Physics Practicals (Justification)

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Hello everyone,

I'm a new student for As level and I'm currently 3 subjects only (Biology, Physics and Mathematics). I noticed that in paper 3 physics there is usually a question repeated in almost all of the practical papers.
"Justify the number of significant figures that you have given for your values of k." Well, does it actually mean? Please give me some of your knowledge and tips about that question.

Thank you
 
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