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2nd Grade Operations and Algebraic Thinking- Add and subtract within 20, Standard 2, Post Test 1
Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.



Completion
Complete each statement.
 

 1. 

   8
+ 4
 

 

 2. 

   3
+ 6
 

 

 3. 

   6
+ 7
 

 

 4. 

   4
+ 5
 

 

 5. 

   19
-   6
 

 

 6. 

  11
-   4
 

 

 7. 

  10
-   5
 

 

 8. 

  13
-  7
 

 

 9. 

19 - 11 = 19 - 10 - ____ = 8
 

 

 10. 

17 - 8 = 17 - _____ = 10 - 1 = 9
 

 

 11. 

6 + 9 = 6 + 6 + 3 = 12 + 3 = ____
 

 

 12. 

20 - 12 = 20 - ____ -2 = 8
 

 



 
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