OK, let's crack this. We're given 723 and our task is to multiply it by 236. Essentially, we'll be adding 723 to itself 236 times.
Step 1: 0 + 723 = 723
Step 2: 723 + 723 = 1446
Step 3: 1446 + 723 = 2169
Step 4: 2169 + 723 = 2892
Step 5: 2892 + 723 = 3615
Step 6: 3615 + 723 = 4338
Step 7: 4338 + 723 = 5061
Step 8: 5061 + 723 = 5784
Step 9: 5784 + 723 = 6507
Step 10: 6507 + 723 = 7230
Step 11: 7230 + 723 = 7953
Step 12: 7953 + 723 = 8676
Step 13: 8676 + 723 = 9399
Step 14: 9399 + 723 = 10122
Step 15: 10122 + 723 = 10845
Step 16: 10845 + 723 = 11568
Step 17: 11568 + 723 = 12291
Step 18: 12291 + 723 = 13014
Step 19: 13014 + 723 = 13737
Step 20: 13737 + 723 = 14460
Step 21: 14460 + 723 = 15183
Step 22: 15183 + 723 = 15906
Step 23: 15906 + 723 = 16629
Step 24: 16629 + 723 = 17352
Step 25: 17352 + 723 = 18075
Step 26: 18075 + 723 = 18798
Step 27: 18798 + 723 = 19521
Step 28: 19521 + 723 = 20244
Step 29: 20244 + 723 = 20967
Step 30: 20967 + 723 = 21690
Step 31: 21690 + 723 = 22413
Step 32: 22413 + 723 = 23136
Step 33: 23136 + 723 = 23859
Step 34: 23859 + 723 = 24582
Step 35: 24582 + 723 = 25305
Step 36: 25305 + 723 = 26028
Step 37: 26028 + 723 = 26751
Step 38: 26751 + 723 = 27474
Step 39: 27474 + 723 = 28197
Step 40: 28197 + 723 = 28920
Step 41: 28920 + 723 = 29643
Step 42: 29643 + 723 = 30366
Step 43: 30366 + 723 = 31089
Step 44: 31089 + 723 = 31812
Step 45: 31812 + 723 = 32535
Step 46: 32535 + 723 = 33258
Step 47: 33258 + 723 = 33981
Step 48: 33981 + 723 = 34704
Step 49: 34704 + 723 = 35427
Step 50: 35427 + 723 = 36150
Step 51: 36150 + 723 = 36873
Step 52: 36873 + 723 = 37596
Step 53: 37596 + 723 = 38319
Step 54: 38319 + 723 = 39042
Step 55: 39042 + 723 = 39765
Step 56: 39765 + 723 = 40488
Step 57: 40488 + 723 = 41211
Step 58: 41211 + 723 = 41934
Step 59: 41934 + 723 = 42657
Step 60: 42657 + 723 = 43380
Step 61: 43380 + 723 = 44103
Step 62: 44103 + 723 = 44826
Step 63: 44826 + 723 = 45549
Step 64: 45549 + 723 = 46272
Step 65: 46272 + 723 = 46995
Step 66: 46995 + 723 = 47718
Step 67: 47718 + 723 = 48441
Step 68: 48441 + 723 = 49164
Step 69: 49164 + 723 = 49887
Step 70: 49887 + 723 = 50610
Step 71: 50610 + 723 = 51333
Step 72: 51333 + 723 = 52056
Step 73: 52056 + 723 = 52779
Step 74: 52779 + 723 = 53502
Step 75: 53502 + 723 = 54225
Step 76: 54225 + 723 = 54948
Step 77: 54948 + 723 = 55671
Step 78: 55671 + 723 = 56394
Step 79: 56394 + 723 = 57117
Step 80: 57117 + 723 = 57840
Step 81: 57840 + 723 = 58563
Step 82: 58563 + 723 = 59286
Step 83: 59286 + 723 = 60009
Step 84: 60009 + 723 = 60732
Step 85: 60732 + 723 = 61455
Step 86: 61455 + 723 = 62178
Step 87: 62178 + 723 = 62901
Step 88: 62901 + 723 = 63624
Step 89: 63624 + 723 = 64347
Step 90: 64347 + 723 = 65070
Step 91: 65070 + 723 = 65793
Step 92: 65793 + 723 = 66516
Step 93: 66516 + 723 = 67239
