Addition Worksheet

Solve.

1 a. 50 + 40 + ______ = 180
1 b. 90 + ______ + 40 = 140
2 a. 10 + ______ + 90 = 140
2 b. 70 + ______ + 20 = 100
3 a. 50 + 30 + _________ = 140
3 b. 70 + 10 + ______ = 120
4 a. 80 + ______ + 50 = 160
4 b. 10 + ______ + 70 = 110
5 a. 70 + ______ + 20 = 150
5 b. 40 + ______ + 50 = 100
6 a. 60 + 50 + ______ = 140
6 b. ______ + 30 + 30 = 90
7 a. 10 + ______ + 60 = 100
7 b. 40 + 60 + _________ = 180
8 a. ______ + 20 + 60 = 110
8 b. 50 + 30 + ______ = 170
Page 2

Answer Key

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


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