

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 100meter 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 


