Åk 6–9
 
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2.3 Standard Units for Measuring Area
For people to be able to understand each other when comparing areas of difference places and surfaces, demands that there is a unit used to measure area.  Here are the area measurements that we use in different situations.

1 square meter 1 m²
1 square meter is the measurement of a square where each side is 1 m.

Use: For example when you describe the size of a house.
Square meter are the basic unit for area.

How many square meters do you think your bed is?
How many people do you think can fit into a square meter?
How big is the room you’re sitting in?



1 square kilometer 1 km²
1 square kilometer is the measurement of area for a square where each side is 1 km.

Use: To describe the side of a country.



1 hectare 1 ha
1 hectare is a square where each side is 100 m.
Written as: 1 ha = 100 m x 100 m = 10,000 m²

Use: When expressing the size of fields or wooded land.

How many hectares is your school yard?



1 ar
1 ar a measurement of area of a square where each side is 10 m.
Written: 1 ar = 10 m x 10 m = 100 m².

Use: Not so often.  Sometimes in land surveying and technical areas.


1 square decimeter 1 dm²
1 square decimeter is the measurement of area of a one square where each side is 1 dm.



(The picture may not be exactly 1 dm2. It depends on your computer, its settings and your monitor.)

Use: Not so much in everyday life.

Can you say something that is about 1 dm2?
How many dm2 is the area of your computer monitor?


1 square centimeter 1 cm²
1 square centimeter is a square where each side is 1 cm.



(The picture may not be exactly 1 cm2. It depends on your computer, its settings and your monitor.)

How many square centimeters is your nail?



1 square millimeter 1 mm²
1 square millimeter is the measure of the area of a square where each side is 1 mm.