Addition Worksheet

Solve.

1 a. 300 + _________ = 1200
1 b. 500 + _________ = 1400
2 a. 400 + _________ = 400
2 b. 100 + _________ = 400
3 a. _________ + 600 = 1300
3 b. 500 + _________ = 600
4 a. _________ + 400 = 1000
4 b. _________ + 700 = 900
5 a. _________ + 900 = 1600
5 b. 300 + _________ = 900
6 a. _________ + 1000 = 1100
6 b. 300 + _________ = 500
7 a. _________ + 700 = 1300
7 b. 900 + _________ = 1900
8 a. _________ + 800 = 1000
8 b. 800 + _________ = 1400
9 a. 700 + _________ = 1500
9 b. 700 + _________ = 1700
10 a. _________ + 500 = 1100
10 b. 400 + _________ = 800
Page 2

Answer Key

1 a. 900    
1 b. 900    
2 a. 0    
2 b. 300    
3 a. 700    
3 b. 100    
4 a. 600    
4 b. 200    
5 a. 700    
5 b. 600    
6 a. 100    
6 b. 200    
7 a. 600    
7 b. 1000    
8 a. 200    
8 b. 600    
9 a. 800    
9 b. 1000    
10 a. 600    
10 b. 400    


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