OK, let's crack this. We're given 7 and our task is to multiply it by 72. Essentially, we'll be adding 7 to itself 72 times.
Step 1: 0 + 7 = 7
Step 2: 7 + 7 = 14
Step 3: 14 + 7 = 21
Step 4: 21 + 7 = 28
Step 5: 28 + 7 = 35
Step 6: 35 + 7 = 42
Step 7: 42 + 7 = 49
Step 8: 49 + 7 = 56
Step 9: 56 + 7 = 63
Step 10: 63 + 7 = 70
Step 11: 70 + 7 = 77
Step 12: 77 + 7 = 84
Step 13: 84 + 7 = 91
Step 14: 91 + 7 = 98
Step 15: 98 + 7 = 105
Step 16: 105 + 7 = 112
Step 17: 112 + 7 = 119
Step 18: 119 + 7 = 126
Step 19: 126 + 7 = 133
Step 20: 133 + 7 = 140
Step 21: 140 + 7 = 147
Step 22: 147 + 7 = 154
Step 23: 154 + 7 = 161
Step 24: 161 + 7 = 168
Step 25: 168 + 7 = 175
Step 26: 175 + 7 = 182
Step 27: 182 + 7 = 189
Step 28: 189 + 7 = 196
Step 29: 196 + 7 = 203
Step 30: 203 + 7 = 210
Step 31: 210 + 7 = 217
Step 32: 217 + 7 = 224
Step 33: 224 + 7 = 231
Step 34: 231 + 7 = 238
Step 35: 238 + 7 = 245
Step 36: 245 + 7 = 252
Step 37: 252 + 7 = 259
Step 38: 259 + 7 = 266
Step 39: 266 + 7 = 273
Step 40: 273 + 7 = 280
Step 41: 280 + 7 = 287
Step 42: 287 + 7 = 294
Step 43: 294 + 7 = 301
Step 44: 301 + 7 = 308
Step 45: 308 + 7 = 315
Step 46: 315 + 7 = 322
Step 47: 322 + 7 = 329
Step 48: 329 + 7 = 336
Step 49: 336 + 7 = 343
Step 50: 343 + 7 = 350
Step 51: 350 + 7 = 357
Step 52: 357 + 7 = 364
Step 53: 364 + 7 = 371
Step 54: 371 + 7 = 378
Step 55: 378 + 7 = 385
Step 56: 385 + 7 = 392
Step 57: 392 + 7 = 399
Step 58: 399 + 7 = 406
Step 59: 406 + 7 = 413
Step 60: 413 + 7 = 420
Step 61: 420 + 7 = 427
Step 62: 427 + 7 = 434
Step 63: 434 + 7 = 441
Step 64: 441 + 7 = 448
Step 65: 448 + 7 = 455
Step 66: 455 + 7 = 462
Step 67: 462 + 7 = 469
Step 68: 469 + 7 = 476
Step 69: 476 + 7 = 483
Step 70: 483 + 7 = 490
Step 71: 490 + 7 = 497
Step 72: 497 + 7 = 504

So, 7*72 = 504