

=

Side length × side length

S=a×

a=a

2

2

cube

Five:

roll

A:

edge

superficial area

=

Side length × side length ×

six

S

table

=a

×

a

×

6=6a

2

roll

=

Side length × side length× side length

V=a×

A x

a=a

three

three

rectangle

C

bellyband

S

zone

a

Length of side

bellyband

=(

long

+

extensive

)

×

2

C=2(a+b)

zone

=

Length × width

S=ab

four

Cubic

Five:

roll

Student:

zone

A:

long

B:

extensive

h:

high

( 1)

superficial area

(

Length × width

+

Length × height

+

Width × height

)

×

2

S=2(ab+ah+bh)

(2)

roll

=

Length× width× height

V=abh

five

triangle

s

zone

a

bottom

h

high

zone

=

Bottom× height' ao

2

s=ah

2

High triangle

=

zone

×

2

Jiandi

Triangular base

=

zone

×

2

high

six

parallelogram

s

zone

a

bottom

h

high

zone

=

Base × height

S = ah

seven

trapeziform

s

zone

a

Upper base

b

Shadi

h

high

zone

=(

Upper base

+

Shadi

)

Xigao' ao

2

s =(a+b)× 1

2

eight

Round; circular

S

zone

C

bellyband

d=

diameter

r=

radius

( 1)

bellyband

=

Diameter ×

=2

×

× radius

C=

d=2

r

(2)

zone

=

Radius × radius ×

=

r

2

nine

cylinder

Five:

roll

h:

high

s;

Jianping

r:

Bottom radius

C:

Bottom circumference

( 1)

border area/region

=

Bottom circumference × height

(2)

superficial area

=

border area/region

+

Bottom area ×

2

(3)

roll

=

Bottom area × height

(4)

Volume = lateral area.

2

× radius

10

cone

Five:

roll

h:

high

s;

Jianping

r:

Bottom radius

roll

=

Bottom area × height

three

Total number ÷ Total number of copies = average value

Sum-difference problem

(

Knowing the sum and difference of two numbers, the application problem of finding out what the two numbers are respectively.

)

Formula of

(

Sum+difference

)

÷

2

= large number

(

And poor

)

÷

2

= Decimal

Multiple summation problem (

Know the relationship between the sum of two numbers and multiples of two numbers, and find two numbers.

)

Heao

(

multiple

+ 1)

= Decimal

Decimal × multiple = large number

(

or

Sum-Decimal = large number

)

Difference problem

(Know the difference between two numbers and the multiple relation of two numbers, and find two numbers)

Chaao

(

Multiple-

1)

= Decimal

Decimal × multiple = large number

(

or

Decimal+difference = large number

)

Tree planting problem

1

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 open line.

,

therefore

Number of plants = number of fragments+

1

= total length ÷ plant spacing-

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 unclosed line.

,

Don't plant trees at the other end.

,

therefore

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.

,

therefore

Number of plants = number of fragments-

1

= total length ÷ plant spacing-

1

Total length = plant spacing ×

(

Number of plants+

1)

Plant spacing = total length.

(

Number of plants+

1)

2

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.

(

Daying-Xiaoying

)

Difference between two distributions = number of shares participating in distribution.

(

Big loss-small loss

)

Difference between two distributions = number of shares participating in 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

Hydrostatic velocity =

(

Downstream velocity+countercurrent velocity

)

÷

2

Current speed =

(

Downstream velocity-countercurrent velocity

)

÷

2

Concentration problem

Solute weight+solvent weight = solution weight.

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%

=

(

Sales price/cost-

1)

×

100%

Up and down amount = principal × up and down percentage

Discount = actual selling price ÷ original selling price ×

100%(

discount

1)

Interest = principal × interest rate× time

After-tax interest = principal × interest rate× time

( 1

-Tax rate

)