Addition Worksheet

Solve.

1 a. _________ + 50 + 90 = 220
 
1 b. _________ + 80 + 90 = 260
 
2 a. 70 + 80 + _________ = 160
 
2 b. 30 + ______ + 10 = 110
 
3 a. 60 + 80 + ______ = 160
 
3 b. 80 + _________ + 20 = 170
 
4 a. _________ + 60 + 70 = 140
 
4 b. 80 + ______ + 20 = 150
 
5 a. ______ + 40 + 20 = 70
 
5 b. 50 + 60 + _________ = 160
 
6 a. 80 + 70 + _________ = 220
 
6 b. ______ + 10 + 70 = 120
 
7 a. 90 + _________ + 10 = 160
 
7 b. _________ + 60 + 20 = 170
 
Page 2

Answer Key

1 a. 80    
1 b. 90    
2 a. 10    
2 b. 70    
3 a. 20    
3 b. 70    
4 a. 10    
4 b. 50    
5 a. 10    
5 b. 50    
6 a. 70    
6 b. 40    
7 a. 60    
7 b. 90    


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