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Subtraction within 20 worksheets

Twenty subtraction facts from 11 to 20, in three versions with keys. These are the facts that need regrouping across ten, and most first graders find them the hardest of the year.

Subtraction: within 20

NameDate

Subtract.

Sheet AFree at teach.peabody.kids

Subtraction: within 20

NameDate

Subtract.

Sheet BFree at teach.peabody.kids

Subtraction: within 20

NameDate

Subtract.

Sheet CFree at teach.peabody.kids

Answer key

Sheet A

  1. 10
  2. 11
  3. 16
  4. 10
  5. 10
  6. 16
  7. 11
  8. 9
  9. 13
  10. 11
  11. 12
  12. 9
  13. 16
  14. 14
  15. 6
  16. 13
  17. 8
  18. 7
  19. 12
  20. 10

Sheet B

  1. 5
  2. 10
  3. 15
  4. 9
  5. 15
  6. 15
  7. 9
  8. 4
  9. 5
  10. 11
  11. 4
  12. 12
  13. 2
  14. 7
  15. 9
  16. 16
  17. 10
  18. 14
  19. 4
  20. 7

Sheet C

  1. 9
  2. 14
  3. 13
  4. 12
  5. 8
  6. 7
  7. 14
  8. 7
  9. 9
  10. 8
  11. 8
  12. 11
  13. 6
  14. 19
  15. 7
  16. 8
  17. 6
  18. 6
  19. 11
  20. 5
Answer keyFree at teach.peabody.kids

Subtraction: 20 problems a sheet, 3 versions that do not repeat each other where the numbers allow.

How to use it

  1. Look at the sheet: it is a real, printable sheet. Switch between Sheet A, B and C, or press New numbers (N) for a fresh set.
  2. Change how many problems, how many versions, and whether the key prints. Settings stay in this browser; Share copies a link that rebuilds the same sheets.
  3. Press Print sheet A and key, or Print all. The answer key prints on its own page, so you can keep it back.

Ideas for class

  • Run the sheet with Never regroup in the maker first, so a student can enjoy getting every answer right before the crossing facts arrive.
  • Pair the sheet with a number line to 20 drawn on the desk, and let students hop back on it until they stop needing it.
  • Ask students to say which answers needed two steps. That naming is half of the strategy.

Related

Questions

Why is the starting number never below 11?

Facts from 10 and below are on the subtraction within 10 sheet. This one is for the harder range, so every minuend is a teen number or 20.

Do the answers ever go below zero?

No. The number taken away is never larger than the number it comes from, and it is a single digit, so every answer is a positive whole number or zero.

Are the answer keys checked?

Each answer is worked out by the code that wrote the problem, and our tests recompute every answer a second way and compare. Please still look over the key before you grade a class set.

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What this worksheet covers

Every problem on this sheet starts from a number between 11 and 20 and takes away a single digit, such as 15 − 8 or 13 − 4. When the ones digit of the starting number is smaller than the number taken away, the student has to cross back through ten, which is where most errors happen. The sheet mixes those with the easier ones that do not cross.

Who it is for

Common Core 1.OA.C.6 sets this as grade 1 content, with fluency within 10 as the firm goal, and 2.OA.B.2 asks for fluency within 20 by the end of second grade. Use it once the within 10 facts are secure.

Subtracting from numbers from 11 to 20 · grades 1 and 2

A worked example

For 14 − 6, a student can take away 4 to reach 10, then take away the remaining 2 to land at 8. Writing 14 − 4 = 10, 10 − 2 = 8 on the board shows the move. Ask students to try the same two steps on 13 − 5 and 16 − 9.

Mistakes to watch for

  • Subtracting the smaller digit from the larger in the ones place, so 15 − 8 becomes 13 because 8 − 5 = 3. The ones digit of the answer is not always the difference of the digits.
  • Counting back and losing track, ending one or two away from the answer. Use fingers to track the steps, or a number line.

Make it your own

This sheet is one setting of the math worksheet generator. Open it there to change the skill, the range of numbers or the heading, or to mix several skills on one sheet.