OK, let's crack this. We're given 397 and our task is to multiply it by 52. Essentially, we'll be adding 397 to itself 52 times.
Step 1: 0 + 397 = 397
Step 2: 397 + 397 = 794
Step 3: 794 + 397 = 1191
Step 4: 1191 + 397 = 1588
Step 5: 1588 + 397 = 1985
Step 6: 1985 + 397 = 2382
Step 7: 2382 + 397 = 2779
Step 8: 2779 + 397 = 3176
Step 9: 3176 + 397 = 3573
Step 10: 3573 + 397 = 3970
Step 11: 3970 + 397 = 4367
Step 12: 4367 + 397 = 4764
Step 13: 4764 + 397 = 5161
Step 14: 5161 + 397 = 5558
Step 15: 5558 + 397 = 5955
Step 16: 5955 + 397 = 6352
Step 17: 6352 + 397 = 6749
Step 18: 6749 + 397 = 7146
Step 19: 7146 + 397 = 7543
Step 20: 7543 + 397 = 7940
Step 21: 7940 + 397 = 8337
Step 22: 8337 + 397 = 8734
Step 23: 8734 + 397 = 9131
Step 24: 9131 + 397 = 9528
Step 25: 9528 + 397 = 9925
Step 26: 9925 + 397 = 10322
Step 27: 10322 + 397 = 10719
Step 28: 10719 + 397 = 11116
Step 29: 11116 + 397 = 11513
Step 30: 11513 + 397 = 11910
Step 31: 11910 + 397 = 12307
Step 32: 12307 + 397 = 12704
Step 33: 12704 + 397 = 13101
Step 34: 13101 + 397 = 13498
Step 35: 13498 + 397 = 13895
Step 36: 13895 + 397 = 14292
Step 37: 14292 + 397 = 14689
Step 38: 14689 + 397 = 15086
Step 39: 15086 + 397 = 15483
Step 40: 15483 + 397 = 15880
Step 41: 15880 + 397 = 16277
Step 42: 16277 + 397 = 16674
Step 43: 16674 + 397 = 17071
Step 44: 17071 + 397 = 17468
Step 45: 17468 + 397 = 17865
Step 46: 17865 + 397 = 18262
Step 47: 18262 + 397 = 18659
Step 48: 18659 + 397 = 19056
Step 49: 19056 + 397 = 19453
Step 50: 19453 + 397 = 19850
Step 51: 19850 + 397 = 20247
Step 52: 20247 + 397 = 20644

So, 397*52 = 20644