1 m = 10 decimeter =100 cm =1000 mm.
1 decimeter =10cm =100mm
1 cm = 10/0mm
One kilometer = 1000 meter
Tertiary weight unit:
Grams, kilograms, tons,
1 kg =1000g
1 ton = 1000 kg
The third grade area unit:
Square meters, square decimeters, square centimeters,
1 m2 = 100 m2
1 square decimeter = 100 square centimeter
Third grade time unit formula:
1 year = 12 months
Da Yue: 3 1 day
Abortion: 30 days
February: 28 or 29 days
Average year: 365 days: 52 weeks 1 day.
Leap year: 366 days: 52 weeks and 2 days.
1 week =7 days
1 day =24 hours
1 hour =60 minutes
1 min =60 seconds