Addition Worksheet

Solve.

1 a. ______ + 40 + 30 = 80
1 b. 50 + 10 + ______ = 80
2 a. 30 + ______ + 40 = 80
2 b. 60 + 30 + ______ = 120
3 a. 60 + ______ + 80 = 180
3 b. 20 + 40 + ______ = 110
4 a. ______ + 10 + 30 = 60
4 b. 70 + 80 + ______ = 190
5 a. ______ + 70 + 90 = 170
5 b. 80 + 20 + ______ = 180
6 a. 40 + 30 + ______ = 150
6 b. 90 + 40 + ______ = 170
7 a. 70 + ______ + 30 = 150
7 b. 70 + ______ + 10 = 140
8 a. 60 + ______ + 60 = 150
8 b. ______ + 50 + 20 = 120
Page 2

Answer Key

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


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