1 cm = 10/0mm
Area unit conversion 1 square kilometer = 100 hectares 1 hectare = 10000 square meters 1 square meter = 100 square decimeter.
1 dm2 = 100 cm2 1 cm2 = 100 mm2
Unit of volume conversion 1 m3 = 1000 cubic decimeter 1 cubic decimeter = 1000 cubic centimeter.
1 cubic decimeter = 1 liter 1 cubic centimeter = 1 ml 1 cubic meter = 1000 liter.
Weight unit conversion 1 ton =1000kg1kg =1000mg1kg =1kg.
RMB unit conversion 1 yuan = 10 angle 1 angle = 10 minute 1 yuan = 100 minute.
Common graphic calculation formulas for primary school mathematics:
1, squared
Perimeter area side length
Perimeter = side length ×4
Area = side length × side length
C=4a
S=a×a S=a2
2. Cubes
Edge length of volume a
Surface area = side length × side length× 6 volume = side length× side length× side length.
S table =a×a×6 table =6a2
V=a×a×a V= a3
3. Rectangular
Perimeter area side length
Circumference = (length+width) ×2
C=2(a+b)
Area = length × width
S=ab
4. Cuboid
Volume area length width height
(1) surface area = (length× width+length× height+width× height) ×2
(2) Volume = length × width × height
S=2(ab+ah+bh)
V=abh
5. Triangle
S area a bottom h height
Area = bottom × height ÷2
S=ah÷2
Height of triangle = area ×2÷ base.
Triangle base = area ×2÷ height
6. Parallelogram
S area a bottom h height
Area = bottom × height
S = ah
7. Trapezoidal
S area a upper bottom b lower bottom
H height
Area = (upper bottom+lower bottom) × height ÷2
S=(a+b)× h÷2
8, round
S area, c circumference, π π
Diameter r radius
Circumference = diameter × π
Circumference =2×π× radius
Area = radius × radius× π
C=πd
C=2πr
S=πr2
d = C \uπ
d=2r
r = d÷2 r = c÷2π
S ring =π(R2-r2)
9. Cylinder
Volume height bottom area bottom radius bottom perimeter
Transverse area = bottom circumference × height.
(2) Surface area = lateral area+bottom area ×2
(3) Volume = bottom area × height
S side =Ch
S side =πdh
V=Sh
V=πr2h
Cylinder volume = side area ÷2× radius.
10, conical
Volume height
Bottom area r bottom radius
Volume = bottom area × height ÷3
V=Sh÷3
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