Addition Worksheet

Solve.

1 a. 40 + ______ = 100
1 b. 20 + ______ = 80
2 a. ______ + 80 = 130
2 b. ______ + 30 = 80
3 a. 50 + ______ = 100
3 b. ______ + 20 = 30
4 a. ______ + 40 = 130
4 b. ______ + 60 = 130
5 a. ______ + 30 = 60
5 b. 50 + ______ = 80
6 a. 80 + ______ = 100
6 b. 70 + ______ = 140
7 a. 60 + ______ = 80
7 b. 50 + ______ = 70
8 a. 50 + ______ = 110
8 b. ______ + 90 = 160
9 a. 40 + ______ = 110
9 b. ______ + 80 = 140
10 a. ______ + 70 = 80
10 b. ______ + 20 = 80
Page 2

Answer Key

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


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