Addition Worksheet

Solve.

1 a. 450 + _________ = 480
1 b. 360 + _________ = 370
2 a. 420 + _________ = 470
2 b. 410 + _________ = 480
3 a. 870 + _________ = 890
3 b. 210 + _________ = 250
4 a. _________ + 40 = 870
4 b. 110 + ______ = 130
5 a. 340 + _________ = 350
5 b. _________ + 20 = 730
6 a. 430 + _________ = 450
6 b. 300 + _________ = 330
7 a. 680 + _________ = 680
7 b. _________ + 30 = 890
8 a. _________ + 30 = 540
8 b. _________ + 10 = 520
9 a. 410 + _________ = 470
9 b. 300 + _________ = 350
10 a. _________ + 50 = 650
10 b. _________ + 40 = 880
Page 2

Answer Key

1 a. 30    
1 b. 10    
2 a. 50    
2 b. 70    
3 a. 20    
3 b. 40    
4 a. 830    
4 b. 20    
5 a. 10    
5 b. 710    
6 a. 20    
6 b. 30    
7 a. 0    
7 b. 860    
8 a. 510    
8 b. 510    
9 a. 60    
9 b. 50    
10 a. 600    
10 b. 840    


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