Addition Worksheet

Solve.

1 a. 30 + ______ + 10 = 100
1 b. 70 + 60 + _________ = 190
2 a. 50 + _________ + 50 = 160
2 b. 30 + _________ + 50 = 140
3 a. 80 + 80 + _________ = 220
3 b. ______ + 20 + 10 = 100
4 a. 40 + _________ + 20 = 120
4 b. _________ + 30 + 80 = 140
5 a. ______ + 10 + 90 = 110
5 b. 40 + ______ + 60 = 110
6 a. 50 + _________ + 90 = 210
6 b. _________ + 80 + 20 = 140
7 a. 80 + 60 + _________ = 170
7 b. 30 + _________ + 40 = 140
8 a. 30 + _________ + 80 = 180
8 b. ______ + 40 + 30 = 150
Page 2

Answer Key

1 a. 60    
1 b. 60    
2 a. 60    
2 b. 60    
3 a. 60    
3 b. 70    
4 a. 60    
4 b. 30    
5 a. 10    
5 b. 10    
6 a. 70    
6 b. 40    
7 a. 30    
7 b. 70    
8 a. 70    
8 b. 80    


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