Math worksheet for practicing column addition with large numbers, featuring 9 problems with 7- and 8-digit numbers.

I'll solve each column addition problem step by step, carefully checking my calculations.

Problem 1:
```
7382924
+ 273895
+ 1038374
+ 3087475
---------
```

Let me add these:
- 7382924 + 273895 = 7656819
- 7656819 + 1038374 = 8695193
- 8695193 + 3087475 = 11782668

Problem 2:
```
6274841
+ 4037220
+ 837226
+ 792499
---------
```

- 6274841 + 4037220 = 10312061
- 10312061 + 837226 = 11149287
- 11149287 + 792499 = 11941786

Problem 3:
```
9308476
+ 738325
+ 2673806
+ 3083721
---------
```

- 9308476 + 738325 = 10046801
- 10046801 + 2673806 = 12720607
- 12720607 + 3083721 = 15804328

Problem 4:
```
6736278
+ 4382705
+ 1827646
+ 4937590
---------
```

- 6736278 + 4382705 = 11118983
- 11118983 + 1827646 = 12946629
- 12946629 + 4937590 = 17884219

Problem 5:
```
10927462
+ 2948311
+ 7083747
+ 20837420
----------
```

- 10927462 + 2948311 = 13875773
- 13875773 + 7083747 = 20959520
- 20959520 + 20837420 = 41796940

Problem 6:
```
40382874
+ 6373821
+ 9304737
+ 4738304
----------
```

- 40382874 + 6373821 = 46756695
- 46756695 + 9304737 = 56061432
- 56061432 + 4738304 = 60799736

Problem 7:
```
8372615
+ 1083743
+ 394985
+ 930871
+ 4371038
+ 810038
---------
```

- 8372615 + 1083743 = 9456358
- 9456358 + 394985 = 9851343
- 9851343 + 930871 = 10782214
- 10782214 + 4371038 = 15153252
- 15153252 + 810038 = 15963290

Problem 8:
```
1028463
+ 392847
+ 939281
+ 3928274
+ 7280042
+ 838737
----------
```

- 1028463 + 392847 = 1421310
- 1421310 + 939281 = 2360591
- 2360591 + 3928274 = 6288865
- 6288865 + 7280042 = 13568907
- 13568907 + 838737 = 14407644

Problem 9:
```
3827461
+ 1739485
+ 100382
+ 3837449
+ 637460
+ 3003824
---------
```

- 3827461 + 1739485 = 5566946
- 5566946 + 100382 = 5667328
- 5667328 + 3837449 = 9504777
- 9504777 + 637460 = 10142237
- 10142237 + 3003824 = 13146061

Final Answer:
1) 11,782,668
2) 11,941,786
3) 15,804,328
4) 17,884,219
5) 41,796,940
6) 60,799,736
7) 15,963,290
8) 14,407,644
9) 13,146,061