Addition Worksheet

Solve.

1 a. 90 + ______ + 20 = 130
1 b. 80 + 30 + ______ = 120
2 a. ______ + 40 + 80 = 210
2 b. 90 + 70 + ______ = 240
3 a. 60 + 10 + ______ = 110
3 b. 60 + ______ + 20 = 110
4 a. 50 + ______ + 40 = 100
4 b. 40 + ______ + 20 = 150
5 a. _________ + 90 + 70 = 190
5 b. ______ + 30 + 50 = 90
6 a. _________ + 70 + 80 = 210
6 b. 60 + 30 + ______ = 100
7 a. ______ + 20 + 70 = 160
7 b. _________ + 70 + 30 = 150
8 a. 70 + ______ + 70 = 210
8 b. _________ + 20 + 70 = 180
Page 2

Answer Key

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


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