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Elementary school 1-6 grade mathematical formula daquan
I. Unit conversion
1, unit of length
1 km = 1 000m1m = 10 decimeter.
1 decimeter = 1 0cm1cm =10mm
2. Area unit
1 m2 = 100 square decimeter month
1 square decimeter = 100 square centimeter
1 cm2 = 100 mm2
1 ha = 1 10,000 m2
1 km2 = 100 hectare
3. unit of volume
1 m3 = 1000 cubic decimeter
1 cubic decimeter = 1000 cubic centimeter
1 cm3 = 1000 cm3
4. unit of volume
1 liter = 1 cubic decimeter = 1000 ml 1 ml = 1 cubic centimeter.
5. Weight unit
1 ton = 1 000kg1kg =1000g
6. RMB unit
1 yuan = 10 angle? 1 angle = 10 point 1 yuan = 100 point.
7. Time unit: 1 century = 100 year.
1 year = 65438+ February.
The big month (3 1 day) includes: 1, 3, 5, 7, 8,10,65438+February.
Abortion (30 days) includes: April, June, September,165438+1October.
There are 365 days in a normal year and 366 days in a boudoir year.
Normal year: February 28th.
February 29th of leap year.
1 =3600 seconds
1 day =24 hours
1 min =60 seconds
1 =60 points
Second, the geometric formula
1. Perimeter of the square = side length x4
Formula: C=4a
Area of a square = side length × side length
Formula: S=axa
1 ml = 1 cm3 1 yuan = 100 integral.
Formula: S=axa
Volume of cube = side length × side length × side length
Formula: V=axaxa
2.？ Perimeter of rectangle = (length+width) x2
Formula: C=(a+b)x2
Area of rectangle = length x width
Formula: S=axb
Cuboid volume = length × width × height
Formula: V=axbxh
3. Area of triangle = base x height ÷2
Formula: S=axh÷2
4.？ Area of parallelogram = base x height
Formula: S=axh
5.？ Trapezoidal area = (upper bottom+lower bottom) x height ÷2
Formula: S=(a+b)h÷2
6. Diameter of circle = radius x2
Radius = diameter +2
Formula: d=2r
Formula: r=d÷2
Circumference = pi x diameter
Formula: C=Tmd=2mr
Area of circle = radius x radius x? T
Formula: S=mr2
7. The side area of the cylinder = the perimeter of the bottom surface x the height.
Formula: V=Sh
8, factor x factor = product
Product: one factor = another factor
9. Dividend: Dividend = quotient
Dividend: quotient = divisor quotient x divisor = dividend
10 formula, sum and difference problem
(sum+difference) +2= large number
(Sum and Difference) -2= Decimal
1 1, and the problem of times
And-(multiple-1)= decimal.
Decimal x multiple = large number (or sum-decimal = large number)
12, differential time problem
Difference: (multiple-1)= decimal.
Decimal x multiple = large number (or small+difference = large number)
13, planting trees:
The problem of planting trees on non-closed lines can be divided into the following three situations:
(1) If it is at both ends of the unclosed line,
To plant trees and then:
Plant number = number of segments+1= total length+plant spacing-1
Total length = plant spacing x (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
Total length = plant spacing x number of plants?
Plant spacing = total length/number of plants
(3) If no trees are planted at both ends of the unclosed line, the number of plants = number of segments-1= total length+plant spacing-1.
Total length = plant spacing x (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 x number of plants
Plant spacing = total length+number of plants
14, profit and loss problem
(Profit+Loss) The difference between two distributions = the number of shares participating in the distribution.
(Big profit-small profit) Difference between two distributions = number of shares participating in distribution.
(big loss-small loss) The difference between the two distributions = the number of shares participating in the distribution.
15, encountered a problem.
Meeting distance = speed x meeting time.
Meeting time = meeting distance+speed sum
Speed Sum = Meeting Distance+Meeting Time
16, catch up with the problem
Chasing distance = speed difference x catching time
Catch-up Time = Catch-up Distance+Speed Difference
Speed difference = catching distance+catching time
17, running 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
18, concentration problem:
Solute weight+solvent weight = solution weight.
Solute weight+solution weight x 100%= concentration.