Let's get this math done. We have 729 and we're going to multiply it by 69. This is the same as taking 729 and adding it to itself 69 times.
Step 1: 0 + 729 = 729
Step 2: 729 + 729 = 1458
Step 3: 1458 + 729 = 2187
Step 4: 2187 + 729 = 2916
Step 5: 2916 + 729 = 3645
Step 6: 3645 + 729 = 4374
Step 7: 4374 + 729 = 5103
Step 8: 5103 + 729 = 5832
Step 9: 5832 + 729 = 6561
Step 10: 6561 + 729 = 7290
Step 11: 7290 + 729 = 8019
Step 12: 8019 + 729 = 8748
Step 13: 8748 + 729 = 9477
Step 14: 9477 + 729 = 10206
Step 15: 10206 + 729 = 10935
Step 16: 10935 + 729 = 11664
Step 17: 11664 + 729 = 12393
Step 18: 12393 + 729 = 13122
Step 19: 13122 + 729 = 13851
Step 20: 13851 + 729 = 14580
Step 21: 14580 + 729 = 15309
Step 22: 15309 + 729 = 16038
Step 23: 16038 + 729 = 16767
Step 24: 16767 + 729 = 17496
Step 25: 17496 + 729 = 18225
Step 26: 18225 + 729 = 18954
Step 27: 18954 + 729 = 19683
Step 28: 19683 + 729 = 20412
Step 29: 20412 + 729 = 21141
Step 30: 21141 + 729 = 21870
Step 31: 21870 + 729 = 22599
Step 32: 22599 + 729 = 23328
Step 33: 23328 + 729 = 24057
Step 34: 24057 + 729 = 24786
Step 35: 24786 + 729 = 25515
Step 36: 25515 + 729 = 26244
Step 37: 26244 + 729 = 26973
Step 38: 26973 + 729 = 27702
Step 39: 27702 + 729 = 28431
Step 40: 28431 + 729 = 29160
Step 41: 29160 + 729 = 29889
Step 42: 29889 + 729 = 30618
Step 43: 30618 + 729 = 31347
Step 44: 31347 + 729 = 32076
Step 45: 32076 + 729 = 32805
Step 46: 32805 + 729 = 33534
Step 47: 33534 + 729 = 34263
Step 48: 34263 + 729 = 34992
Step 49: 34992 + 729 = 35721
Step 50: 35721 + 729 = 36450
Step 51: 36450 + 729 = 37179
Step 52: 37179 + 729 = 37908
Step 53: 37908 + 729 = 38637
Step 54: 38637 + 729 = 39366
Step 55: 39366 + 729 = 40095
Step 56: 40095 + 729 = 40824
Step 57: 40824 + 729 = 41553
Step 58: 41553 + 729 = 42282
Step 59: 42282 + 729 = 43011
Step 60: 43011 + 729 = 43740
Step 61: 43740 + 729 = 44469
Step 62: 44469 + 729 = 45198
Step 63: 45198 + 729 = 45927
Step 64: 45927 + 729 = 46656
Step 65: 46656 + 729 = 47385
Step 66: 47385 + 729 = 48114
Step 67: 48114 + 729 = 48843
Step 68: 48843 + 729 = 49572
Step 69: 49572 + 729 = 50301

So, 729*69 = 50301