Addition Worksheet

Solve.

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

Answer Key

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


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