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    Hi,

    I'm confused about when to round and to how many decimal places in M1 & M2.
    Is it always to 2 significant figures when using g as 9.8? Or does it not matter?

    Thanks in advance
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    (Original post by JLegion)
    Hi,

    I'm confused about when to round and to how many decimal places in M1 & M2.
    Is it always to 2 significant figures when using g as 9.8? Or does it not matter?

    Thanks in advance
    Exam board?

    For Edexcel you must always use 2 or 3sf in your final answer if you've used g in your working.

    E.g. you could get an answer of 120g which you may think is fine to write as 1176. But you would lose a mark since it is not rounded to 2 or 3sf.
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    I know for aqa I think g is always 9.8 but they will accept answers used with 9.81 or watever not sure bput rounding other things as I hav the same problem I just write it all out and round to 3 s.f at the end which is kind of weird

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    (Original post by notnek)
    Exam board?

    For Edexcel you must always use 2 or 3sf in your final answer if you've used g in your working.

    E.g. you could get an answer of 120g which you may think is fine to write as 1176. But you would lose a mark since it is not rounded to 2 or 3sf.
    Yes, edexcel.

    So for long SUVAT questions, requiring several approximations, should I leave each result in terms of g?
    Also, is it acceptable to leave my answers in terms of g (unless the Q says otherwise)?
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    (Original post by JLegion)
    Yes, edexcel.

    So for long SUVAT questions, requiring several approximations, should I leave each result in terms of g?
    Also, is it acceptable to leave my answers in terms of g (unless the Q says otherwise)?
    Do both. There is no harm in writing the answer in both forms as then whatever the mark scheme wants you will have satisfied it
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    (Original post by JLegion)
    Yes, edexcel.

    So for long SUVAT questions, requiring several approximations, should I leave each result in terms of g?
    Also, is it acceptable to leave my answers in terms of g (unless the Q says otherwise)?
    Yes it's good practice to leave all working steps in terms of g.

    For the answer you can usually leave it in terms of g but I would always check the question. It's safer just to round all your answers to 2 or 3 sf.
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    (Original post by notnek)
    Yes it's good practice to leave all working steps in terms of g.

    For the answer you can usually leave it in terms of g but I would always check the question. It's safer just to round all your answers to 2 or 3 sf.
    Great, thanks. You've probably saved me around 8 marks per paper.
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    3 sig figs if in doubt
 
 
 
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