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3-Digit Addition

Name: ______________Date: ________Score: ____
1)
241
+ 40
2)
254
+ 51
3)
267
+ 62
4)
280
+ 73
5)
293
+ 84
6)
306
+ 95
7)
319
+ 106
8)
332
+ 117
9)
345
+ 128
10)
358
+ 139
11)
371
+ 150
12)
384
+ 161
13)
397
+ 172
14)
410
+ 183
15)
423
+ 194

mathprepai.com

2nd & 3rd Grade

3-Digit Addition

Add within 1,000 with regrouping across multiple places.

Grade
2nd & 3rd Grade
Common Core
3.NBT.A.2
Topic
Addition Worksheets
Format
PDF · A4 / Letter
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Sample problems

  1. 1.241 + 40
  2. 2.254 + 51
  3. 3.267 + 62
  4. 4.280 + 73
  5. 5.293 + 84
  6. 6.306 + 95
  7. 7.319 + 106
  8. 8.332 + 117
  9. 9.345 + 128
  10. 10.358 + 139
  11. 11.371 + 150
  12. 12.384 + 161
  13. 13.397 + 172
  14. 14.410 + 183
  15. 15.423 + 194
Answer key
  1. 1.281
  2. 2.305
  3. 3.329
  4. 4.353
  5. 5.377
  6. 6.401
  7. 7.425
  8. 8.449
  9. 9.473
  10. 10.497
  11. 11.521
  12. 12.545
  13. 13.569
  14. 14.593
  15. 15.617

About this 3-Digit Addition worksheet

This 3-digit addition worksheet is aimed at 2nd & 3rd Grade students and is generated by MathPrepAI's algorithmic engine — so you can produce unlimited fresh versions with automatic answer keys. Adjust the number of problems, difficulty, and page layout, then download a print-ready PDF. It aligns with Common Core standard 3.NBT.A.2.

Browse more by grade: Grade 2, Grade 3.

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