Addition Worksheet

Solve.

1 a. 90 + ______ = 170
1 b. 10 + ______ = 90
2 a. ______ + 80 = 90
2 b. 90 + ______ = 160
3 a. 20 + ______ = 40
3 b. 20 + ______ = 70
4 a. 10 + ______ = 80
4 b. 90 + ______ = 150
5 a. 40 + ______ = 130
5 b. ______ + 50 = 110
6 a. 70 + ______ = 90
6 b. 80 + ______ = 150
7 a. ______ + 90 = 160
7 b. 90 + ______ = 110
8 a. 50 + ______ = 80
8 b. 10 + ______ = 30
9 a. 70 + ______ = 150
9 b. 60 + ______ = 110
Page 2

Answer Key

1 a. 80    
1 b. 80    
2 a. 10    
2 b. 70    
3 a. 20    
3 b. 50    
4 a. 70    
4 b. 60    
5 a. 90    
5 b. 60    
6 a. 20    
6 b. 70    
7 a. 70    
7 b. 20    
8 a. 30    
8 b. 20    
9 a. 80    
9 b. 50    


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