Adding and subtracting two two-digit numbers · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.

Adding two two-digit numbers

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

  1. What is 4 + 7 when you add the ones in 34 + 27?

    • 10
    • 11
    • 12

  2. Mia says to add 34 + 27 she can add 30 + 20 and 4 + 7. Is that a good plan?

    Circle one:   True   False

  3. What is 25 + 15?

    • 50
    • 40
    • 30
    • 35

  4. To add 34 + 27, what do you add first?

    • The tens: 30 + 20
    • Only the ones
    • The biggest digit only

  5. What is 27 + 33?

    Answer: ______________

  6. What is 52 - 14?

    • 40
    • 36
    • 38
    • 48

  7. What is 63 - 28? Hint: 63 - 20 = 43.

    Answer: ______________

  8. Which strategy could you use to solve 52 + 39?

    • Add the tens, add the ones, then combine
    • Only add the ones digits
    • Guess a number close to 50

  9. Zoe added 38 + 24. She wrote: tens 30 + 20 = 50, ones 8 + 4 = 12, total 50 + 12 = 62. Did she make a mistake?

    • Yes, the total should be 52
    • Yes, the total should be 72
    • No, 62 is correct

  10. What is 58 + 26?

    • 74
    • 82
    • 94
    • 84
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Answer key

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

Adding two two-digit numbers W1-mt_UQnAFPs83F-s1

  1. 11 · 4 + 7 = 11. That is 1 ten and 1 one.
  2. True · Yes. Splitting into tens and ones is a strong strategy.
  3. 40 · 25 plus 15 equals 40.
  4. The tens: 30 + 20 · Start with the tens, then add the ones. 30 + 20 = 50.
  5. 60 · 27 plus 33 equals 60.
  6. 38 · 52 minus 14 equals 38.
  7. 35 · 63 minus 28 equals 35.
  8. Add the tens, add the ones, then combine · Splitting into tens and ones works for any two two-digit numbers.
  9. No, 62 is correct · 50 + 12 = 62, and she moved the extra ten from 12 correctly. Her answer is right.
  10. 84 · 58 plus 26 equals 84.
Worksheet · LightMySky