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    Teachers have instructed me to give answers in the lowest significant figure. In most of the questions it works out well, but some answers to questions in the marking scheme don't have that followed.
    Example from a marking scheme:

    Spring Constant= 6.4/0.12=53.3

    Now this answer should have clearly been 53 because 2 is the lowest sig fig used in the equation.
    I don't know how the answer is 53.3 rather than 53.
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    My teachers have always told me to go for 3 s.f. if unsure. Significant figures will only cost you one or two marks at worst so don't worry too much about them.
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    I think it's perfectly acceptable to go for one more sf than you were given.

    If not, 3/2 is 2 rather than 1.5 which makes it look absurd.

    As cakeboi says I usually say opt for 3sf if in any doubt

    (except at IB which seems to prefer 2 sf for all final answers)
 
 
 
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