Mental addition and subtraction (age 6+) · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.

Adding and taking away in your head

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

  1. What is 58 − 5?

    • 63
    • 53
    • 52

  2. What is 52 - 4?

    • 48
    • 49
    • 47
    • 46

  3. What is 36 + 7?

    Answer: ______________

  4. What is 24 + 3?

    • 26
    • 27
    • 28

  5. 36 + 7 = 43 can be checked with 43 - 7 = 36. Is that check right?

    Circle one:   True   False

  6. What is 63 - 6?

    • 55
    • 57
    • 56
    • 58

  7. What is 47 + 5?

    Answer: ______________

  8. What is 52 − 4?

    • 46
    • 47
    • 48

  9. Leo says: '38 + 6 = 314, because 3 stays put and 8 + 6 = 14.' What went wrong?

    • He forgot that the extra ten from 14 needs to bridge into the tens place
    • He should have subtracted instead of added
    • He added the wrong ones digits

  10. Eva says 62 - 9 = 51. Is Eva right?

    Circle one:   True   False

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Answer key

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

Adding and taking away in your head W1-mt_AKAtWEwpcj-s1

  1. 53 · The tens digit stays 5. Subtract the ones: 8 − 5 = 3, so 53.
  2. 48 · 52 - 2 - 2 = 48.
  3. 43 · 36 + 4 + 3 = 43.
  4. 27 · The tens digit stays 2. Add the ones: 4 + 3 = 7, so 27.
  5. True · Right: 43 - 7 = 36.
  6. 57 · 63 - 3 - 3 = 57.
  7. 52 · 47 + 3 + 2 = 52.
  8. 48 · 52 − 2 = 50, then 50 − 2 = 48.
  9. He forgot that the extra ten from 14 needs to bridge into the tens place · 8 + 6 = 14. That extra ten hops over to the tens place, so 38 + 6 = 44, not 314.
  10. False · Eva is wrong: 62 - 2 - 7 = 53.
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