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➕ 2nd grade math · Add & Subtract

Add and subtract to 100

To add, add the tens, then add the ones, then put them together. 34 + 25: 30 + 20 = 50, and 4 + 5 = 9. That's 59.

Worked example

42 + 1 = ?
42+ 1
Answer: 43
Add the tens: 40 + 0 = 40. Add the ones: 2 + 1 = 3. Together: 40 + 3 = 43.
42
+1
43
42+ 1

For grown-ups: Add/subtract within 100 fluently using place-value strategies. Below: three problems to try with the worked answers, and a free printable sheet. Children can practise the same skill as a game, with no sign-up and no ads.

  • CCSS 2.NBT.B.5
What this practises, for teachers

Practices add/subtract within 100 fluently using place-value strategies (2.NBT.B.5). A printable sheet with its answer key, worked answers on the page, no accounts.

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For your class

🖨️ Printable sheet and key

On the board with this skill:

More printables, with answer keys, for this grade:

Try three

  1. 71 + 3 = ?
    71+ 3
    Show the answer and how
    Answer: 74
    Add the tens: 70 + 0 = 70. Add the ones: 1 + 3 = 4. Together: 70 + 4 = 74.
    71
    +3
    74
    71+ 3
  2. 62 + 11 = ?
    62+ 11
    Show the answer and how
    Answer: 73
    Add the tens: 60 + 10 = 70. Add the ones: 2 + 1 = 3. Together: 70 + 3 = 73.
    62
    +11
    73
    62+ 11
  3. 13 + 70 = ?
    13+ 70
    Show the answer and how
    Answer: 83
    Add the tens: 10 + 70 = 80. Add the ones: 3 + 0 = 3. Together: 80 + 3 = 83.
    13
    +70
    83
    13+ 70

Before and after

Learn first: Add with tens and ones (1st)

Comes next: Add four numbers (2nd), Arrays: rows and columns (2nd)

Name: ____________________Date: ____________Score: ____ / 12

Add and subtract to 100 (2nd grade)

  1. 80 + 7 = ?
    80+ 7
  2. 20 + 9 = ?
    20+ 9
  3. 33 + 60 = ?
    33+ 60
  4. 80 + 10 = ?
    80+ 10
  5. 54 + 20 = ?
    54+ 20
  6. 27 + 20 = ?
    27+ 20
  7. 20 + 61 = ?
    20+ 61
  8. 33 + 22 = ?
    33+ 22
  9. 22 + 21 = ?
    22+ 21
  10. 35 + 50 = ?
    35+ 50
  11. 50 + 40 = ?
    50+ 40
  12. 39 + 50 = ?
    39+ 50

Answer key

  1. 87
  2. 29
  3. 93
  4. 90
  5. 74
  6. 47
  7. 81
  8. 55
  9. 43
  10. 85
  11. 90
  12. 89

More 2nd grade skills: all 2nd grade math skills, or every grade at math skills.