OK, let's work through this together. We're starting with 535 and we're going to multiply it by 72, which means we add 535 to itself 72 times.
Step 1: 0 + 535 = 535
Step 2: 535 + 535 = 1070
Step 3: 1070 + 535 = 1605
Step 4: 1605 + 535 = 2140
Step 5: 2140 + 535 = 2675
Step 6: 2675 + 535 = 3210
Step 7: 3210 + 535 = 3745
Step 8: 3745 + 535 = 4280
Step 9: 4280 + 535 = 4815
Step 10: 4815 + 535 = 5350
Step 11: 5350 + 535 = 5885
Step 12: 5885 + 535 = 6420
Step 13: 6420 + 535 = 6955
Step 14: 6955 + 535 = 7490
Step 15: 7490 + 535 = 8025
Step 16: 8025 + 535 = 8560
Step 17: 8560 + 535 = 9095
Step 18: 9095 + 535 = 9630
Step 19: 9630 + 535 = 10165
Step 20: 10165 + 535 = 10700
Step 21: 10700 + 535 = 11235
Step 22: 11235 + 535 = 11770
Step 23: 11770 + 535 = 12305
Step 24: 12305 + 535 = 12840
Step 25: 12840 + 535 = 13375
Step 26: 13375 + 535 = 13910
Step 27: 13910 + 535 = 14445
Step 28: 14445 + 535 = 14980
Step 29: 14980 + 535 = 15515
Step 30: 15515 + 535 = 16050
Step 31: 16050 + 535 = 16585
Step 32: 16585 + 535 = 17120
Step 33: 17120 + 535 = 17655
Step 34: 17655 + 535 = 18190
Step 35: 18190 + 535 = 18725
Step 36: 18725 + 535 = 19260
Step 37: 19260 + 535 = 19795
Step 38: 19795 + 535 = 20330
Step 39: 20330 + 535 = 20865
Step 40: 20865 + 535 = 21400
Step 41: 21400 + 535 = 21935
Step 42: 21935 + 535 = 22470
Step 43: 22470 + 535 = 23005
Step 44: 23005 + 535 = 23540
Step 45: 23540 + 535 = 24075
Step 46: 24075 + 535 = 24610
Step 47: 24610 + 535 = 25145
Step 48: 25145 + 535 = 25680
Step 49: 25680 + 535 = 26215
Step 50: 26215 + 535 = 26750
Step 51: 26750 + 535 = 27285
Step 52: 27285 + 535 = 27820
Step 53: 27820 + 535 = 28355
Step 54: 28355 + 535 = 28890
Step 55: 28890 + 535 = 29425
Step 56: 29425 + 535 = 29960
Step 57: 29960 + 535 = 30495
Step 58: 30495 + 535 = 31030
Step 59: 31030 + 535 = 31565
Step 60: 31565 + 535 = 32100
Step 61: 32100 + 535 = 32635
Step 62: 32635 + 535 = 33170
Step 63: 33170 + 535 = 33705
Step 64: 33705 + 535 = 34240
Step 65: 34240 + 535 = 34775
Step 66: 34775 + 535 = 35310
Step 67: 35310 + 535 = 35845
Step 68: 35845 + 535 = 36380
Step 69: 36380 + 535 = 36915
Step 70: 36915 + 535 = 37450
Step 71: 37450 + 535 = 37985
Step 72: 37985 + 535 = 38520

So, 535*72 = 38520