Use as first grid 8x8 the same 3x3 magic square and as second grid 3x3 the same 8x8 magic square to construct a composite 24x24 magic square.
Take a number from a cell of the first grid and add (number -/- 1) x 9 from the same cell of the second grid.
1x number
2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 |
7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 |
6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 |
2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 |
7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 |
6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 |
2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 |
7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 |
6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 |
2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 |
7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 |
6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 |
2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 |
7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 |
6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 |
2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 |
7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 |
6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 |
2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 |
7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 |
6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 |
2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 | 2 | 9 | 4 |
7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 | 7 | 5 | 3 |
6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 | 6 | 1 | 8 |
+ (number -/- 1) x 9
1 | 56 | 29 | 44 | 17 | 40 | 13 | 60 | 1 | 56 | 29 | 44 | 17 | 40 | 13 | 60 | 1 | 56 | 29 | 44 | 17 | 40 | 13 | 60 |
63 | 10 | 35 | 22 | 47 | 26 | 51 | 6 | 63 | 10 | 35 | 22 | 47 | 26 | 51 | 6 | 63 | 10 | 35 | 22 | 47 | 26 | 51 | 6 |
36 | 21 | 64 | 9 | 52 | 5 | 48 | 25 | 36 | 21 | 64 | 9 | 52 | 5 | 48 | 25 | 36 | 21 | 64 | 9 | 52 | 5 | 48 | 25 |
30 | 43 | 2 | 55 | 14 | 59 | 18 | 39 | 30 | 43 | 2 | 55 | 14 | 59 | 18 | 39 | 30 | 43 | 2 | 55 | 14 | 59 | 18 | 39 |
33 | 24 | 61 | 12 | 49 | 8 | 45 | 28 | 33 | 24 | 61 | 12 | 49 | 8 | 45 | 28 | 33 | 24 | 61 | 12 | 49 | 8 | 45 | 28 |
31 | 42 | 3 | 54 | 15 | 58 | 19 | 38 | 31 | 42 | 3 | 54 | 15 | 58 | 19 | 38 | 31 | 42 | 3 | 54 | 15 | 58 | 19 | 38 |
4 | 53 | 32 | 41 | 20 | 37 | 16 | 57 | 4 | 53 | 32 | 41 | 20 | 37 | 16 | 57 | 4 | 53 | 32 | 41 | 20 | 37 | 16 | 57 |
62 | 11 | 34 | 23 | 46 | 27 | 50 | 7 | 62 | 11 | 34 | 23 | 46 | 27 | 50 | 7 | 62 | 11 | 34 | 23 | 46 | 27 | 50 | 7 |
1 | 56 | 29 | 44 | 17 | 40 | 13 | 60 | 1 | 56 | 29 | 44 | 17 | 40 | 13 | 60 | 1 | 56 | 29 | 44 | 17 | 40 | 13 | 60 |
