Addition Worksheet

Solve.

1 a. 80 + ______ + 20 = 120
1 b. 40 + ______ + 30 = 90
2 a. 60 + _________ + 90 = 220
2 b. 80 + 30 + ______ = 130
3 a. 70 + 60 + ______ = 170
3 b. _________ + 80 + 90 = 200
4 a. 20 + 20 + ______ = 70
4 b. ______ + 20 + 80 = 150
5 a. 40 + 80 + ______ = 130
5 b. 10 + 60 + ______ = 140
6 a. 30 + 90 + ______ = 160
6 b. 20 + 50 + ______ = 80
7 a. 20 + 40 + _________ = 150
7 b. 10 + ______ + 50 = 140
8 a. 90 + _________ + 80 = 240
8 b. 20 + 40 + ______ = 130
Page 2

Answer Key

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


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