Alright, let's solve this math problem step by step. First, we have the number 81. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 108. So, we're going to take the number 81 and add it to itself 108 times.
Step 1: 0 + 81 = 81
Step 2: 81 + 81 = 162
Step 3: 162 + 81 = 243
Step 4: 243 + 81 = 324
Step 5: 324 + 81 = 405
Step 6: 405 + 81 = 486
Step 7: 486 + 81 = 567
Step 8: 567 + 81 = 648
Step 9: 648 + 81 = 729
Step 10: 729 + 81 = 810
Step 11: 810 + 81 = 891
Step 12: 891 + 81 = 972
Step 13: 972 + 81 = 1053
Step 14: 1053 + 81 = 1134
Step 15: 1134 + 81 = 1215
Step 16: 1215 + 81 = 1296
Step 17: 1296 + 81 = 1377
Step 18: 1377 + 81 = 1458
Step 19: 1458 + 81 = 1539
Step 20: 1539 + 81 = 1620
Step 21: 1620 + 81 = 1701
Step 22: 1701 + 81 = 1782
Step 23: 1782 + 81 = 1863
Step 24: 1863 + 81 = 1944
Step 25: 1944 + 81 = 2025
Step 26: 2025 + 81 = 2106
Step 27: 2106 + 81 = 2187
Step 28: 2187 + 81 = 2268
Step 29: 2268 + 81 = 2349
Step 30: 2349 + 81 = 2430
Step 31: 2430 + 81 = 2511
Step 32: 2511 + 81 = 2592
Step 33: 2592 + 81 = 2673
Step 34: 2673 + 81 = 2754
Step 35: 2754 + 81 = 2835
Step 36: 2835 + 81 = 2916
Step 37: 2916 + 81 = 2997
Step 38: 2997 + 81 = 3078
Step 39: 3078 + 81 = 3159
Step 40: 3159 + 81 = 3240
Step 41: 3240 + 81 = 3321
Step 42: 3321 + 81 = 3402
Step 43: 3402 + 81 = 3483
Step 44: 3483 + 81 = 3564
Step 45: 3564 + 81 = 3645
Step 46: 3645 + 81 = 3726
Step 47: 3726 + 81 = 3807
Step 48: 3807 + 81 = 3888
Step 49: 3888 + 81 = 3969
Step 50: 3969 + 81 = 4050
Step 51: 4050 + 81 = 4131
Step 52: 4131 + 81 = 4212
Step 53: 4212 + 81 = 4293
Step 54: 4293 + 81 = 4374
Step 55: 4374 + 81 = 4455
Step 56: 4455 + 81 = 4536
Step 57: 4536 + 81 = 4617
Step 58: 4617 + 81 = 4698
Step 59: 4698 + 81 = 4779
Step 60: 4779 + 81 = 4860
Step 61: 4860 + 81 = 4941
Step 62: 4941 + 81 = 5022
Step 63: 5022 + 81 = 5103
Step 64: 5103 + 81 = 5184
Step 65: 5184 + 81 = 5265
Step 66: 5265 + 81 = 5346
Step 67: 5346 + 81 = 5427
Step 68: 5427 + 81 = 5508
Step 69: 5508 + 81 = 5589
Step 70: 5589 + 81 = 5670
Step 71: 5670 + 81 = 5751
Step 72: 5751 + 81 = 5832
Step 73: 5832 + 81 = 5913
Step 74: 5913 + 81 = 5994
Step 75: 5994 + 81 = 6075
Step 76: 6075 + 81 = 6156
Step 77: 6156 + 81 = 6237
Step 78: 6237 + 81 = 6318
Step 79: 6318 + 81 = 6399
Step 80: 6399 + 81 = 6480
Step 81: 6480 + 81 = 6561
Step 82: 6561 + 81 = 6642
Step 83: 6642 + 81 = 6723
Step 84: 6723 + 81 = 6804
Step 85: 6804 + 81 = 6885
Step 86: 6885 + 81 = 6966
Step 87: 6966 + 81 = 7047
Step 88: 7047 + 81 = 7128
Step 89: 7128 + 81 = 7209
Step 90: 7209 + 81 = 7290
Step 91: 7290 + 81 = 7371
Step 92: 7371 + 81 = 7452
Step 93: 7452 + 81 = 7533
Step 94: 7533 + 81 = 7614
Step 95: 7614 + 81 = 7695
Step 96: 7695 + 81 = 7776
Step 97: 7776 + 81 = 7857
Step 98: 7857 + 81 = 7938
Step 99: 7938 + 81 = 8019
Step 100: 8019 + 81 = 8100
Step 101: 8100 + 81 = 8181
Step 102: 8181 + 81 = 8262
Step 103: 8262 + 81 = 8343
Step 104: 8343 + 81 = 8424
Step 105: 8424 + 81 = 8505
Step 106: 8505 + 81 = 8586
Step 107: 8586 + 81 = 8667
Step 108: 8667 + 81 = 8748

So, 81*108 = 8748