Addition Worksheet

Solve.

1 a. 750 + _________ = 770
1 b. 710 + _________ = 750
2 a. 340 + _________ = 360
2 b. _________ + 50 = 470
3 a. _________ + 20 = 850
3 b. 330 + _________ = 390
4 a. _________ + 30 = 430
4 b. _________ + 60 = 590
5 a. _________ + 40 = 780
5 b. _________ + 20 = 230
6 a. 810 + _________ = 870
6 b. _________ + 80 = 790
7 a. ______ + 40 = 180
7 b. _________ + 50 = 560
8 a. _________ + 50 = 460
8 b. _________ + 10 = 350
9 a. 400 + _________ = 440
9 b. 820 + _________ = 890
10 a. 510 + _________ = 530
10 b. _________ + 40 = 490
Page 2

Answer Key

1 a. 20    
1 b. 40    
2 a. 20    
2 b. 420    
3 a. 830    
3 b. 60    
4 a. 400    
4 b. 530    
5 a. 740    
5 b. 210    
6 a. 60    
6 b. 710    
7 a. 140    
7 b. 510    
8 a. 410    
8 b. 340    
9 a. 40    
9 b. 70    
10 a. 20    
10 b. 450    


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