Alright, let's solve this math problem step by step. First, we have the number 143. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 81. So, we're going to take the number 143 and add it to itself 81 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

So, 143*81 = 11583