Addition Worksheet

Solve.

1 a. 10 + 70 + ______ = 100
 
1 b. 40 + _________ + 50 = 160
 
2 a. _________ + 20 + 40 = 100
 
2 b. ______ + 10 + 70 = 110
 
3 a. 20 + ______ + 50 = 110
 
3 b. 50 + 60 + ______ = 150
 
4 a. ______ + 80 + 10 = 150
 
4 b. 20 + ______ + 10 = 40
 
5 a. 80 + 80 + _________ = 230
 
5 b. ______ + 70 + 40 = 120
 
6 a. 90 + 40 + _________ = 170
 
6 b. ______ + 20 + 50 = 80
 
7 a. 10 + 50 + _________ = 120
 
7 b. 10 + ______ + 20 = 40
 
Page 2

Answer Key

1 a. 20    
1 b. 70    
2 a. 40    
2 b. 30    
3 a. 40    
3 b. 40    
4 a. 60    
4 b. 10    
5 a. 70    
5 b. 10    
6 a. 40    
6 b. 10    
7 a. 60    
7 b. 10    


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