OK, let's crack this. We're given 235 and our task is to multiply it by 72. Essentially, we'll be adding 235 to itself 72 times.
Step 1: 0 + 235 = 235
Step 2: 235 + 235 = 470
Step 3: 470 + 235 = 705
Step 4: 705 + 235 = 940
Step 5: 940 + 235 = 1175
Step 6: 1175 + 235 = 1410
Step 7: 1410 + 235 = 1645
Step 8: 1645 + 235 = 1880
Step 9: 1880 + 235 = 2115
Step 10: 2115 + 235 = 2350
Step 11: 2350 + 235 = 2585
Step 12: 2585 + 235 = 2820
Step 13: 2820 + 235 = 3055
Step 14: 3055 + 235 = 3290
Step 15: 3290 + 235 = 3525
Step 16: 3525 + 235 = 3760
Step 17: 3760 + 235 = 3995
Step 18: 3995 + 235 = 4230
Step 19: 4230 + 235 = 4465
Step 20: 4465 + 235 = 4700
Step 21: 4700 + 235 = 4935
Step 22: 4935 + 235 = 5170
Step 23: 5170 + 235 = 5405
Step 24: 5405 + 235 = 5640
Step 25: 5640 + 235 = 5875
Step 26: 5875 + 235 = 6110
Step 27: 6110 + 235 = 6345
Step 28: 6345 + 235 = 6580
Step 29: 6580 + 235 = 6815
Step 30: 6815 + 235 = 7050
Step 31: 7050 + 235 = 7285
Step 32: 7285 + 235 = 7520
Step 33: 7520 + 235 = 7755
Step 34: 7755 + 235 = 7990
Step 35: 7990 + 235 = 8225
Step 36: 8225 + 235 = 8460
Step 37: 8460 + 235 = 8695
Step 38: 8695 + 235 = 8930
Step 39: 8930 + 235 = 9165
Step 40: 9165 + 235 = 9400
Step 41: 9400 + 235 = 9635
Step 42: 9635 + 235 = 9870
Step 43: 9870 + 235 = 10105
Step 44: 10105 + 235 = 10340
Step 45: 10340 + 235 = 10575
Step 46: 10575 + 235 = 10810
Step 47: 10810 + 235 = 11045
Step 48: 11045 + 235 = 11280
Step 49: 11280 + 235 = 11515
Step 50: 11515 + 235 = 11750
Step 51: 11750 + 235 = 11985
Step 52: 11985 + 235 = 12220
Step 53: 12220 + 235 = 12455
Step 54: 12455 + 235 = 12690
Step 55: 12690 + 235 = 12925
Step 56: 12925 + 235 = 13160
Step 57: 13160 + 235 = 13395
Step 58: 13395 + 235 = 13630
Step 59: 13630 + 235 = 13865
Step 60: 13865 + 235 = 14100
Step 61: 14100 + 235 = 14335
Step 62: 14335 + 235 = 14570
Step 63: 14570 + 235 = 14805
Step 64: 14805 + 235 = 15040
Step 65: 15040 + 235 = 15275
Step 66: 15275 + 235 = 15510
Step 67: 15510 + 235 = 15745
Step 68: 15745 + 235 = 15980
Step 69: 15980 + 235 = 16215
Step 70: 16215 + 235 = 16450
Step 71: 16450 + 235 = 16685
Step 72: 16685 + 235 = 16920

So, 235*72 = 16920