Åk 6–9
 
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3.7 Calculation in general terms
When approximating, you need to look at the numbers and the operation needed and make a judgement about how to approximate. You round off the number before you do any calculations.


Approximation when multiplying
Here below are three examples of how you can approximate when multiplying.  Look at them and think about how you would do it.

Investigate which of the example or examples above are suitable to use when approximating and answer the question below:



Approximation when dividing
Here below are three examples of how you can approximate when dividing.  Look at them and think about how you would do them.



Investigate which of the above example or examples is most suitable to use when approximating and answer the question below.