measurement

• length

  1m = 1000 mm

  = 100cm

  = 10dm

  1cm = 10mm

  1km = 1000m
• area

  1m2 = 10000cm2

  1 ha = 10000m2

  1km2 = 100ha
• mass

  1 kg = 1000 g

  1 t = 10 000 kg

  1 g = 1000mg
• volume

  1m3 = 1 000 000cm3

  = 1000dm3

  1L = 1000mL

  1 kL = 1000L

  1m3 = 1 kL

  1 cm3 = 1 mL

  1000 cm3 = 1L
• time

  1 min = 60s

  1h = 60 min

  1 day = 24h

  1 year = 365 days

  1 leap year = 366 days
• months of the year

  September, April, June and November = 30 days

  The rest has 31 days except for February.

  February has 28 days but in a leap year it has 29 days.
• seasons

  Summer = December, January and February

  Autumn = March, April and May

  Winter = June, July and August

  Spring = September, October and November
• perimeter is the length of its boundary

  area of a triangle is ½ *base*height

  area of a rectangle is length*breadth

  area of a square is side*side

  area of a parallelogram is length of base*distance between sides (height)

  area of a trapezium is height* average length of 2 parallel sides