Addition Worksheet

Solve.

1 a. 60 + _________ + 20 = 160
 
1 b. _________ + 60 + 30 = 130
 
2 a. 20 + _________ + 50 = 120
 
2 b. 10 + _________ + 40 = 130
 
3 a. ______ + 10 + 50 = 120
 
3 b. 20 + 10 + ______ = 70
 
4 a. 70 + 90 + _________ = 220
 
4 b. 70 + 20 + ______ = 100
 
5 a. ______ + 60 + 40 = 120
 
5 b. _________ + 50 + 90 = 210
 
6 a. _________ + 30 + 60 = 180
 
6 b. ______ + 20 + 20 = 120
 
7 a. 90 + 50 + _________ = 200
 
7 b. 60 + 20 + ______ = 100
 
Page 2

Answer Key

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


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