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Accuracy of the answers

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Hey!

I was always told to round up all the answers to 3 significant figures. However when I was doing past papers, I saw that for instance exercises with future value demand 2 decimal places otherwise they do not award points. How come? Are there any more detaile rules? I appreciate all the answers as the exams are tommorow! :o 

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On the front of the exam paper it states "Unless otherwise stated in the question, all numerical answers should be given exactly or correct to three significant figures."

So basically, you should use 3 significant figures unless it says "correct to 2 decimal places" or "correct to the nearest hundred" for example (there are other examples it might say). 

It will always say in the question if they want you to answer giving a specific numerical answer. If the question says nothing just stick to 3 significant figures. 

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