Significant Figures Worksheet - Answer Key

 

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  1. Why are significant figures important?

    Significant figures indicate the degree of certainty that a value has. 

    2.  

     

  2. How many significant figures are in the following numbers

      3.  

    1. 30,100 - Three

      2.  

    2. 30,000. – Five

      3.  

    3. 50,000 – One

      4.  

    4. 0.00030 – Two

      5.  

    5. 2.54 exactly – Infinite

      6.  

    6. 5.82 x 103 – Three

     

     

  3. Rules for carrying over significant figures

      4.  

    1. Addition/Subtraction

      Based on number that has fewest decimal places.

        2.  

      1. How many significant figures would the answer have for
        5.42 +13.159 = 18.58
    2. Multiplication/Division

      Based on the value that has the smallest number of digits.

        3.  

      1. How many significant figures would the answer have for
        (53298) x (432) = 2.30 x 107

       

  4. What is dimensional analysis?

    Conversion from one set of units to another.

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  5. Perform the following calculation

      6.  

    1. 32 cm3 = 0.032 L

      2.  

    2. 100.0 yards = 9144 cm

      3.  

    3. 5 m3 = 5,000,000  cm3

      4.  

    4. 455 seconds =  7.58  minutes

      5.  

    5. 25.6oC = 298.7 K

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