Length: 1 meter (m) = 100 cm (cm), 1 cm (cm) = 10 mm (mm)
Area: 1 m2 (m? ) = 10000 square centimeters (cm? )， 1 cm2 (cm？ )=0.000 1 m2 (m？ )
Volume: 1 m3 (m? ) = 1000 cubic decimeter (dm? ), 1 cubic decimeter (dm? ) =0.00 1 m3 (m? )
Mass: 1 kg = 1000 g (g), 1 g (g)=0.00 1 kg (kg).
Time: 1 hour (h)=60 minutes (min), 1 minute (min)=60 seconds (s).
1, length unit conversion
1 km = 1 000m1m = 10 decimeter.
1 decimeter =10cm1m =10cm.
1 cm = 10/0mm
2, area unit conversion
1 km2 = 100 hectare
1 ha = 1 10,000 m2
1 m2 = 100 square decimeter
1 square decimeter = 100 square centimeter
1 cm2 = 100 mm2
Volume (volume) unit conversion
1 m3 = 1000 cubic decimeter
1 cubic decimeter = 1000 cubic centimeter
1 cubic decimeter = 1 liter
1 cm3 = 1 ml
1 m3 = 1000 liter
3, weight unit conversion
1 ton = 1000 kg
1 kg =1000g
1 kg = 1 kg
4. RMB unit conversion
1 yuan = 10 angle.
1 angle = 10 point
1 yuan = 100 integral.
5. Time unit conversion
1 century = 100 1 year =65438+ February.
The big month (3 1 day) is: 13578 1065438+ February.
Abortion (30 days) includes: 469 1 1 month.
February 28th in a normal year and February 29th in a leap year.
There are 365 days in a normal year and 366 days in a leap year.
1 day =24 hours 1 hour =60 minutes.
1 minute =60 seconds 1 hour =3600 seconds.
1 century = 100 year; * 1 year = average number of years of 365 days; * One year =366 days leap year
January, Wednesday, Friday, July, August, October and December are big months, with 3 1 day.
Four, six, nine and eleven are abortions. Abortion lasts for 30 days.
There are 28 days in February in a normal year and 29 days in February in a leap year.
1 day = 24 hours * 1 hour =60 minutes * 1 minute =60 seconds.
6, geometric shape perimeter area volume calculation formula
1, the perimeter of the rectangle = (length+width) ×2C=(a+b)×2.
2. The circumference of a square = side length ×4C=4a.
3. Area of rectangle = length× width S=ab
4. Square area = side length x side length s = a.a = a.
5. Area of triangle = base × height ÷2S=ah÷2.
6. parallelogram area = bottom x height S=ah
7. trapezoidal area = (upper bottom+lower bottom) × height ÷ 2s = (a+b) h ÷ 2.
8. Diameter = Radius× 2D = 2r Radius = Diameter ÷2r=d÷2
9. The circumference of a circle = π× diameter = π× radius× 2c = π d = 2π r.
10, area of circle = π× radius× radius.
7, primary school mathematics commonly used formula daquan (quantitative relationship calculation formula)
1, unit price × quantity = total price 2, single output × quantity = total output.
3, speed x time = distance 4, efficiency x time = total work.
5. Appendix+Appendix = and one addend = and+another addend
Minus-Minus = Difference Minus = Difference Minus
Negative = negative+difference
Factor × factor = product One factor = product ÷ another factor.
Divider = quotient divisor = dividend = quotient
Dividend = quotient × divisor
Division with remainder: dividend = quotient × divisor+remainder
A number is divided by two consecutive numbers. You can multiply the last two numbers first, and then divide this number by their product, and the result is still the same. For example: 90 ÷ 5 ÷ 6 = 90 ÷ (5× 6)
6. 1 km = 1 km 1 km =1000m
1 m = 10 decimeter 1 decimeter =10 cm1cm =10 mm.
1 m2 = 100 square decimeter 1 square decimeter = 100 square centimeter
1 cm2 = 100 mm2
1 m3 = 1000 cubic decimeter
1 cm3 = 1000 cm3
1 ton = 1 000kg1kg = 1 000g = 1 kg =1kg.
1 hectare = 1 10,000 square meters. 1 mu = 666.666 square meters.
1 liter = 1 cubic decimeter = 1000 ml 1 ml = 1 cubic centimeter.