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➕ 2nd grade math · Add & Subtract

Quick facts to 20

Some are adding and some are taking away, so look at the sign first. + puts together and makes more. − takes away and leaves fewer.

Worked example

10 − 2 = ?
Answer: 8
Start at 10 and count back 2: 9, 8. So 10 − 2 = 8.

For grown-ups: Know from memory all sums of two one-digit numbers. 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.OA.B.2
What this practises, for teachers

Practices know from memory all sums of two one-digit numbers (2.OA.B.2). A printable sheet with its answer key, worked answers on the page, no accounts.

▶ Practise it

For your class

🖨️ Printable sheet and key

On the board with this skill:

More printables, with answer keys, for this grade:

Try three

  1. 5 + 4 = ?
    Show the answer and how
    Answer: 9
    Start at the bigger number, 5, and count on 4: 6, 7, 8, 9. So 5 + 4 = 9. Or use a double: 4 + 4 = 8, and one more is 9.
  2. 14 − 1 = ?
    Show the answer and how
    Answer: 13
    Start at 14 and count back 1: 13. So 14 − 1 = 13.
  3. 16 − 6 = ?
    Show the answer and how
    Answer: 10
    Think of adding: 6 + 10 = 16. So 16 − 6 = 10.

Before and after

Learn first: Quick facts to 10 (1st)

Name: ____________________Date: ____________Score: ____ / 12

Quick facts to 20 (2nd grade)

  1. 10 − 6 = ?
  2. 3 + 2 = ?
  3. 6 + 4 = ?
  4. 2 + 8 = ?
  5. 6 − 3 = ?
  6. 8 + 4 = ?
  7. 14 − 11 = ?
  8. 4 − 3 = ?
  9. 10 − 2 = ?
  10. 11 + 4 = ?
  11. 13 − 11 = ?
  12. 2 + 6 = ?

Answer key

  1. 4
  2. 5
  3. 10
  4. 10
  5. 3
  6. 12
  7. 3
  8. 1
  9. 8
  10. 15
  11. 2
  12. 8

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