Relate Addition and Subtraction

Answer Key - Grade 1 Math Worksheet - Challenge Me

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

1. 1.

   5 + ____ = 14. Which subtraction fact finds the missing number?

   • 14 - 4 = 10
   • 15 - 5 = 10
   • 14 - 5 = 9
   • 14 - 6 = 8
2. 2.

   Use a related fact to solve 13 + 5 = 18.

3. 3.

   Which addition fact checks 20 - 5 = 15?

   • 5 + 15 = 20
   • 20 + 15 = 35
   • 6 + 15 = 21
   • 20 + 5 = 25
4. 4.

   14 - 3 = 11. What missing number belongs in the blank?

5. 5.

   A whole is 17. One part is 14. What is the other part?

   3
6. 6.

   ____ + 9 = 18. Which subtraction fact finds the missing number?

   • 18 - 8 = 10
   • 19 - 9 = 10
   • 18 - 10 = 8
   • 18 - 9 = 9
7. 7.

   8 + 8 = 16. So 16 - 8 = 8

8. 8.

   14 - 2 = 12. Check with addition: 2 + ____ = 14

   12
9. 9.

   Use addition to solve 16 - 4 = 12.

10. 10.

    There are 16 birds in all. 12 are in a tree. The rest are on the grass. How many are on the grass?

    4