Addition practice worksheet featuring 12 three-digit addition problems with space for answers, designed for math skill development.

Let me work through each addition problem carefully.

Column 1:
1. 704 + 865 = 1569
2. 724 + 301 + 612 = 1637
3. 356 + 522 + 609 = 1487
4. 326 + 421 + 563 = 1310
5. 326 + 657 + 789 + 114 = 1886

Column 2:
1. 894 + 434 = 1328
2. 473 + 142 + 84 = 699
3. 345 + 243 + 969 = 1557
4. 631 + 473 + 673 = 1777
5. 523 + 647 + 382 + 437 = 1989

Column 3:
1. 357 + 846 = 1203
2. 175 + 876 + 240 = 1291
3. 565 + 785 + 38 = 1388
4. 841 + 177 + 603 = 1621
5. 534 + 436 + 832 + 19 = 1821

Column 4:
1. 925 + 688 = 1613
2. 873 + 451 + 361 = 1685
3. 723 + 612 + 184 = 1519
4. 958 + 468 + 445 = 1871
5. 132 + 956 + 597 + 103 = 1788

Let me verify each calculation:

Column 1:
1. 704 + 865: 4+5=9, 0+6=6, 7+8=15 → 1569 ✓
2. 724 + 301 + 612: 724+301=1025, 1025+612=1637 ✓
3. 356 + 522 + 609: 356+522=878, 878+609=1487 ✓
4. 326 + 421 + 563: 326+421=747, 747+563=1310 ✓
5. 326 + 657 + 789 + 114: 326+657=983, 983+789=1772, 1772+114=1886 ✓

Column 2:
1. 894 + 434: 4+4=8, 9+3=12, 8+4+1=13 → 1328 ✓
2. 473 + 142 + 84: 473+142=615, 615+84=699 ✓
3. 345 + 243 + 969: 345+243=588, 588+969=1557 ✓
4. 631 + 473 + 673: 631+473=1104, 1104+673=1777 ✓
5. 523 + 647 + 382 + 437: 523+647=1170, 1170+382=1552, 1552+437=1989 ✓

Column 3:
1. 357 + 846: 7+6=13, 5+4+1=10, 3+8+1=12 → 1203 ✓
2. 175 + 876 + 240: 175+876=1051, 1051+240=1291 ✓
3. 565 + 785 + 38: 565+785=1350, 1350+38=1388 ✓
4. 841 + 177 + 603: 841+177=1018, 1018+603=1621 ✓
5. 534 + 436 + 832 + 19: 534+436=970, 970+832=1802, 1802+19=1821 ✓

Column 4:
1. 925 + 688: 5+8=13, 2+8+1=11, 9+6+1=16 → 1613 ✓
2. 873 + 451 + 361: 873+451=1324, 1324+361=1685 ✓
3. 723 + 612 + 184: 723+612=1335, 1335+184=1519 ✓
4. 958 + 468 + 445: 958+468=1426, 1426+445=1871 ✓
5. 132 + 956 + 597 + 103: 132+956=1088, 1088+597=1685, 1685+103=1788 ✓

All calculations verified. Now I'll present the final answer in a clear format.

Final Answer:

Column 1:
- 704 + 865 = 1,569
- 724 + 301 + 612 = 1,637
- 356 + 522 + 609 = 1,487
- 326 + 421 + 563 = 1,310
- 326 + 657 + 789 + 114 = 1,886

Column 2:
- 894 + 434 = 1,328
- 473 + 142 + 84 = 699
- 345 + 243 + 969 = 1,557
- 631 + 473 + 673 = 1,777
- 523 + 647 + 382 + 437 = 1,989

Column 3:
- 357 + 846 = 1,203
- 175 + 876 + 240 = 1,291
- 565 + 785 + 38 = 1,388
- 841 + 177 + 603 = 1,621
- 534 + 436 + 832 + 19 = 1,821

Column 4:
- 925 + 688 = 1,613
- 873 + 451 + 361 = 1,685
- 723 + 612 + 184 = 1,519
- 958 + 468 + 445 = 1,871
- 132 + 956 + 597 + 103 = 1,788