Addition Worksheet

Solve.

1 a. 800 + 70 + _________ = 878
 
1 b. _________ + 6 + 300 = 376
 
2 a. 40 + 2 + _________ = 342
 
2 b. _________ + 60 + 200 = 267
 
3 a. 6 + _________ + 40 = 746
 
3 b. 50 + 9 + _________ = 259
 
4 a. 7 + 50 + _________ = 857
 
4 b. 200 + _________ + 5 = 275
 
5 a. 600 + _________ + 8 = 688
 
5 b. _________ + 80 + 3 = 683
 
6 a. 7 + 70 + _________ = 877
 
6 b. 300 + _________ + 7 = 327
 
7 a. 3 + _________ + 300 = 373
 
7 b. _________ + 20 + 3 = 523
 
8 a. _________ + 70 + 6 = 776
 
8 b. _________ + 400 + 10 = 418
 
Page 2

Answer Key

1 a. 8    
1 b. 70    
2 a. 300    
2 b. 7    
3 a. 700    
3 b. 200    
4 a. 800    
4 b. 70    
5 a. 80    
5 b. 600    
6 a. 800    
6 b. 20    
7 a. 70    
7 b. 500    
8 a. 700    
8 b. 8    


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