Let's see how well you learned the lesson!  Practice your knowledge of additive inverses by doing these problems on another piece of paper.  After you have finished all six problems, see how well you did!  If you missed some, click on the "why" link at the bottom to compare your work with the correct work. 

 

What is the additive inverse of (-19)?
 
What is the additive inverse of  21?   
 
Solve for x:    x + 13 = 21                      
 
Solve for x:    x + (-10) =  10                 
 
Solve for x:  23 + x = 50            
 
Solve for x:   x - 18 = -50                     
 


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