Lesson 2

In Try This 3 you may have found that tools with different precisions are appropriate for different jobs. Tools with a small precision have a small uncertainty and are good for jobs that require precise measurements. Tools with a larger precision have a larger uncertainty and are good for jobs when approximate measures are acceptable. When considering measurements with uncertainties there are situations, such as when installing flooring, when you need to add or subtract the measurements in order to make the pieces fit together.

Try This 4

1. Consider the addition (15 ± 0.5 L) + (24 ± 0.5 L). Describe a method you think may be used to add these two measurements with uncertainties.
   
   To see a method used to add measurements with uncertainties watch Adding Measurements with Uncertainties.
   
   
    
   
2. What is the rule for adding measurements with uncertainties?
3. Consider the subtraction (32 ± 0.5 L) − (21 ± 0.5 L). Describe a method you think may be used to subtract these two measurements with uncertainties.
   
   To see a method used to subtract measurements with uncertainties watch Subtracting Measurements with Uncertainties.
   
   
    
   
4. What is the rule for subtracting measurements with uncertainties?

Save your responses in your course folder.

Share 2

With a partner or in a group, share your rules for adding and subtracting measurements with uncertainty.

Save your responses in your course folder.