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Homework Help: Confusion regarding significant figures in answers

  1. Jan 26, 2017 #1
    1. The problem statement, all variables and given/known data
    I'm working through some exercises in which I'm supposed to convert various units of speed from SI units to other units
    Example: 0.4m/s into km/h

    2. Relevant equations

    3. The attempt at a solution
    Having checked, I know my answer to be (to 3 significant figures) correct. My confusion arises regarding significant figures. Wouldn't 0.4 be 1 significant figure, which, if I remember and understand correctly, influences how the answer must be expressed, which in turn would leave me with a answer value of 1.
  2. jcsd
  3. Jan 26, 2017 #2


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    Gold Member

    Doesn't the exercise state explicitly how many significant figures are needed for the result?
  4. Jan 26, 2017 #3
    It's okay. I worked out where I was going wrong.
  5. Jan 27, 2017 #4
    did you get the answer? when you are multiplying 2(or more) terms, the answer should contain as much as significant figures which is equivalent to that of the least number of significant figures containing term in the question.
  6. Jan 27, 2017 #5
    oops sorry, just now i have seen that it's marked solved.ignore my useless rambling then :p
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