Addition Worksheet

Solve.

1 a. 20 + ______ + 30 = 80
1 b. ______ + 50 + 80 = 220
2 a. _________ + 60 + 70 = 220
2 b. 10 + 20 + ______ = 80
3 a. 30 + 80 + ______ = 120
3 b. ______ + 70 + 10 = 150
4 a. 50 + 50 + _________ = 190
4 b. ______ + 40 + 70 = 170
5 a. ______ + 20 + 80 = 150
5 b. ______ + 60 + 30 = 140
6 a. 40 + 30 + ______ = 110
6 b. _________ + 30 + 90 = 190
7 a. 90 + ______ + 20 = 140
7 b. ______ + 30 + 10 = 130
8 a. 30 + 20 + _________ = 100
8 b. 10 + ______ + 50 = 100
Page 2

Answer Key

1 a. 30    
1 b. 90    
2 a. 90    
2 b. 50    
3 a. 10    
3 b. 70    
4 a. 90    
4 b. 60    
5 a. 50    
5 b. 50    
6 a. 40    
6 b. 70    
7 a. 30    
7 b. 90    
8 a. 50    
8 b. 40    


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