Addition Worksheet

Solve.

1 a. 80 + 90 + ______ = 180
1 b. ______ + 70 + 10 = 150
2 a. _________ + 90 + 90 = 270
2 b. 20 + 20 + ______ = 60
3 a. 60 + ______ + 20 = 110
3 b. 80 + 60 + _________ = 220
4 a. _________ + 80 + 60 = 220
4 b. 90 + 20 + _________ = 200
5 a. ______ + 60 + 50 = 180
5 b. ______ + 10 + 90 = 140
6 a. 50 + _________ + 70 = 190
6 b. 90 + ______ + 10 = 130
7 a. 70 + ______ + 70 = 230
7 b. ______ + 30 + 30 = 140
8 a. 70 + 10 + ______ = 90
8 b. 40 + 30 + ______ = 120
Page 2

Answer Key

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


Copying permission: You are free to copy this worksheet to any number of students for their mathematics work. Do not distribute on websites, books, or any such material without permission. Copyright www.HomeschoolMath.net