Addition Worksheet

Solve.

1 a. 20 + ______ = 100
1 b. 40 + ______ = 50
2 a. ______ + 80 = 90
2 b. 70 + ______ = 90
3 a. 80 + ______ = 100
3 b. 10 + ______ = 90
4 a. 10 + ______ = 80
4 b. 20 + ______ = 110
5 a. ______ + 50 = 70
5 b. 50 + ______ = 90
6 a. ______ + 10 = 50
6 b. ______ + 20 = 80
7 a. 70 + ______ = 130
7 b. 90 + ______ = 180
8 a. ______ + 60 = 80
8 b. ______ + 90 = 140
9 a. 30 + ______ = 110
9 b. 90 + ______ = 110
Page 2

Answer Key

1 a. 80    
1 b. 10    
2 a. 10    
2 b. 20    
3 a. 20    
3 b. 80    
4 a. 70    
4 b. 90    
5 a. 20    
5 b. 40    
6 a. 40    
6 b. 60    
7 a. 60    
7 b. 90    
8 a. 20    
8 b. 50    
9 a. 80    
9 b. 20    


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