OK, let's crack this. We're given 393 and our task is to multiply it by 64. Essentially, we'll be adding 393 to itself 64 times.
Step 1: 0 + 393 = 393
Step 2: 393 + 393 = 786
Step 3: 786 + 393 = 1179
Step 4: 1179 + 393 = 1572
Step 5: 1572 + 393 = 1965
Step 6: 1965 + 393 = 2358
Step 7: 2358 + 393 = 2751
Step 8: 2751 + 393 = 3144
Step 9: 3144 + 393 = 3537
Step 10: 3537 + 393 = 3930
Step 11: 3930 + 393 = 4323
Step 12: 4323 + 393 = 4716
Step 13: 4716 + 393 = 5109
Step 14: 5109 + 393 = 5502
Step 15: 5502 + 393 = 5895
Step 16: 5895 + 393 = 6288
Step 17: 6288 + 393 = 6681
Step 18: 6681 + 393 = 7074
Step 19: 7074 + 393 = 7467
Step 20: 7467 + 393 = 7860
Step 21: 7860 + 393 = 8253
Step 22: 8253 + 393 = 8646
Step 23: 8646 + 393 = 9039
Step 24: 9039 + 393 = 9432
Step 25: 9432 + 393 = 9825
Step 26: 9825 + 393 = 10218
Step 27: 10218 + 393 = 10611
Step 28: 10611 + 393 = 11004
Step 29: 11004 + 393 = 11397
Step 30: 11397 + 393 = 11790
Step 31: 11790 + 393 = 12183
Step 32: 12183 + 393 = 12576
Step 33: 12576 + 393 = 12969
Step 34: 12969 + 393 = 13362
Step 35: 13362 + 393 = 13755
Step 36: 13755 + 393 = 14148
Step 37: 14148 + 393 = 14541
Step 38: 14541 + 393 = 14934
Step 39: 14934 + 393 = 15327
Step 40: 15327 + 393 = 15720
Step 41: 15720 + 393 = 16113
Step 42: 16113 + 393 = 16506
Step 43: 16506 + 393 = 16899
Step 44: 16899 + 393 = 17292
Step 45: 17292 + 393 = 17685
Step 46: 17685 + 393 = 18078
Step 47: 18078 + 393 = 18471
Step 48: 18471 + 393 = 18864
Step 49: 18864 + 393 = 19257
Step 50: 19257 + 393 = 19650
Step 51: 19650 + 393 = 20043
Step 52: 20043 + 393 = 20436
Step 53: 20436 + 393 = 20829
Step 54: 20829 + 393 = 21222
Step 55: 21222 + 393 = 21615
Step 56: 21615 + 393 = 22008
Step 57: 22008 + 393 = 22401
Step 58: 22401 + 393 = 22794
Step 59: 22794 + 393 = 23187
Step 60: 23187 + 393 = 23580
Step 61: 23580 + 393 = 23973
Step 62: 23973 + 393 = 24366
Step 63: 24366 + 393 = 24759
Step 64: 24759 + 393 = 25152

So, 393*64 = 25152