Let's get this math done. We have 579 and we're going to multiply it by 99. This is the same as taking 579 and adding it to itself 99 times.
Step 1: 0 + 579 = 579
Step 2: 579 + 579 = 1158
Step 3: 1158 + 579 = 1737
Step 4: 1737 + 579 = 2316
Step 5: 2316 + 579 = 2895
Step 6: 2895 + 579 = 3474
Step 7: 3474 + 579 = 4053
Step 8: 4053 + 579 = 4632
Step 9: 4632 + 579 = 5211
Step 10: 5211 + 579 = 5790
Step 11: 5790 + 579 = 6369
Step 12: 6369 + 579 = 6948
Step 13: 6948 + 579 = 7527
Step 14: 7527 + 579 = 8106
Step 15: 8106 + 579 = 8685
Step 16: 8685 + 579 = 9264
Step 17: 9264 + 579 = 9843
Step 18: 9843 + 579 = 10422
Step 19: 10422 + 579 = 11001
Step 20: 11001 + 579 = 11580
Step 21: 11580 + 579 = 12159
Step 22: 12159 + 579 = 12738
Step 23: 12738 + 579 = 13317
Step 24: 13317 + 579 = 13896
Step 25: 13896 + 579 = 14475
Step 26: 14475 + 579 = 15054
Step 27: 15054 + 579 = 15633
Step 28: 15633 + 579 = 16212
Step 29: 16212 + 579 = 16791
Step 30: 16791 + 579 = 17370
Step 31: 17370 + 579 = 17949
Step 32: 17949 + 579 = 18528
Step 33: 18528 + 579 = 19107
Step 34: 19107 + 579 = 19686
Step 35: 19686 + 579 = 20265
Step 36: 20265 + 579 = 20844
Step 37: 20844 + 579 = 21423
Step 38: 21423 + 579 = 22002
Step 39: 22002 + 579 = 22581
Step 40: 22581 + 579 = 23160
Step 41: 23160 + 579 = 23739
Step 42: 23739 + 579 = 24318
Step 43: 24318 + 579 = 24897
Step 44: 24897 + 579 = 25476
Step 45: 25476 + 579 = 26055
Step 46: 26055 + 579 = 26634
Step 47: 26634 + 579 = 27213
Step 48: 27213 + 579 = 27792
Step 49: 27792 + 579 = 28371
Step 50: 28371 + 579 = 28950
Step 51: 28950 + 579 = 29529
Step 52: 29529 + 579 = 30108
Step 53: 30108 + 579 = 30687
Step 54: 30687 + 579 = 31266
Step 55: 31266 + 579 = 31845
Step 56: 31845 + 579 = 32424
Step 57: 32424 + 579 = 33003
Step 58: 33003 + 579 = 33582
Step 59: 33582 + 579 = 34161
Step 60: 34161 + 579 = 34740
Step 61: 34740 + 579 = 35319
Step 62: 35319 + 579 = 35898
Step 63: 35898 + 579 = 36477
Step 64: 36477 + 579 = 37056
Step 65: 37056 + 579 = 37635
Step 66: 37635 + 579 = 38214
Step 67: 38214 + 579 = 38793
Step 68: 38793 + 579 = 39372
Step 69: 39372 + 579 = 39951
Step 70: 39951 + 579 = 40530
Step 71: 40530 + 579 = 41109
Step 72: 41109 + 579 = 41688
Step 73: 41688 + 579 = 42267
Step 74: 42267 + 579 = 42846
Step 75: 42846 + 579 = 43425
Step 76: 43425 + 579 = 44004
Step 77: 44004 + 579 = 44583
Step 78: 44583 + 579 = 45162
Step 79: 45162 + 579 = 45741
Step 80: 45741 + 579 = 46320
Step 81: 46320 + 579 = 46899
Step 82: 46899 + 579 = 47478
Step 83: 47478 + 579 = 48057
Step 84: 48057 + 579 = 48636
Step 85: 48636 + 579 = 49215
Step 86: 49215 + 579 = 49794
Step 87: 49794 + 579 = 50373
Step 88: 50373 + 579 = 50952
Step 89: 50952 + 579 = 51531
Step 90: 51531 + 579 = 52110
Step 91: 52110 + 579 = 52689
Step 92: 52689 + 579 = 53268
Step 93: 53268 + 579 = 53847
Step 94: 53847 + 579 = 54426
Step 95: 54426 + 579 = 55005
Step 96: 55005 + 579 = 55584
Step 97: 55584 + 579 = 56163
Step 98: 56163 + 579 = 56742
Step 99: 56742 + 579 = 57321

So, 579*99 = 57321