Addition Worksheet

Solve.

1 a. _________ + 80 + 90 = 240
 
1 b. 70 + 70 + _________ = 210
 
2 a. ______ + 40 + 10 = 70
 
2 b. 60 + _________ + 40 = 160
 
3 a. _________ + 80 + 80 = 250
 
3 b. _________ + 90 + 90 = 230
 
4 a. 20 + 70 + ______ = 140
 
4 b. 20 + 90 + ______ = 120
 
5 a. 10 + 90 + _________ = 160
 
5 b. 80 + _________ + 30 = 190
 
6 a. 90 + 20 + ______ = 120
 
6 b. 80 + 40 + _________ = 210
 
7 a. _________ + 70 + 70 = 150
 
7 b. 50 + ______ + 80 = 220
 
Page 2

Answer Key

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


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