Let's get this math done. We have 766 and we're going to multiply it by 89. This is the same as taking 766 and adding it to itself 89 times.
Step 1: 0 + 766 = 766
Step 2: 766 + 766 = 1532
Step 3: 1532 + 766 = 2298
Step 4: 2298 + 766 = 3064
Step 5: 3064 + 766 = 3830
Step 6: 3830 + 766 = 4596
Step 7: 4596 + 766 = 5362
Step 8: 5362 + 766 = 6128
Step 9: 6128 + 766 = 6894
Step 10: 6894 + 766 = 7660
Step 11: 7660 + 766 = 8426
Step 12: 8426 + 766 = 9192
Step 13: 9192 + 766 = 9958
Step 14: 9958 + 766 = 10724
Step 15: 10724 + 766 = 11490
Step 16: 11490 + 766 = 12256
Step 17: 12256 + 766 = 13022
Step 18: 13022 + 766 = 13788
Step 19: 13788 + 766 = 14554
Step 20: 14554 + 766 = 15320
Step 21: 15320 + 766 = 16086
Step 22: 16086 + 766 = 16852
Step 23: 16852 + 766 = 17618
Step 24: 17618 + 766 = 18384
Step 25: 18384 + 766 = 19150
Step 26: 19150 + 766 = 19916
Step 27: 19916 + 766 = 20682
Step 28: 20682 + 766 = 21448
Step 29: 21448 + 766 = 22214
Step 30: 22214 + 766 = 22980
Step 31: 22980 + 766 = 23746
Step 32: 23746 + 766 = 24512
Step 33: 24512 + 766 = 25278
Step 34: 25278 + 766 = 26044
Step 35: 26044 + 766 = 26810
Step 36: 26810 + 766 = 27576
Step 37: 27576 + 766 = 28342
Step 38: 28342 + 766 = 29108
Step 39: 29108 + 766 = 29874
Step 40: 29874 + 766 = 30640
Step 41: 30640 + 766 = 31406
Step 42: 31406 + 766 = 32172
Step 43: 32172 + 766 = 32938
Step 44: 32938 + 766 = 33704
Step 45: 33704 + 766 = 34470
Step 46: 34470 + 766 = 35236
Step 47: 35236 + 766 = 36002
Step 48: 36002 + 766 = 36768
Step 49: 36768 + 766 = 37534
Step 50: 37534 + 766 = 38300
Step 51: 38300 + 766 = 39066
Step 52: 39066 + 766 = 39832
Step 53: 39832 + 766 = 40598
Step 54: 40598 + 766 = 41364
Step 55: 41364 + 766 = 42130
Step 56: 42130 + 766 = 42896
Step 57: 42896 + 766 = 43662
Step 58: 43662 + 766 = 44428
Step 59: 44428 + 766 = 45194
Step 60: 45194 + 766 = 45960
Step 61: 45960 + 766 = 46726
Step 62: 46726 + 766 = 47492
Step 63: 47492 + 766 = 48258
Step 64: 48258 + 766 = 49024
Step 65: 49024 + 766 = 49790
Step 66: 49790 + 766 = 50556
Step 67: 50556 + 766 = 51322
Step 68: 51322 + 766 = 52088
Step 69: 52088 + 766 = 52854
Step 70: 52854 + 766 = 53620
Step 71: 53620 + 766 = 54386
Step 72: 54386 + 766 = 55152
Step 73: 55152 + 766 = 55918
Step 74: 55918 + 766 = 56684
Step 75: 56684 + 766 = 57450
Step 76: 57450 + 766 = 58216
Step 77: 58216 + 766 = 58982
Step 78: 58982 + 766 = 59748
Step 79: 59748 + 766 = 60514
Step 80: 60514 + 766 = 61280
Step 81: 61280 + 766 = 62046
Step 82: 62046 + 766 = 62812
Step 83: 62812 + 766 = 63578
Step 84: 63578 + 766 = 64344
Step 85: 64344 + 766 = 65110
Step 86: 65110 + 766 = 65876
Step 87: 65876 + 766 = 66642
Step 88: 66642 + 766 = 67408
Step 89: 67408 + 766 = 68174

So, 766*89 = 68174