63 | 10 | 35 | 22 | 47 | 26 | 51 | 6 | 63 | 10 | 35 | 22 | 47 | 26 | 51 | 6 | 63 | 10 | 35 | 22 | 47 | 26 | 51 | 6 |
36 | 21 | 64 | 9 | 52 | 5 | 48 | 25 | 36 | 21 | 64 | 9 | 52 | 5 | 48 | 25 | 36 | 21 | 64 | 9 | 52 | 5 | 48 | 25 |
30 | 43 | 2 | 55 | 14 | 59 | 18 | 39 | 30 | 43 | 2 | 55 | 14 | 59 | 18 | 39 | 30 | 43 | 2 | 55 | 14 | 59 | 18 | 39 |
33 | 24 | 61 | 12 | 49 | 8 | 45 | 28 | 33 | 24 | 61 | 12 | 49 | 8 | 45 | 28 | 33 | 24 | 61 | 12 | 49 | 8 | 45 | 28 |
31 | 42 | 3 | 54 | 15 | 58 | 19 | 38 | 31 | 42 | 3 | 54 | 15 | 58 | 19 | 38 | 31 | 42 | 3 | 54 | 15 | 58 | 19 | 38 |
4 | 53 | 32 | 41 | 20 | 37 | 16 | 57 | 4 | 53 | 32 | 41 | 20 | 37 | 16 | 57 | 4 | 53 | 32 | 41 | 20 | 37 | 16 | 57 |
62 | 11 | 34 | 23 | 46 | 27 | 50 | 7 | 62 | 11 | 34 | 23 | 46 | 27 | 50 | 7 | 62 | 11 | 34 | 23 | 46 | 27 | 50 | 7 |
1 | 56 | 29 | 44 | 17 | 40 | 13 | 60 | 1 | 56 | 29 | 44 | 17 | 40 | 13 | 60 | 1 | 56 | 29 | 44 | 17 | 40 | 13 | 60 |
63 | 10 | 35 | 22 | 47 | 26 | 51 | 6 | 63 | 10 | 35 | 22 | 47 | 26 | 51 | 6 | 63 | 10 | 35 | 22 | 47 | 26 | 51 | 6 |
36 | 21 | 64 | 9 | 52 | 5 | 48 | 25 | 36 | 21 | 64 | 9 | 52 | 5 | 48 | 25 | 36 | 21 | 64 | 9 | 52 | 5 | 48 | 25 |
30 | 43 | 2 | 55 | 14 | 59 | 18 | 39 | 30 | 43 | 2 | 55 | 14 | 59 | 18 | 39 | 30 | 43 | 2 | 55 | 14 | 59 | 18 | 39 |
33 | 24 | 61 | 12 | 49 | 8 | 45 | 28 | 33 | 24 | 61 | 12 | 49 | 8 | 45 | 28 | 33 | 24 | 61 | 12 | 49 | 8 | 45 | 28 |
31 | 42 | 3 | 54 | 15 | 58 | 19 | 38 | 31 | 42 | 3 | 54 | 15 | 58 | 19 | 38 | 31 | 42 | 3 | 54 | 15 | 58 | 19 | 38 |
4 | 53 | 32 | 41 | 20 | 37 | 16 | 57 | 4 | 53 | 32 | 41 | 20 | 37 | 16 | 57 | 4 | 53 | 32 | 41 | 20 | 37 | 16 | 57 |
62 | 11 | 34 | 23 | 46 | 27 | 50 | 7 | 62 | 11 | 34 | 23 | 46 | 27 | 50 | 7 | 62 | 11 | 34 | 23 | 46 | 27 | 50 | 7 |
= Composite 24x24 magic square
2 | 504 | 256 | 389 | 153 | 355 | 110 | 540 | 4 | 497 | 261 | 391 | 146 | 360 | 112 | 533 | 9 | 499 | 254 | 396 | 148 | 353 | 117 | 535 |
565 | 86 | 309 | 196 | 419 | 228 | 457 | 50 | 561 | 88 | 311 | 192 | 421 | 230 | 453 | 52 | 563 | 84 | 313 | 194 | 417 | 232 | 455 | 48 |
321 | 181 | 575 | 78 | 460 | 44 | 429 | 217 | 323 | 186 | 568 | 80 | 465 | 37 | 431 | 222 | 316 | 188 | 573 | 73 | 467 | 42 | 424 | 224 |
263 | 387 | 13 | 488 | 126 | 526 | 155 | 351 | 265 | 380 | 18 | 490 | 119 | 531 | 157 | 344 | 270 | 382 | 11 | 495 | 121 | 524 | 162 | 346 |
295 | 212 | 543 | 106 | 437 | 66 | 403 | 248 | 291 | 214 | 545 | 102 | 439 | 68 | 399 | 250 | 293 | 210 | 547 | 104 | 435 | 70 | 401 | 246 |
276 | 370 | 26 | 483 | 127 | 521 | 168 | 334 | 278 | 375 | 19 | 485 | 132 | 514 | 170 | 339 | 271 | 377 | 24 | 478 | 134 | 519 | 163 | 341 |
