1OA3.1
 
Name: 
 

1OA3.1



Completion
Complete each statement.
 

 1. 

Solve the following number sentence. If 13 + 5 = 18; then 5 + 13= ?
 

 

 2. 

Solve the following number sentence.  If 9 + 7 = 16; then ? + 9 = 16 .
 

 

 3. 

Find the missing addend.  If 8 + 4 = 12; then 4 + ? =12.
 

 

 4. 

Find the missing number that makes the following number sentence true.  If 6 + 9 = 15; then  ? + 6 = 15.
 

 

 5. 

Solve the following problem.  If 11 + 9 = 20; then 9 + 11= ?.
 

 

 6. 

Find the missing addend.  If 13 - 5 = 8; then 8 + ? =13.
 

 

 7. 

Find the missing addend.  If 3 + 16 = 19; then ? +3 = 19.
 

 

 8. 

Find the missing number that would make this sentence true:  If 11 - 3 = 8; then 3 + ? = 11.
 

 

 9. 

If 5 + 9 = 14; then 9 + 5= ?
 

 

 10. 

Find the missing addend.  If 8 + 7 = 15; then 7 + ? =15.
 

 



 
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