Addition Worksheet

Solve.

1 a. ______ + 50 + 40 = 120
1 b. 40 + 70 + ______ = 150
2 a. ______ + 70 + 90 = 190
2 b. ______ + 50 + 10 = 140
3 a. 20 + ______ + 70 = 170
3 b. 50 + 90 + ______ = 180
4 a. 80 + ______ + 30 = 140
4 b. 20 + _________ + 80 = 130
5 a. 30 + 40 + ______ = 80
5 b. 20 + ______ + 30 = 60
6 a. 60 + ______ + 60 = 170
6 b. 30 + 50 + ______ = 160
7 a. 30 + 90 + _________ = 200
7 b. 90 + _________ + 20 = 200
8 a. 20 + 90 + _________ = 200
8 b. 30 + ______ + 60 = 160
Page 2

Answer Key

1 a. 30    
1 b. 40    
2 a. 30    
2 b. 80    
3 a. 80    
3 b. 40    
4 a. 30    
4 b. 30    
5 a. 10    
5 b. 10    
6 a. 50    
6 b. 80    
7 a. 80    
7 b. 90    
8 a. 90    
8 b. 70    


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