Name
Date

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

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

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.

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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