Addition Worksheet

Solve.

1 a. 80 + 5 + _________ = 685
1 b. 40 + 7 + _________ = 247
2 a. 400 + 30 + _________ = 438
2 b. 3 + 10 + _________ = 413
3 a. 5 + 80 + _________ = 385
3 b. ______ + 40 + 100 = 142
4 a. 700 + _________ + 3 = 703
4 b. _________ + 10 + 800 = 818
5 a. 3 + 30 + ______ = 133
5 b. 600 + 70 + _________ = 673
6 a. 5 + _________ + 10 = 615
6 b. _________ + 80 + 300 = 381
7 a. _________ + 900 + 20 = 925
7 b. 2 + 300 + _________ = 372
8 a. 1 + 90 + _________ = 191
8 b. _________ + 40 + 0 = 140
9 a. 40 + _________ + 200 = 249
9 b. 4 + 90 + _________ = 994
10 a. 7 + 50 + _________ = 757
10 b. _________ + 70 + 3 = 173
Page 2

Answer Key

1 a. 600    
1 b. 200    
2 a. 8    
2 b. 400    
3 a. 300    
3 b. 2    
4 a. 0    
4 b. 8    
5 a. 100    
5 b. 3    
6 a. 600    
6 b. 1    
7 a. 5    
7 b. 70    
8 a. 100    
8 b. 100    
9 a. 9    
9 b. 900    
10 a. 700    
10 b. 100    


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