Relate Addition and Subtraction

Answer Key - Grade 1 Math Worksheet

Write the answer on the line, or circle the answer.

1. 1.

   11 + ____ = 16. Which subtraction fact finds the missing number?

   • 16 - 12 = 4
   • 17 - 11 = 6
   • 16 - 10 = 6
   • 16 - 11 = 5
2. 2.

   Use a related fact to solve 5 + 8 = 13.

3. 3.

   Which addition fact checks 14 - 7 = 7?

   • 14 + 7 = 21
   • 7 + 8 = 15
   • 7 + 7 = 14
   • 8 + 7 = 15
4. 4.

   15 - 12 = 3. What missing number belongs in the blank?

5. 5.

   A whole is 15. One part is 9. What is the other part?

   6
6. 6.

   ____ + 3 = 13. Which subtraction fact finds the missing number?

   • 12 - 3 = 9
   • 13 - 4 = 9
   • 13 - 3 = 10
   • 13 - 2 = 11
7. 7.

   8 + 3 = 11. So 11 - 8 = 3

8. 8.

   12 - 7 = 5. Check with addition: 7 + ____ = 12

   5
9. 9.

   Use addition to solve 14 - 5 = 9.

10. 10.

    There are 14 birds in all. 9 are in a tree. The rest are on the grass. How many are on the grass?

    5