Comprehensive math worksheet designed to help students practice adding multiple 3-digit numbers in columns.

Let’s solve each addition problem step by step. We’ll add the numbers column by column, starting from the right (ones place), then tens, then hundreds — and carry over if needed.

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First Row:

1. 704 + 865
Ones: 4 + 5 = 9
Tens: 0 + 6 = 6
Hundreds: 7 + 8 = 15 → write 5, carry 1 to thousands
Thousands: 1 (carried) → so total is 1569

2. 894 + 434
Ones: 4 + 4 = 8
Tens: 9 + 3 = 12 → write 2, carry 1
Hundreds: 8 + 4 + 1 (carry) = 13 → write 3, carry 1
Thousands: 1 → 1328

3. 357 + 846
Ones: 7 + 6 = 13 → write 3, carry 1
Tens: 5 + 4 + 1 = 10 → write 0, carry 1
Hundreds: 3 + 8 + 1 = 12 → write 2, carry 1
Thousands: 1 → 1203

4. 925 + 688
Ones: 5 + 8 = 13 → write 3, carry 1
Tens: 2 + 8 + 1 = 11 → write 1, carry 1
Hundreds: 9 + 6 + 1 = 16 → write 6, carry 1
Thousands: 1 → 1613

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Second Row:

5. 724 + 301 + 612
Let’s add two at a time:
724 + 301 = 1025
1025 + 612 =
Ones: 5 + 2 = 7
Tens: 2 + 1 = 3
Hundreds: 0 + 6 = 6
Thousands: 1 → 1637

6. 473 + 142 + 84
First: 473 + 142 = 615
Then: 615 + 84 =
Ones: 5 + 4 = 9
Tens: 1 + 8 = 9
Hundreds: 6 → 699

7. 175 + 876 + 240
175 + 876 = 1051
1051 + 240 =
Ones: 1 + 0 = 1
Tens: 5 + 4 = 9
Hundreds: 0 + 2 = 2
Thousands: 1 → 1291

8. 873 + 451 + 361
873 + 451 = 1324
1324 + 361 =
Ones: 4 + 1 = 5
Tens: 2 + 6 = 8
Hundreds: 3 + 3 = 6
Thousands: 1 → 1685

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Third Row:

9. 356 + 522 + 609
356 + 522 = 878
878 + 609 =
Ones: 8 + 9 = 17 → write 7, carry 1
Tens: 7 + 0 + 1 = 8
Hundreds: 8 + 6 = 14 → write 4, carry 1
Thousands: 1 → 1487

10. 345 + 243 + 969
345 + 243 = 588
588 + 969 =
Ones: 8 + 9 = 17 → write 7, carry 1
Tens: 8 + 6 + 1 = 15 → write 5, carry 1
Hundreds: 5 + 9 + 1 = 15 → write 5, carry 1
Thousands: 1 → 1557

11. 565 + 785 + 38
565 + 785 = 1350
1350 + 38 =
Ones: 0 + 8 = 8
Tens: 5 + 3 = 8
Hundreds: 3
Thousands: 1 → 1388

12. 723 + 612 + 184
723 + 612 = 1335
1335 + 184 =
Ones: 5 + 4 = 9
Tens: 3 + 8 = 11 → write 1, carry 1
Hundreds: 3 + 1 + 1 = 5
Thousands: 1 → 1519

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Fourth Row:

13. 326 + 421 + 563
326 + 421 = 747
747 + 563 =
Ones: 7 + 3 = 10 → write 0, carry 1
Tens: 4 + 6 + 1 = 11 → write 1, carry 1
Hundreds: 7 + 5 + 1 = 13 → write 3, carry 1
Thousands: 1 → 1310

14. 631 + 473 + 673
631 + 473 = 1104
1104 + 673 =
Ones: 4 + 3 = 7
Tens: 0 + 7 = 7
Hundreds: 1 + 6 = 7
Thousands: 1 → 1777

15. 841 + 177 + 603
841 + 177 = 1018
1018 + 603 =
Ones: 8 + 3 = 11 → write 1, carry 1
Tens: 1 + 0 + 1 = 2
Hundreds: 0 + 6 = 6
Thousands: 1 → 1621

16. 958 + 468 + 445
958 + 468 = 1426
1426 + 445 =
Ones: 6 + 5 = 11 → write 1, carry 1
Tens: 2 + 4 + 1 = 7
Hundreds: 4 + 4 = 8
Thousands: 1 → 1871

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Fifth Row:

17. 326 + 657 + 789 + 114
Step-by-step:
326 + 657 = 983
983 + 789 = 1772
1772 + 114 =
Ones: 2 + 4 = 6
Tens: 7 + 1 = 8
Hundreds: 7 + 1 = 8
Thousands: 1 → 1886

18. 523 + 647 + 382 + 437
523 + 647 = 1170
1170 + 382 = 1552
1552 + 437 =
Ones: 2 + 7 = 9
Tens: 5 + 3 = 8
Hundreds: 5 + 4 = 9
Thousands: 1 → 1989

19. 534 + 436 + 832 + 19
534 + 436 = 970
970 + 832 = 1802
1802 + 19 =
Ones: 2 + 9 = 11 → write 1, carry 1
Tens: 0 + 1 + 1 = 2
Hundreds: 8
Thousands: 1 → 1821

20. 132 + 956 + 597 + 103
132 + 956 = 1088
1088 + 597 = 1685
1685 + 103 =
Ones: 5 + 3 = 8
Tens: 8 + 0 = 8
Hundreds: 6 + 1 = 7
Thousands: 1 → 1788

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Final Answer:

Row 1:
1569, 1328, 1203, 1613

Row 2:
1637, 699, 1291, 1685

Row 3:
1487, 1557, 1388, 1519

Row 4:
1310, 1777, 1621, 1871

Row 5:
1886, 1989, 1821, 1788