Addition Worksheet

Solve.

1 a. ______ + 10 + 40 = 120
1 b. 10 + _________ + 70 = 140
2 a. 50 + 70 + ______ = 160
2 b. _________ + 90 + 80 = 240
3 a. ______ + 40 + 40 = 140
3 b. 40 + 80 + ______ = 160
4 a. 20 + ______ + 10 = 60
4 b. 70 + 90 + _________ = 180
5 a. 10 + ______ + 10 = 70
5 b. _________ + 90 + 90 = 220
6 a. 20 + 90 + ______ = 160
6 b. ______ + 40 + 40 = 150
7 a. 70 + ______ + 20 = 120
7 b. 20 + ______ + 20 = 60
8 a. ______ + 40 + 70 = 170
8 b. ______ + 80 + 70 = 170
Page 2

Answer Key

1 a. 70    
1 b. 60    
2 a. 40    
2 b. 70    
3 a. 60    
3 b. 40    
4 a. 30    
4 b. 20    
5 a. 50    
5 b. 40    
6 a. 50    
6 b. 70    
7 a. 30    
7 b. 20    
8 a. 60    
8 b. 20    


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