Addition Worksheet

Solve.

1 a. _________ + 90 = 390
1 b. 850 + _________ = 870
2 a. 560 + _________ = 570
2 b. 370 + _________ = 390
3 a. 760 + _________ = 780
3 b. 310 + _________ = 340
4 a. 310 + _________ = 370
4 b. _________ + 50 = 490
5 a. 520 + _________ = 540
5 b. _________ + 30 = 560
6 a. 120 + ______ = 140
6 b. 680 + _________ = 690
7 a. 400 + _________ = 470
7 b. _________ + 70 = 770
8 a. _________ + 60 = 870
8 b. _________ + 10 = 380
9 a. 750 + _________ = 770
9 b. _________ + 40 = 870
10 a. _________ + 40 = 240
10 b. 120 + ______ = 170
Page 2

Answer Key

1 a. 300    
1 b. 20    
2 a. 10    
2 b. 20    
3 a. 20    
3 b. 30    
4 a. 60    
4 b. 440    
5 a. 20    
5 b. 530    
6 a. 20    
6 b. 10    
7 a. 70    
7 b. 700    
8 a. 810    
8 b. 370    
9 a. 20    
9 b. 830    
10 a. 200    
10 b. 50    


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