adding and subtracting positive and negative numbers

Quiz yourself by guessing what should be in each of the black rectangles below before clicking on it to display the answer.
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Problem
Answer
2+3  5  
3+9  12  
9-8  1  
100-9  91  
5+8+1  14  
10-5  5  
7-6  1  
5-7  -2  
9-13  -4  
8-9  -1  


   

 
 

 
 

 

 
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