Addition Worksheet

Solve.

1 a. 80 + 50 + ______ + 60 = 270
1 b. 60 + 30 + 20 + ______ = 120
2 a. 20 + ______ + 10 + 70 = 150
2 b. 50 + 20 + ______ + 20 = 110
3 a. 80 + 50 + ______ + 20 = 210
3 b. 10 + 20 + 80 + ______ = 120
4 a. 80 + ______ + 70 + 10 = 170
4 b. 50 + 50 + ______ + 10 = 200
5 a. ______ + 30 + 10 + 50 = 110
5 b. ______ + 10 + 10 + 70 = 140
6 a. 10 + 50 + 20 + ______ = 140
6 b. 50 + ______ + 30 + 90 = 200
7 a. ______ + 10 + 40 + 30 = 90
7 b. 30 + ______ + 60 + 50 = 220
8 a. 20 + 40 + ______ + 70 = 150
8 b. 20 + ______ + 20 + 20 = 140
Page 2

Answer Key

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

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