Åk 6–9
 
English/Русский

2.5 Approximating
To be able to approximate a number’s size will be a big help to you when you add and subtract.

The more mathematics you learn, the better sense you have for the size and numbers that you will get. Practice by making educated guesses in your head to approximate weights, lengths, times, and costs.


It can happen that you don’t need to calculate an exact sum but instead can give an estimate – this is called approximation.

An example of when it could be good to make a rough estimate is when you go shopping and need to figure out whether you have enough money or when you need to make a budget and decide how much time things will take and when you are going to invite people over to tea and need to calculate the amount of food needed.  


What time do I need to get up if school begins at 8:10?


Foto: Fredrik Enander

Foto: Fredrik Enander

Is 200 kr enough for what I’ve put in my in my grocery basket?



How much juice do I need to mix in order to server 20 people?

Foto: Fredrik Enander




Foto: Fredrik Enander

How many roses can I buy for a hundred crowns?



How far can I ride my moped on a half tank of petrol?

Foto: Fredrik Enander


Foto: Fredrik Enander

How many bottles of juice can I buy for a 100 crowns?