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Grade 1 Addition and Subtraction Within 20 Worksheets

Mental addition and subtraction with numbers up to 20, including the facts that cross ten, such as 8 + 5 and 13 − 6. These are the facts children find hardest in Grade 1, so they get their own sheets.

Ontario 2020 math curriculum, Grade 1: B2.3 · 15 questions per sheet · answers included

Easier sheet

Add a small number to a teen number without crossing 20, such as 12 + 5.

Paperpath
Add and subtract within 20 · Grade 1 · Easier
Name ____________________
Date ____________________

Add and subtract within 20 · 15 questions

  1. 1
    11 + 7 =
  2. 2
    16 + 1 =
  3. 3
    18 + 1 =
  4. 4
    12 + 7 =
  5. 5
    10 + 9 =
  6. 6
    11 + 8 =
  7. 7
    14 + 2 =
  8. 8
    12 + 1 =
  9. 9
    16 + 3 =
  10. 10
    14 + 1 =
  11. 11
    14 + 3 =
  12. 12
    17 + 1 =
  13. 13
    13 + 1 =
  14. 14
    11 + 3 =
  15. 15
    10 + 2 =
Answers: scan the code, or visit paperpath.io/worksheets/grade-1/addition-and-subtraction-within-20
Answers: easier sheet
QuestionAnswer
Q118
Q217
Q319
Q419
Q519
Q619
Q716
Q813
Q919
Q1015
Q1117
Q1218
Q1314
Q1414
Q1512

On level sheet

Add and subtract across ten, such as 8 + 5 and 13 − 6.

Paperpath
Add and subtract within 20 · Grade 1 · On level
Name ____________________
Date ____________________

Add and subtract within 20 · 15 questions

  1. 1
    12 − 9 =
  2. 2
    17 − 9 =
  3. 3
    15 − 6 =
  4. 4
    13 − 8 =
  5. 5
    14 − 5 =
  6. 6
    4 + 9 =
  7. 7
    13 − 6 =
  8. 8
    3 + 8 =
  9. 9
    11 − 4 =
  10. 10
    7 + 9 =
  11. 11
    18 − 9 =
  12. 12
    15 − 8 =
  13. 13
    8 + 6 =
  14. 14
    8 + 9 =
  15. 15
    9 + 5 =
Answers: scan the code, or visit paperpath.io/worksheets/grade-1/addition-and-subtraction-within-20
Answers: on level sheet
QuestionAnswer
Q13
Q28
Q39
Q45
Q59
Q613
Q77
Q811
Q97
Q1016
Q119
Q127
Q1314
Q1417
Q1514

Harder sheet

Find the missing number in an addition or subtraction up to 20.

Paperpath
Add and subtract within 20 · Grade 1 · Harder
Name ____________________
Date ____________________

Add and subtract within 20 · 15 questions

  1. 1
    8 + = 19
  2. 2
    20 − = 12
  3. 3
    18 − = 13
  4. 4
    15 − = 13
  5. 5
    13 − = 5
  6. 6
    5 + = 18
  7. 7
    14 − = 7
  8. 8
    5 + = 16
  9. 9
    5 + = 20
  10. 10
    19 − = 14
  11. 11
    7 + = 15
  12. 12
    18 − = 9
  13. 13
    11 − = 7
  14. 14
    3 + = 18
  15. 15
    9 + = 13
Answers: scan the code, or visit paperpath.io/worksheets/grade-1/addition-and-subtraction-within-20
Answers: harder sheet
QuestionAnswer
Q111
Q28
Q35
Q42
Q58
Q613
Q77
Q811
Q915
Q105
Q118
Q129
Q134
Q1415
Q154

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