Addition Worksheet

Solve.

1 a. _________ + 20 = 850
1 b. 280 + _________ = 290
2 a. _________ + 10 = 320
2 b. 540 + _________ = 590
3 a. _________ + 0 = 290
3 b. _________ + 30 = 260
4 a. _________ + 50 = 380
4 b. 820 + _________ = 840
5 a. 200 + _________ = 290
5 b. ______ + 20 = 180
6 a. _________ + 30 = 350
6 b. _________ + 20 = 880
7 a. 160 + ______ = 180
7 b. 550 + _________ = 590
8 a. 720 + _________ = 780
8 b. 700 + _________ = 780
9 a. _________ + 10 = 430
9 b. 530 + _________ = 550
10 a. _________ + 50 = 470
10 b. _________ + 20 = 270
Page 2

Answer Key

1 a. 830    
1 b. 10    
2 a. 310    
2 b. 50    
3 a. 290    
3 b. 230    
4 a. 330    
4 b. 20    
5 a. 90    
5 b. 160    
6 a. 320    
6 b. 860    
7 a. 20    
7 b. 40    
8 a. 60    
8 b. 80    
9 a. 420    
9 b. 20    
10 a. 420    
10 b. 250    


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