Addition Worksheet

Solve.

1 a. 10 + ______ + 70 = 140
1 b. ______ + 80 + 20 = 160
2 a. ______ + 20 + 90 = 120
2 b. ______ + 10 + 70 = 150
3 a. 50 + ______ + 30 = 90
3 b. ______ + 10 + 30 = 110
4 a. 80 + ______ + 40 = 130
4 b. 90 + 70 + _________ = 240
5 a. 50 + ______ + 50 = 130
5 b. _________ + 40 + 90 = 190
6 a. 80 + 50 + ______ = 140
6 b. 30 + 50 + _________ = 140
7 a. 80 + 90 + _________ = 250
7 b. ______ + 80 + 40 = 130
8 a. 50 + 90 + _________ = 220
8 b. 50 + ______ + 20 = 120
Page 2

Answer Key

1 a. 60    
1 b. 60    
2 a. 10    
2 b. 70    
3 a. 10    
3 b. 70    
4 a. 10    
4 b. 80    
5 a. 30    
5 b. 60    
6 a. 10    
6 b. 60    
7 a. 80    
7 b. 10    
8 a. 80    
8 b. 50    


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