Unknown in Addition & Subtraction · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.

Finding the Missing Number

Mathematics · Addition & Subtraction · ages 6-7
Name ______________________   Date ____________

  1. 8 + ? = 11. What number is missing?

    01234567891011

    Answer: ______________

  2. 5 = ? - 3. What should go in the box?

    • 8
    • 7
    • 9
    • 6

  3. 6 + 6 = ?. What should go in the box?

    Answer: ______________

  4. 6 + 6 = □. What number goes in the box?

    Answer: ______________

  5. ? = 4 + 4 means the box holds 8. Is that right?

    Circle one:   True   False

  6. 13 - ? = 6. What should go in the box?

    • 9
    • 7
    • 6
    • 8

  7. 7 = ? - 4. What should go in the box?

    Answer: ______________

  8. 7 + 7 = □. Which number is the box?

    • 13
    • 14
    • 15

  9. Ana solves 8 + ? = 11 by writing ? = 11 + 8 = 19. What mistake did she make?

    • She added instead of subtracting
    • She forgot to write the answer
    • She used the wrong equals sign

  10. 3 = 11 - ? means ? = 14. Is that right?

    Circle one:   True   False

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Answer key

For grown-ups. Fold this page away before handing over the rest.

Finding the Missing Number W1-mt_3JgrHY221M-s1

  1. 3 · Start at 8 and hop to 11. That is 3 hops, so ? = 3.
  2. 8 · 5 + 3 = 8.
  3. 12 · Double 6 is 12.
  4. 12 · Add 6 and 6 together. 6 + 6 = 12.
  5. True · Right: 4 + 4 = 8.
  6. 7 · 6 + 7 = 13, so ? = 7.
  7. 11 · 7 + 4 = 11.
  8. 14 · 7 + 7 = 14. Count carefully so you do not land on 13 or 15.
  9. She added instead of subtracting · To undo an addition, subtract. Ana should have found 11 − 8 = 3.
  10. False · Wrong: 11 - 8 = 3, so ? = 8.
Worksheet · LightMySky