Solve the addition and subtraction problems in columns.

Mathematical Problems:

• 540 + 411 - 129 = 822
• 399 - 138 = 261
• 388 + 338 = 726
• 800 - 354 = 446
• 606 - 238 = 368
• 791 - 566 = 225
• 594 + 747 = 1341
• 831 - 453 = 378
• 813 - 427 = 386
• 900 - 123 = 777
• 400 - 111 = 289
• 297 + 386 = 683
• 905 - 556 = 349
• 284 + 759 = 1043
• 840 + 759 = 1599
• 314 + 286 = 600
• 289 + 747 = 1036
• 403 + 274 = 677
• 873 - 484 = 389
• 357 + 268 = 625
• 357 + 767 = 1124
• 313 + 478 = 791
• 454 + 379 = 833
• 600 + 757 = 1357
• 555 + 444 = 999
• 249 - 156 = 93
• 511 - 299 = 212
• 318 - 275 = 43
• 188 - 354 = -166
• 501 - 274 = 227
• 372 - 137 = 235
• 814 - 571 = 243
• 308 + 169 = 477
• 697 + 238 = 935