Addition Worksheet

Solve.

1 a. _________ + 30 = 255
1 b. _________ + 30 = 358
2 a. 348 + _________ = 358
2 b. _________ + 30 = 399
3 a. 149 + ______ = 169
3 b. _________ + 20 = 379
4 a. _________ + 50 = 399
4 b. 307 + _________ = 357
5 a. 801 + _________ = 851
5 b. 241 + _________ = 291
6 a. _________ + 70 = 292
6 b. _________ + 10 = 345
7 a. 584 + _________ = 594
7 b. 101 + ______ = 111
8 a. _________ + 20 = 376
8 b. ______ + 0 = 153
9 a. _________ + 20 = 383
9 b. 132 + ______ = 162
10 a. _________ + 40 = 553
10 b. 631 + _________ = 681
Page 2

Answer Key

1 a. 225    
1 b. 328    
2 a. 10    
2 b. 369    
3 a. 20    
3 b. 359    
4 a. 349    
4 b. 50    
5 a. 50    
5 b. 50    
6 a. 222    
6 b. 335    
7 a. 10    
7 b. 10    
8 a. 356    
8 b. 153    
9 a. 363    
9 b. 30    
10 a. 513    
10 b. 50    

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