Let's get this math done. We have 7 and we're going to multiply it by 144. This is the same as taking 7 and adding it to itself 144 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
Step 73: 504 + 7 = 511
Step 74: 511 + 7 = 518
Step 75: 518 + 7 = 525
Step 76: 525 + 7 = 532
Step 77: 532 + 7 = 539
Step 78: 539 + 7 = 546
Step 79: 546 + 7 = 553
Step 80: 553 + 7 = 560
Step 81: 560 + 7 = 567
Step 82: 567 + 7 = 574
Step 83: 574 + 7 = 581
Step 84: 581 + 7 = 588
Step 85: 588 + 7 = 595
Step 86: 595 + 7 = 602
Step 87: 602 + 7 = 609
Step 88: 609 + 7 = 616
Step 89: 616 + 7 = 623
Step 90: 623 + 7 = 630
Step 91: 630 + 7 = 637
Step 92: 637 + 7 = 644
Step 93: 644 + 7 = 651
Step 94: 651 + 7 = 658
Step 95: 658 + 7 = 665
Step 96: 665 + 7 = 672
Step 97: 672 + 7 = 679
Step 98: 679 + 7 = 686
Step 99: 686 + 7 = 693
Step 100: 693 + 7 = 700
Step 101: 700 + 7 = 707
Step 102: 707 + 7 = 714
Step 103: 714 + 7 = 721
Step 104: 721 + 7 = 728
Step 105: 728 + 7 = 735
Step 106: 735 + 7 = 742
Step 107: 742 + 7 = 749
Step 108: 749 + 7 = 756
Step 109: 756 + 7 = 763
Step 110: 763 + 7 = 770
Step 111: 770 + 7 = 777
Step 112: 777 + 7 = 784
Step 113: 784 + 7 = 791
Step 114: 791 + 7 = 798
Step 115: 798 + 7 = 805
Step 116: 805 + 7 = 812
Step 117: 812 + 7 = 819
Step 118: 819 + 7 = 826
Step 119: 826 + 7 = 833
Step 120: 833 + 7 = 840
Step 121: 840 + 7 = 847
Step 122: 847 + 7 = 854
Step 123: 854 + 7 = 861
Step 124: 861 + 7 = 868
Step 125: 868 + 7 = 875
Step 126: 875 + 7 = 882
Step 127: 882 + 7 = 889
Step 128: 889 + 7 = 896
Step 129: 896 + 7 = 903
Step 130: 903 + 7 = 910
Step 131: 910 + 7 = 917
Step 132: 917 + 7 = 924
Step 133: 924 + 7 = 931
Step 134: 931 + 7 = 938
Step 135: 938 + 7 = 945
Step 136: 945 + 7 = 952
Step 137: 952 + 7 = 959
Step 138: 959 + 7 = 966
Step 139: 966 + 7 = 973
Step 140: 973 + 7 = 980
Step 141: 980 + 7 = 987
Step 142: 987 + 7 = 994
Step 143: 994 + 7 = 1001
Step 144: 1001 + 7 = 1008

So, 7*144 = 1008