Addition Worksheet

Solve.

1 a. ______ + 40 + 10 = 80
 
1 b. ______ + 20 + 50 = 110
 
2 a. 50 + 30 + ______ = 140
 
2 b. 10 + 60 + _________ = 150
 
3 a. 30 + 80 + ______ = 150
 
3 b. ______ + 10 + 60 = 110
 
4 a. 30 + 90 + _________ = 150
 
4 b. 50 + 50 + ______ = 180
 
5 a. 90 + _________ + 10 = 180
 
5 b. 80 + _________ + 40 = 170
 
6 a. 10 + 50 + ______ = 140
 
6 b. _________ + 50 + 60 = 140
 
7 a. 80 + ______ + 80 = 180
 
7 b. 60 + 80 + _________ = 210
 
Page 2

Answer Key

1 a. 30    
1 b. 40    
2 a. 60    
2 b. 80    
3 a. 40    
3 b. 40    
4 a. 30    
4 b. 80    
5 a. 80    
5 b. 50    
6 a. 80    
6 b. 30    
7 a. 20    
7 b. 70    


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