Addition Worksheet

Solve.

1 a. 90 + 40 + _________ = 180
1 b. 50 + 40 + ______ = 100
2 a. ______ + 80 + 40 = 190
2 b. ______ + 10 + 10 = 90
3 a. _________ + 90 + 90 = 240
3 b. 20 + 60 + ______ = 110
4 a. 70 + 70 + ______ = 220
4 b. _________ + 60 + 30 = 180
5 a. 30 + ______ + 70 = 130
5 b. _________ + 90 + 20 = 140
6 a. ______ + 70 + 50 = 150
6 b. 50 + 10 + ______ = 80
7 a. ______ + 50 + 40 = 110
7 b. _________ + 90 + 70 = 190
8 a. 10 + ______ + 50 = 140
8 b. 50 + ______ + 20 = 150
9 a. ______ + 60 + 10 = 100
9 b. 60 + ______ + 40 = 170
10 a. 30 + 30 + ______ = 100
10 b. 70 + 90 + _________ = 190
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Answer Key

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

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