3 Digit Addition and Subtraction Worksheets: Both Signs on a Page

Press Make a new sheet for new problems with both signs, or choose the regrouping under Sheet type, then Print.

12 problems. Plus and minus mixed, 3-digit, with room to work. Sheet 4EGZOT, with its answer key.

Plus and minus mixed, 3-digit, with room to work

Name Date Score / 12

Read each sentence and write the missing number.

  1. 1.207 + 319 = ________
  2. 2.389 + 113 = ________
  3. 3.916 − 579 = ________
  4. 4.316 − 133 = ________
  5. 5.993 − 741 = ________
  6. 6.971 − 109 = ________
  7. 7.600 + 358 = ________
  8. 8.209 + 574 = ________
  9. 9.898 − 186 = ________
  10. 10.665 + 197 = ________
  11. 11.734 − 196 = ________
  12. 12.212 + 157 = ________

Sheet 4EGZOT · Made at homeroomtools.com

Answer key. Plus and minus mixed, 3-digit, with room to work

  1. 1.207 + 319 = 526
  2. 2.389 + 113 = 502
  3. 3.916 − 579 = 337
  4. 4.316 − 133 = 183
  5. 5.993 − 741 = 252
  6. 6.971 − 109 = 862
  7. 7.600 + 358 = 958
  8. 8.209 + 574 = 783
  9. 9.898 − 186 = 712
  10. 10.665 + 197 = 862
  11. 11.734 − 196 = 538
  12. 12.212 + 157 = 369

Sheet 4EGZOT · Made at homeroomtools.com

Next step More 3-digit addition sheetsBuild any math worksheet

How it works

On these 3 digit addition and subtraction worksheets plus and minus share one page, all within 1,000. Pupils read each sign, set the numbers out in columns, and work.

Read the full guide

Read the sign, then set it out

The opening sheet prints twelve problems such as 415 + 328 and 509 − 298 in boxes, with room to work underneath. Half add and half subtract, in no set order. Plus and minus mixed, 3-digit, written in a line fits twenty on a page for pupils who work in an exercise book.

Choose the regrouping

No regrouping, plus and minus, 3-digit keeps every column simple. Regrouping in every problem, plus and minus carries, or takes apart a ten or a hundred, each time. Common Core 2.NBT.7 starts this work in grade 2, and 3.NBT.2 asks grade 3 for fluency within 1,000.

  • Have pupils ring every minus sign before they start. On a mixed sheet the usual slip is the wrong operation.
  • Check a subtraction by adding: 211 + 298 should bring back 509.

Questions and answers

Are these addition and subtraction worksheets for grade 3?

Yes. Adding and subtracting within 1,000 is the grade 3 goal, and no sheet here leaves that range. Second graders who have met 3-digit numbers can begin with the sheet that has no regrouping.

Why are the mixed problems not printed in columns?

A sheet with both signs prints each problem in a line, with room under it. Pupils write the columns themselves, which is part of the skill. The last group under Sheet type has column sheets with one sign.

Does the answer key come with the sheet?

Yes. The key prints as the last page with every answer filled in. Untick Answer key before you press Print to leave it out.

Do any answers go below zero or past 1,000?

No. Every sum is 999 or less, and every subtraction takes a smaller number from a larger one.

All 13 sheet types

Both signs on one sheet 4

  • 3-digit with a 1-digit number, crossing a ten Mental steps across a ten in both directions: 645 + 5 = 650 and 664 − 6 = 658. Every problem changes the tens digit, so counting on or back by ones is not enough.
  • 3-digit with a 2-digit number, plus and minus One number is shorter than the other: 884 + 36 = 920 or 658 − 57 = 601. The slip to watch is lining the 2-digit number up on the left; its ones belong under the ones.
  • Plus and minus mixed, 3-digit, with room to work Twelve problems in boxes, half with each sign and in no set order: 415 + 328 = 743 beside 509 − 298 = 211. Pupils read the sign, set the numbers out in columns under the line of print, and work. Nothing passes 999.
  • Plus and minus mixed, 3-digit, written in a line The same mix as the opening sheet with twenty to a page and no boxes, for work on squared paper or in an exercise book: 223 + 153 = 376, 743 − 328 = 415. Half the problems subtract.
Show all 13 sheet types (9 more)

By regrouping 4

  • No regrouping, plus and minus, 3-digit Every column works on its own: 252 + 441 = 693 has no carry, and 782 − 561 = 221 needs nothing taken apart. A first mixed sheet, where the only new thing is reading the sign.
  • Regrouping in every problem, plus and minus Each addition carries at least once, as in 415 + 328 = 743, and each subtraction takes apart a ten or a hundred, as in 907 − 335 = 572. The sheet for a class that can already do both without regrouping.
  • Subtract across a zero, mixed with addition: 806 − 237 The top number of each subtraction has a zero inside, as in 806 − 237 = 569 or 700 − 102 = 598, so a hundred is taken apart before the tens can help. The additions on the sheet run the other way: 599 + 102 = 701.
  • Whole tens, plus and minus: 460 + 210, 650 − 230 Every number ends in zero, so pupils add or subtract tens and hundreds in their heads: 460 + 210 = 670 and 650 − 230 = 420. Twenty in a line, half with each sign.

Missing numbers, estimates and stories 3

  • Estimate first: round to the nearest 100, add or subtract Round both numbers, work out the estimate, then find the exact answer: 491 + 212 is about 500 + 200 = 700 and exactly 703; 713 − 329 is about 700 − 300 = 400 and exactly 384. Sums and differences take turns.
  • Missing number, either sign: ___ + 245 = 612 The blank is inside the problem: ___ + 245 = 612, 211 + ___ = 509, ___ − 328 = 415 or 376 − ___ = 223. Each is solved with the opposite operation, as in 612 − 245 = 367 and 415 + 328 = 743.
  • Word problems within 1,000: find the missing number Six stories with 3-digit numbers. Some ask for the total, 211 + 298 = 509. Others give the total and one part and ask for the other, which pupils find by subtracting: 376 − 223 = 153. The key shows the number sentence.

One sign, set out in columns 2

  • Addition only, in columns, sums within 1,000 One sign and the numbers already set out, nine large problems to a page: 346 + 228 = 574. For pupils who need the column layout printed before they meet a mixed sheet.
  • Subtraction only, in columns, 3-digit numbers Nine subtractions set out in columns, with and without regrouping: 974 − 324 = 650 needs none and 621 − 563 = 58 needs two. The key shows the top row crossed out and rewritten.

How this list was compiled: The sheet types and worked examples were written for this page; every problem is made by the sheet generator, each subtraction on a mixed sheet is an addition within 999 turned round, and every worked example was computed by script on 2026-10-01. The grades were read in the full text of the Common Core State Standards for Mathematics (California Department of Education copy, https://www.cde.ca.gov/be/st/ss/documents/ccssmathstandardaug2013.pdf), read on 2026-10-01: 2.NBT.7 has grade 2 add and subtract within 1,000 and says it is sometimes necessary to compose or decompose tens or hundreds, and 3.NBT.2 asks grade 3 to add and subtract within 1,000 fluently. Licence: own work

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