OK, let's work through this together. We're starting with 252 and we're going to multiply it by 53, which means we add 252 to itself 53 times.
Step 1: 0 + 252 = 252
Step 2: 252 + 252 = 504
Step 3: 504 + 252 = 756
Step 4: 756 + 252 = 1008
Step 5: 1008 + 252 = 1260
Step 6: 1260 + 252 = 1512
Step 7: 1512 + 252 = 1764
Step 8: 1764 + 252 = 2016
Step 9: 2016 + 252 = 2268
Step 10: 2268 + 252 = 2520
Step 11: 2520 + 252 = 2772
Step 12: 2772 + 252 = 3024
Step 13: 3024 + 252 = 3276
Step 14: 3276 + 252 = 3528
Step 15: 3528 + 252 = 3780
Step 16: 3780 + 252 = 4032
Step 17: 4032 + 252 = 4284
Step 18: 4284 + 252 = 4536
Step 19: 4536 + 252 = 4788
Step 20: 4788 + 252 = 5040
Step 21: 5040 + 252 = 5292
Step 22: 5292 + 252 = 5544
Step 23: 5544 + 252 = 5796
Step 24: 5796 + 252 = 6048
Step 25: 6048 + 252 = 6300
Step 26: 6300 + 252 = 6552
Step 27: 6552 + 252 = 6804
Step 28: 6804 + 252 = 7056
Step 29: 7056 + 252 = 7308
Step 30: 7308 + 252 = 7560
Step 31: 7560 + 252 = 7812
Step 32: 7812 + 252 = 8064
Step 33: 8064 + 252 = 8316
Step 34: 8316 + 252 = 8568
Step 35: 8568 + 252 = 8820
Step 36: 8820 + 252 = 9072
Step 37: 9072 + 252 = 9324
Step 38: 9324 + 252 = 9576
Step 39: 9576 + 252 = 9828
Step 40: 9828 + 252 = 10080
Step 41: 10080 + 252 = 10332
Step 42: 10332 + 252 = 10584
Step 43: 10584 + 252 = 10836
Step 44: 10836 + 252 = 11088
Step 45: 11088 + 252 = 11340
Step 46: 11340 + 252 = 11592
Step 47: 11592 + 252 = 11844
Step 48: 11844 + 252 = 12096
Step 49: 12096 + 252 = 12348
Step 50: 12348 + 252 = 12600
Step 51: 12600 + 252 = 12852
Step 52: 12852 + 252 = 13104
Step 53: 13104 + 252 = 13356

So, 252*53 = 13356