Addition Worksheet

Solve.

1 a. 300 + 90 + _________ = 399
1 b. 10 + 6 + _________ = 516
2 a. _________ + 8 + 300 = 348
2 b. 9 + ______ + 100 = 119
3 a. 80 + _________ + 600 = 680
3 b. _________ + 0 + 500 = 508
4 a. _________ + 600 + 20 = 620
4 b. 400 + _________ + 7 = 487
5 a. _________ + 90 + 500 = 595
5 b. 600 + 80 + _________ = 680
6 a. 9 + _________ + 500 = 519
6 b. ______ + 20 + 100 = 124
7 a. 900 + _________ + 6 = 906
7 b. 6 + 300 + _________ = 396
Page 2

Answer Key

1 a. 9    
1 b. 500    
2 a. 40    
2 b. 10    
3 a. 0    
3 b. 8    
4 a. 0    
4 b. 80    
5 a. 5    
5 b. 0    
6 a. 10    
6 b. 4    
7 a. 0    
7 b. 90    


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