1.   Identify the precision unit of the ruler below.
   
    A. in. B. in.
    C. in. D. 4 in.
    Hint

  2.   Identify the precision unit of the clock below.
   
    A. 1 min B. 3 h
    C. 30 min D. 1 h
    Hint

  3.   Identify the weight shown on the scale using significant digits.
   
    A. 8 kg B. 8.7 kg
    C. 8.6 kg D. 8.65 kg
    Hint

  4.   The temperature at the core of the sun is estimated to be over 15,000,000 degrees Celsius. How many significant digits are in this measurement?
    A. 2 B. 6
    C. 15 D. 8
    Hint

  5.   Maurice Greene of the United States won the 100-meter run in the 2000 Olympics with a time of 9.87 seconds. How many significant digits are in this measurement?
    A. 8 B. 3
    C. 9 D. 7
    Hint



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