Let's get this math done. We have 913 and we're going to multiply it by 84. This is the same as taking 913 and adding it to itself 84 times.
Step 1: 0 + 913 = 913
Step 2: 913 + 913 = 1826
Step 3: 1826 + 913 = 2739
Step 4: 2739 + 913 = 3652
Step 5: 3652 + 913 = 4565
Step 6: 4565 + 913 = 5478
Step 7: 5478 + 913 = 6391
Step 8: 6391 + 913 = 7304
Step 9: 7304 + 913 = 8217
Step 10: 8217 + 913 = 9130
Step 11: 9130 + 913 = 10043
Step 12: 10043 + 913 = 10956
Step 13: 10956 + 913 = 11869
Step 14: 11869 + 913 = 12782
Step 15: 12782 + 913 = 13695
Step 16: 13695 + 913 = 14608
Step 17: 14608 + 913 = 15521
Step 18: 15521 + 913 = 16434
Step 19: 16434 + 913 = 17347
Step 20: 17347 + 913 = 18260
Step 21: 18260 + 913 = 19173
Step 22: 19173 + 913 = 20086
Step 23: 20086 + 913 = 20999
Step 24: 20999 + 913 = 21912
Step 25: 21912 + 913 = 22825
Step 26: 22825 + 913 = 23738
Step 27: 23738 + 913 = 24651
Step 28: 24651 + 913 = 25564
Step 29: 25564 + 913 = 26477
Step 30: 26477 + 913 = 27390
Step 31: 27390 + 913 = 28303
Step 32: 28303 + 913 = 29216
Step 33: 29216 + 913 = 30129
Step 34: 30129 + 913 = 31042
Step 35: 31042 + 913 = 31955
Step 36: 31955 + 913 = 32868
Step 37: 32868 + 913 = 33781
Step 38: 33781 + 913 = 34694
Step 39: 34694 + 913 = 35607
Step 40: 35607 + 913 = 36520
Step 41: 36520 + 913 = 37433
Step 42: 37433 + 913 = 38346
Step 43: 38346 + 913 = 39259
Step 44: 39259 + 913 = 40172
Step 45: 40172 + 913 = 41085
Step 46: 41085 + 913 = 41998
Step 47: 41998 + 913 = 42911
Step 48: 42911 + 913 = 43824
Step 49: 43824 + 913 = 44737
Step 50: 44737 + 913 = 45650
Step 51: 45650 + 913 = 46563
Step 52: 46563 + 913 = 47476
Step 53: 47476 + 913 = 48389
Step 54: 48389 + 913 = 49302
Step 55: 49302 + 913 = 50215
Step 56: 50215 + 913 = 51128
Step 57: 51128 + 913 = 52041
Step 58: 52041 + 913 = 52954
Step 59: 52954 + 913 = 53867
Step 60: 53867 + 913 = 54780
Step 61: 54780 + 913 = 55693
Step 62: 55693 + 913 = 56606
Step 63: 56606 + 913 = 57519
Step 64: 57519 + 913 = 58432
Step 65: 58432 + 913 = 59345
Step 66: 59345 + 913 = 60258
Step 67: 60258 + 913 = 61171
Step 68: 61171 + 913 = 62084
Step 69: 62084 + 913 = 62997
Step 70: 62997 + 913 = 63910
Step 71: 63910 + 913 = 64823
Step 72: 64823 + 913 = 65736
Step 73: 65736 + 913 = 66649
Step 74: 66649 + 913 = 67562
Step 75: 67562 + 913 = 68475
Step 76: 68475 + 913 = 69388
Step 77: 69388 + 913 = 70301
Step 78: 70301 + 913 = 71214
Step 79: 71214 + 913 = 72127
Step 80: 72127 + 913 = 73040
Step 81: 73040 + 913 = 73953
Step 82: 73953 + 913 = 74866
Step 83: 74866 + 913 = 75779
Step 84: 75779 + 913 = 76692

So, 913*84 = 76692