Without delay, let's solve this. We've got 143 and we will be multiplying it by 144, that is, adding 143 to itself 144 times.
Step 1: 0 + 143 = 143
Step 2: 143 + 143 = 286
Step 3: 286 + 143 = 429
Step 4: 429 + 143 = 572
Step 5: 572 + 143 = 715
Step 6: 715 + 143 = 858
Step 7: 858 + 143 = 1001
Step 8: 1001 + 143 = 1144
Step 9: 1144 + 143 = 1287
Step 10: 1287 + 143 = 1430
Step 11: 1430 + 143 = 1573
Step 12: 1573 + 143 = 1716
Step 13: 1716 + 143 = 1859
Step 14: 1859 + 143 = 2002
Step 15: 2002 + 143 = 2145
Step 16: 2145 + 143 = 2288
Step 17: 2288 + 143 = 2431
Step 18: 2431 + 143 = 2574
Step 19: 2574 + 143 = 2717
Step 20: 2717 + 143 = 2860
Step 21: 2860 + 143 = 3003
Step 22: 3003 + 143 = 3146
Step 23: 3146 + 143 = 3289
Step 24: 3289 + 143 = 3432
Step 25: 3432 + 143 = 3575
Step 26: 3575 + 143 = 3718
Step 27: 3718 + 143 = 3861
Step 28: 3861 + 143 = 4004
Step 29: 4004 + 143 = 4147
Step 30: 4147 + 143 = 4290
Step 31: 4290 + 143 = 4433
Step 32: 4433 + 143 = 4576
Step 33: 4576 + 143 = 4719
Step 34: 4719 + 143 = 4862
Step 35: 4862 + 143 = 5005
Step 36: 5005 + 143 = 5148
Step 37: 5148 + 143 = 5291
Step 38: 5291 + 143 = 5434
Step 39: 5434 + 143 = 5577
Step 40: 5577 + 143 = 5720
Step 41: 5720 + 143 = 5863
Step 42: 5863 + 143 = 6006
Step 43: 6006 + 143 = 6149
Step 44: 6149 + 143 = 6292
Step 45: 6292 + 143 = 6435
Step 46: 6435 + 143 = 6578
Step 47: 6578 + 143 = 6721
Step 48: 6721 + 143 = 6864
Step 49: 6864 + 143 = 7007
Step 50: 7007 + 143 = 7150
Step 51: 7150 + 143 = 7293
Step 52: 7293 + 143 = 7436
Step 53: 7436 + 143 = 7579
Step 54: 7579 + 143 = 7722
Step 55: 7722 + 143 = 7865
Step 56: 7865 + 143 = 8008
Step 57: 8008 + 143 = 8151
Step 58: 8151 + 143 = 8294
Step 59: 8294 + 143 = 8437
Step 60: 8437 + 143 = 8580
Step 61: 8580 + 143 = 8723
Step 62: 8723 + 143 = 8866
Step 63: 8866 + 143 = 9009
Step 64: 9009 + 143 = 9152
Step 65: 9152 + 143 = 9295
Step 66: 9295 + 143 = 9438
Step 67: 9438 + 143 = 9581
Step 68: 9581 + 143 = 9724
Step 69: 9724 + 143 = 9867
Step 70: 9867 + 143 = 10010
Step 71: 10010 + 143 = 10153
Step 72: 10153 + 143 = 10296
Step 73: 10296 + 143 = 10439
Step 74: 10439 + 143 = 10582
Step 75: 10582 + 143 = 10725
Step 76: 10725 + 143 = 10868
Step 77: 10868 + 143 = 11011
Step 78: 11011 + 143 = 11154
Step 79: 11154 + 143 = 11297
Step 80: 11297 + 143 = 11440
Step 81: 11440 + 143 = 11583
Step 82: 11583 + 143 = 11726
Step 83: 11726 + 143 = 11869
Step 84: 11869 + 143 = 12012
Step 85: 12012 + 143 = 12155
Step 86: 12155 + 143 = 12298
Step 87: 12298 + 143 = 12441
Step 88: 12441 + 143 = 12584
Step 89: 12584 + 143 = 12727
Step 90: 12727 + 143 = 12870
Step 91: 12870 + 143 = 13013
Step 92: 13013 + 143 = 13156
Step 93: 13156 + 143 = 13299
Step 94: 13299 + 143 = 13442
Step 95: 13442 + 143 = 13585
Step 96: 13585 + 143 = 13728
Step 97: 13728 + 143 = 13871
Step 98: 13871 + 143 = 14014
Step 99: 14014 + 143 = 14157
Step 100: 14157 + 143 = 14300
Step 101: 14300 + 143 = 14443
Step 102: 14443 + 143 = 14586
Step 103: 14586 + 143 = 14729
Step 104: 14729 + 143 = 14872
Step 105: 14872 + 143 = 15015
Step 106: 15015 + 143 = 15158
Step 107: 15158 + 143 = 15301
Step 108: 15301 + 143 = 15444
Step 109: 15444 + 143 = 15587
Step 110: 15587 + 143 = 15730
Step 111: 15730 + 143 = 15873
Step 112: 15873 + 143 = 16016
Step 113: 16016 + 143 = 16159
Step 114: 16159 + 143 = 16302
Step 115: 16302 + 143 = 16445
Step 116: 16445 + 143 = 16588
Step 117: 16588 + 143 = 16731
Step 118: 16731 + 143 = 16874
Step 119: 16874 + 143 = 17017
Step 120: 17017 + 143 = 17160
Step 121: 17160 + 143 = 17303
Step 122: 17303 + 143 = 17446
Step 123: 17446 + 143 = 17589
Step 124: 17589 + 143 = 17732
Step 125: 17732 + 143 = 17875
Step 126: 17875 + 143 = 18018
Step 127: 18018 + 143 = 18161
Step 128: 18161 + 143 = 18304
Step 129: 18304 + 143 = 18447
Step 130: 18447 + 143 = 18590
Step 131: 18590 + 143 = 18733
Step 132: 18733 + 143 = 18876
Step 133: 18876 + 143 = 19019
Step 134: 19019 + 143 = 19162
Step 135: 19162 + 143 = 19305
Step 136: 19305 + 143 = 19448
Step 137: 19448 + 143 = 19591
Step 138: 19591 + 143 = 19734
Step 139: 19734 + 143 = 19877
Step 140: 19877 + 143 = 20020
Step 141: 20020 + 143 = 20163
Step 142: 20163 + 143 = 20306
Step 143: 20306 + 143 = 20449
Step 144: 20449 + 143 = 20592

So, 143*144 = 20592