FreeMath
Grade 3medium

Grade 3 Addition Practice

Practice grade 3 addition with three-digit numbers. These problems build on second grade skills by introducing larger numbers and preparing for regrouping.

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All 20 Practice Problems

Every question in this set. Solve them on paper, or use the interactive tool above for instant feedback and hints.

  1. 1.234 + 145 = ?
  2. 2.356 + 223 = ?
  3. 3.467 + 312 = ?
  4. 4.528 + 251 = ?
  5. 5.645 + 134 = ?
  6. 6.127 + 352 = ?
  7. 7.238 + 441 = ?
  8. 8.349 + 230 = ?
  9. 9.451 + 328 = ?
  10. 10.562 + 217 = ?
  11. 11.183 + 406 = ?
  12. 12.274 + 315 = ?
  13. 13.385 + 214 = ?
  14. 14.496 + 203 = ?
  15. 15.517 + 362 = ?
  16. 16.628 + 251 = ?
  17. 17.739 + 140 = ?
  18. 18.154 + 425 = ?
  19. 19.265 + 314 = ?
  20. 20.376 + 423 = ?
Show answer key
  1. 1.234 + 145 = ? Answer: 379
  2. 2.356 + 223 = ? Answer: 579
  3. 3.467 + 312 = ? Answer: 779
  4. 4.528 + 251 = ? Answer: 779
  5. 5.645 + 134 = ? Answer: 779
  6. 6.127 + 352 = ? Answer: 479
  7. 7.238 + 441 = ? Answer: 679
  8. 8.349 + 230 = ? Answer: 579
  9. 9.451 + 328 = ? Answer: 779
  10. 10.562 + 217 = ? Answer: 779
  11. 11.183 + 406 = ? Answer: 589
  12. 12.274 + 315 = ? Answer: 589
  13. 13.385 + 214 = ? Answer: 599
  14. 14.496 + 203 = ? Answer: 699
  15. 15.517 + 362 = ? Answer: 879
  16. 16.628 + 251 = ? Answer: 879
  17. 17.739 + 140 = ? Answer: 879
  18. 18.154 + 425 = ? Answer: 579
  19. 19.265 + 314 = ? Answer: 579
  20. 20.376 + 423 = ? Answer: 799

About This Practice

This practice set includes 20 three-digit addition problems designed for third graders. Developing fluency with larger numbers is essential for multi-digit computation and estimation skills.

Want more practice? See all Grade 3 practice →