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 scale below.
   
    A. 1 oz B. 0.5 oz
    C. 0.25 oz D. 0.3 oz
    Hint

  3.   Identify the precision unit of the thermometer below.
   
    A. 1°F B. 5°F
    C. 10°F D. 0.5°F
    Hint

  4.   Identify the precision unit of the clock below.
   
    A. 1 h B. 3 h
    C. 30 min D. 1 min
    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. 7
    C. 9 D. 3
    Hint



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