3-Digit Numbers Addition with Regrouping

Name Grade School
Date Questions20 Score

  1. example258
     194
    452
  2. 1719
     128
     
  3. 2219
     251
     
  4. 3155
     562
     
  5. 4724
     864
     
  6. 5790
     341
     
  7. 6675
     292
     
  8. 7514
     267
     
  9. 8674
     981
     
  10. 9372
     348
     
  11. 10499
     836
     
  12. 11609
     139
     
  13. 12565
     896
     
  14. 13990
     933
     
  15. 14884
     709
     
  16. 15488
     864
     
  17. 16878
     569
     
  18. 17872
     300
     
  19. 18170
     873
     
  20. 19736
     249
     
  21. 20900
     230
     

Answers Key
  1. 1719
     128
    847
  2. 2219
     251
    470
  3. 3155
     562
    717
  4. 4724
     864
    1588
  5. 5790
     341
    1131
  6. 6675
     292
    967
  7. 7514
     267
    781
  8. 8674
     981
    1655
  9. 9372
     348
    720
  10. 10499
     836
    1335
  11. 11609
     139
    748
  12. 12565
     896
    1461
  13. 13990
     933
    1923
  14. 14884
     709
    1593
  15. 15488
     864
    1352
  16. 16878
     569
    1447
  17. 17872
     300
    1172
  18. 18170
     873
    1043
  19. 19736
     249
    985
  20. 20900
     230
    1130

Worksheet for Adding 3-Digit Numbers with Regrouping

3-digit numbers addition with regrouping worksheet with answers to practice & learn 3rd grade math problems on addition is available online for free in printable & downloadable (pdf & image) format. Tap on PRINT, PDF or IMAGE button to print or download this grade-3 worksheet for adding two 3-digit numbers with overflow.

How to Use this Worksheet

In this third grade math worksheet, there are 15 questions on 3-digit numbers addition (regrouping) with 1 solved example. Each question contains two 3-digit numbers with empty space for the sum. Students are required to write the sum of corresponding place values of two three digit numbers together as like in the given solved example of this online workbook.

Regrouping
If the sum of Ones place values exceeds more than 9 or is a 2 digit number, the One’s place value of sum must be written underneath to the Ones place values of addends and the Ten’s place value of sum must be added to the sum of addends of Tens place values. Similarly, if the sum of Tens place values exceeds more than 9 or is a 2 digit number, the One’s place value of sum must be written underneath to the Tens place values of addends and the Tens place value of sum must be added to the sum of addends of Hundreds place values. If there is no adjacent place values, the two digit number should be written underneath to the corresponding place values.

For example, lets assume 456 and 789 are the two given 3-digit numbers. Being addition, the same place values of 2 3-digit numbers should be added together. From right to left, the same place valued digits 6 and 9, 5 and 8 & 4 and 7 should be added together and the answer should be written underneath to the corresponding place values. The sum of 6 and 9 is 15, since write the 5 underneath to the One’s place value and the remaining digit 1 of 15 (Ten’s place of 15) should be added to the sum of left adjacent place value. Therefore, the left adjacent sum becomes 5 + 8 + 1 = 14. For 14, the One’s place value 4 should be written underneath to the Ten’s place value of the addition and the remaining 1 of 14 should be added to left adjacent place values of addition. Therefore, the left adjacent sum becomes 4 + 7 + 1 = 12. Being 3-digit numbers addition, there is no further adjacent place values, since append the 12 on the left hand side to previous result 45. Hence, the sum of 456 and 789 is 1245.

Answers Key

Teachers, parents or students can check or validate the completed math workbook containing the set of 3rd grade math questions for adding two 3-digit numbers with regrouping by using the corresponding answers key.

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