3-digit addition worksheets

  • Level: Grade 2 – Grade 3
  • Free
  • Printable
  • Answer key included

Three-digit addition combines everything students know about place value: ones, tens and hundreds. These sheets mix problems that need regrouping in zero, one or several columns, which mirrors real practice better than drilling a single case.

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3-digit addition worksheets
Name: Date: Score: / 25

Add.

  1. 1.
    581+644 
  2. 2.
    756+284 
  3. 3.
    287+636 
  4. 4.
    488+692 
  5. 5.
    382+859 
  6. 6.
    178+909 
  7. 7.
    414+391 
  8. 8.
    830+631 
  9. 9.
    851+600 
  10. 10.
    333+548 
  11. 11.
    442+155 
  12. 12.
    245+330 
  13. 13.
    246+986 
  14. 14.
    240+920 
  15. 15.
    635+454 
  16. 16.
    610+326 
  17. 17.
    345+618 
  18. 18.
    246+536 
  19. 19.
    262+482 
  20. 20.
    797+250 
  21. 21.
    231+726 
  22. 22.
    185+619 
  23. 23.
    733+423 
  24. 24.
    416+663 
  25. 25.
    230+665 
MathSheetLabWorksheet #127166
3-digit addition worksheets Answer key
  1. 1.
    581+6441225
  2. 2.
    756+2841040
  3. 3.
    287+636923
  4. 4.
    488+6921180
  5. 5.
    382+8591241
  6. 6.
    178+9091087
  7. 7.
    414+391805
  8. 8.
    830+6311461
  9. 9.
    851+6001451
  10. 10.
    333+548881
  11. 11.
    442+155597
  12. 12.
    245+330575
  13. 13.
    246+9861232
  14. 14.
    240+9201160
  15. 15.
    635+4541089
  16. 16.
    610+326936
  17. 17.
    345+618963
  18. 18.
    246+536782
  19. 19.
    262+482744
  20. 20.
    797+2501047
  21. 21.
    231+726957
  22. 22.
    185+619804
  23. 23.
    733+4231156
  24. 24.
    416+6631079
  25. 25.
    230+665895
MathSheetLabWorksheet #127166

About this worksheet

Each sheet contains 20, 25 or 30 problems (your choice) and is generated at random. Press “New problems” as many times as you like; there is no limit and no account needed.

Worked example

720+787 
  1. Ones: 0 + 7 = 7. Write 7.
  2. Tens: 2 + 8 = 10. Write 0 and carry 1 to the hundreds.
  3. Hundreds: 7 + 7 + 1 = 15 (including the carried 1). Write 15.

Answer: 1507

Teaching tips

  • Have students say the carried digit out loud ("7 plus 5 is 12, write 2, carry 1") until it becomes automatic.
  • Estimate first by rounding to the nearest hundred, then check that the answer is close.

How to print or save as PDF

  1. Choose the options on the left (on a phone, above the preview).
  2. Press Print / Save as PDF.
  3. In the print window, pick your printer, or choose “Save as PDF” as the destination.

Only the worksheet and its answer key are printed; menus and buttons are hidden automatically.

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