Addition Worksheet

Solve.

1 a. ______ + 10 = 20
1 b. 20 + ______ = 80
2 a. ______ + 40 = 120
2 b. 60 + ______ = 120
3 a. ______ + 50 = 90
3 b. 80 + ______ = 130
4 a. ______ + 50 = 70
4 b. 80 + ______ = 150
5 a. 40 + ______ = 110
5 b. ______ + 20 = 40
6 a. ______ + 60 = 80
6 b. 40 + ______ = 80
7 a. ______ + 90 = 180
7 b. ______ + 30 = 90
8 a. ______ + 20 = 70
8 b. ______ + 10 = 40
9 a. 50 + ______ = 90
9 b. ______ + 30 = 120
10 a. ______ + 20 = 100
10 b. 20 + ______ = 60
Page 2

Answer Key

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


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