Length unit:

1km = 1000m 1m = 10DM 1DM = 10cm 1cm = 10mm

1 m = 100 cm

Area unit:

1 km2 = 1 00ha =100000m21hectare =10000m2.

1 m2 = 100 square decimeter 1 square decimeter = 100 square centimeter

Volume (volume) unit:

1 m3 = 1000 cubic decimeter

1 l = 1 cubic decimeter 1 ml = 1 cubic centimeter 1 l = 1000 ml.

Mass unit:

1 ton = 1 000kg1kg =1000g

Time unit:

1 century = 100 1 year = 1 February 1 year =365 days (normal year)1year =366 days (leap year)

65438+ October =28 days (February of normal year) 65438+ October =29 days (February of leap year)

1 month =30 days (April, Saturday, September and November)

65438+ 10 month =3 1 day (January, Wednesday, Friday, July, August, October and December)

1 week = 7 days 1 day =24 hours 1 hour =60 minutes 1 minute =60 seconds 1 hour =3600 seconds.