Addition Worksheet

Solve.

1 a. 20 + ______ = 40
1 b. 60 + ______ = 100
2 a. 80 + ______ = 140
2 b. ______ + 10 = 60
3 a. ______ + 20 = 60
3 b. ______ + 60 = 150
4 a. ______ + 80 = 120
4 b. 40 + ______ = 130
5 a. 90 + ______ = 120
5 b. ______ + 90 = 130
6 a. ______ + 10 = 50
6 b. 80 + ______ = 100
7 a. 60 + ______ = 120
7 b. 80 + ______ = 160
8 a. ______ + 10 = 20
8 b. 20 + ______ = 90
9 a. ______ + 60 = 100
9 b. 90 + ______ = 150
Page 2

Answer Key

1 a. 20    
1 b. 40    
2 a. 60    
2 b. 50    
3 a. 40    
3 b. 90    
4 a. 40    
4 b. 90    
5 a. 30    
5 b. 40    
6 a. 40    
6 b. 20    
7 a. 60    
7 b. 80    
8 a. 10    
8 b. 70    
9 a. 40    
9 b. 60    


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