29 | 477 | 283 | 362 | 180 | 328 | 137 | 513 | 31 | 470 | 288 | 364 | 173 | 333 | 139 | 506 | 36 | 472 | 281 | 369 | 175 | 326 | 144 | 508 |
556 | 95 | 300 | 205 | 410 | 237 | 448 | 59 | 552 | 97 | 302 | 201 | 412 | 239 | 444 | 61 | 554 | 93 | 304 | 203 | 408 | 241 | 446 | 57 |
6 | 496 | 260 | 393 | 145 | 359 | 114 | 532 | 8 | 501 | 253 | 395 | 150 | 352 | 116 | 537 | 1 | 503 | 258 | 388 | 152 | 357 | 109 | 539 |
560 | 90 | 310 | 191 | 423 | 229 | 452 | 54 | 562 | 83 | 315 | 193 | 416 | 234 | 454 | 47 | 567 | 85 | 308 | 198 | 418 | 227 | 459 | 49 |
322 | 185 | 570 | 79 | 464 | 39 | 430 | 221 | 318 | 187 | 572 | 75 | 466 | 41 | 426 | 223 | 320 | 183 | 574 | 77 | 462 | 43 | 428 | 219 |
267 | 379 | 17 | 492 | 118 | 530 | 159 | 343 | 269 | 384 | 10 | 494 | 123 | 523 | 161 | 348 | 262 | 386 | 15 | 487 | 125 | 528 | 154 | 350 |
290 | 216 | 544 | 101 | 441 | 67 | 398 | 252 | 292 | 209 | 549 | 103 | 434 | 72 | 400 | 245 | 297 | 211 | 542 | 108 | 436 | 65 | 405 | 247 |
277 | 374 | 21 | 484 | 131 | 516 | 169 | 338 | 273 | 376 | 23 | 480 | 133 | 518 | 165 | 340 | 275 | 372 | 25 | 482 | 129 | 520 | 167 | 336 |
33 | 469 | 287 | 366 | 172 | 332 | 141 | 505 | 35 | 474 | 280 | 368 | 177 | 325 | 143 | 510 | 28 | 476 | 285 | 361 | 179 | 330 | 136 | 512 |
551 | 99 | 301 | 200 | 414 | 238 | 443 | 63 | 553 | 92 | 306 | 202 | 407 | 243 | 445 | 56 | 558 | 94 | 299 | 207 | 409 | 236 | 450 | 58 |
7 | 500 | 255 | 394 | 149 | 354 | 115 | 536 | 3 | 502 | 257 | 390 | 151 | 356 | 111 | 538 | 5 | 498 | 259 | 392 | 147 | 358 | 113 | 534 |
564 | 82 | 314 | 195 | 415 | 233 | 456 | 46 | 566 | 87 | 307 | 197 | 420 | 226 | 458 | 51 | 559 | 89 | 312 | 190 | 422 | 231 | 451 | 53 |
317 | 189 | 571 | 74 | 468 | 40 | 425 | 225 | 319 | 182 | 576 | 76 | 461 | 45 | 427 | 218 | 324 | 184 | 569 | 81 | 463 | 38 | 432 | 220 |
268 | 383 | 12 | 493 | 122 | 525 | 160 | 347 | 264 | 385 | 14 | 489 | 124 | 527 | 156 | 349 | 266 | 381 | 16 | 491 | 120 | 529 | 158 | 345 |
294 | 208 | 548 | 105 | 433 | 71 | 402 | 244 | 296 | 213 | 541 | 107 | 438 | 64 | 404 | 249 | 289 | 215 | 546 | 100 | 440 | 69 | 397 | 251 |
272 | 378 | 22 | 479 | 135 | 517 | 164 | 342 | 274 | 371 | 27 | 481 | 128 | 522 | 166 | 335 | 279 | 373 | 20 | 486 | 130 | 515 | 171 | 337 |
34 | 473 | 282 | 367 | 176 | 327 | 142 | 509 | 30 | 475 | 284 | 363 | 178 | 329 | 138 | 511 | 32 | 471 | 286 | 365 | 174 | 331 | 140 | 507 |
555 | 91 | 305 | 204 | 406 | 242 | 447 | 55 | 557 | 96 | 298 | 206 | 411 | 235 | 449 | 60 | 550 | 98 | 303 | 199 | 413 | 240 | 442 | 62 |
N.B.: Each 3x8 or 8x3 rectangle inside the 24x24 magic square gives the magic sum of 6924.
I have used the method composite, AxB compact to construct
12x12, 15x15, 20x20, 21x21, 24x24, 28x28, 30x30a and 30x30b