Addition Worksheet

Solve.

1 a. _________ + 40 = 880
1 b. 810 + _________ = 860
2 a. 820 + _________ = 850
2 b. ______ + 40 = 140
3 a. 870 + _________ = 890
3 b. _________ + 10 = 670
4 a. 300 + _________ = 320
4 b. _________ + 30 = 950
5 a. 420 + _________ = 490
5 b. _________ + 20 = 250
6 a. 200 + _________ = 270
6 b. _________ + 50 = 690
7 a. _________ + 20 = 770
7 b. 210 + _________ = 260
8 a. _________ + 10 = 470
8 b. 510 + _________ = 530
9 a. 900 + _________ = 920
9 b. _________ + 30 = 690
10 a. _________ + 30 = 360
10 b. 140 + ______ = 180
Page 2

Answer Key

1 a. 840    
1 b. 50    
2 a. 30    
2 b. 100    
3 a. 20    
3 b. 660    
4 a. 20    
4 b. 920    
5 a. 70    
5 b. 230    
6 a. 70    
6 b. 640    
7 a. 750    
7 b. 50    
8 a. 460    
8 b. 20    
9 a. 20    
9 b. 660    
10 a. 330    
10 b. 40    


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