Addition Worksheet

Solve.

1 a. 350 + _________ = 370
1 b. ______ + 40 = 170
2 a. _________ + 10 = 770
2 b. 620 + _________ = 680
3 a. 210 + _________ = 230
3 b. 200 + _________ = 220
4 a. _________ + 20 = 890
4 b. 220 + _________ = 270
5 a. _________ + 10 = 840
5 b. 810 + _________ = 870
6 a. 420 + _________ = 430
6 b. _________ + 10 = 540
7 a. _________ + 10 = 870
7 b. 800 + _________ = 890
8 a. _________ + 20 = 650
8 b. 650 + _________ = 690
9 a. 650 + _________ = 670
9 b. 510 + _________ = 550
10 a. 620 + _________ = 690
10 b. 700 + _________ = 770
Page 2

Answer Key

1 a. 20    
1 b. 130    
2 a. 760    
2 b. 60    
3 a. 20    
3 b. 20    
4 a. 870    
4 b. 50    
5 a. 830    
5 b. 60    
6 a. 10    
6 b. 530    
7 a. 860    
7 b. 90    
8 a. 630    
8 b. 40    
9 a. 20    
9 b. 40    
10 a. 70    
10 b. 70    


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