Step 94: 67239 + 723 = 67962
Step 95: 67962 + 723 = 68685
Step 96: 68685 + 723 = 69408
Step 97: 69408 + 723 = 70131
Step 98: 70131 + 723 = 70854
Step 99: 70854 + 723 = 71577
Step 100: 71577 + 723 = 72300
Step 101: 72300 + 723 = 73023
Step 102: 73023 + 723 = 73746
Step 103: 73746 + 723 = 74469
Step 104: 74469 + 723 = 75192
Step 105: 75192 + 723 = 75915
Step 106: 75915 + 723 = 76638
Step 107: 76638 + 723 = 77361
Step 108: 77361 + 723 = 78084
Step 109: 78084 + 723 = 78807
Step 110: 78807 + 723 = 79530
Step 111: 79530 + 723 = 80253
Step 112: 80253 + 723 = 80976
Step 113: 80976 + 723 = 81699
Step 114: 81699 + 723 = 82422
Step 115: 82422 + 723 = 83145
Step 116: 83145 + 723 = 83868
Step 117: 83868 + 723 = 84591
Step 118: 84591 + 723 = 85314
Step 119: 85314 + 723 = 86037
Step 120: 86037 + 723 = 86760
Step 121: 86760 + 723 = 87483
Step 122: 87483 + 723 = 88206
Step 123: 88206 + 723 = 88929
Step 124: 88929 + 723 = 89652
Step 125: 89652 + 723 = 90375
Step 126: 90375 + 723 = 91098
Step 127: 91098 + 723 = 91821
Step 128: 91821 + 723 = 92544
Step 129: 92544 + 723 = 93267
Step 130: 93267 + 723 = 93990
Step 131: 93990 + 723 = 94713
Step 132: 94713 + 723 = 95436
Step 133: 95436 + 723 = 96159
Step 134: 96159 + 723 = 96882
Step 135: 96882 + 723 = 97605
Step 136: 97605 + 723 = 98328
Step 137: 98328 + 723 = 99051
Step 138: 99051 + 723 = 99774
Step 139: 99774 + 723 = 100497
Step 140: 100497 + 723 = 101220
Step 141: 101220 + 723 = 101943
Step 142: 101943 + 723 = 102666
Step 143: 102666 + 723 = 103389
Step 144: 103389 + 723 = 104112
Step 145: 104112 + 723 = 104835
Step 146: 104835 + 723 = 105558
Step 147: 105558 + 723 = 106281
Step 148: 106281 + 723 = 107004
Step 149: 107004 + 723 = 107727
Step 150: 107727 + 723 = 108450
Step 151: 108450 + 723 = 109173
Step 152: 109173 + 723 = 109896
Step 153: 109896 + 723 = 110619
Step 154: 110619 + 723 = 111342
Step 155: 111342 + 723 = 112065
Step 156: 112065 + 723 = 112788
Step 157: 112788 + 723 = 113511
Step 158: 113511 + 723 = 114234
Step 159: 114234 + 723 = 114957
Step 160: 114957 + 723 = 115680
Step 161: 115680 + 723 = 116403
Step 162: 116403 + 723 = 117126
Step 163: 117126 + 723 = 117849
Step 164: 117849 + 723 = 118572
Step 165: 118572 + 723 = 119295
Step 166: 119295 + 723 = 120018
Step 167: 120018 + 723 = 120741
Step 168: 120741 + 723 = 121464
Step 169: 121464 + 723 = 122187
Step 170: 122187 + 723 = 122910
Step 171: 122910 + 723 = 123633
Step 172: 123633 + 723 = 124356
Step 173: 124356 + 723 = 125079
Step 174: 125079 + 723 = 125802
Step 175: 125802 + 723 = 126525
Step 176: 126525 + 723 = 127248
Step 177: 127248 + 723 = 127971
Step 178: 127971 + 723 = 128694
Step 179: 128694 + 723 = 129417
Step 180: 129417 + 723 = 130140
Step 181: 130140 + 723 = 130863
Step 182: 130863 + 723 = 131586
Step 183: 131586 + 723 = 132309
Step 184: 132309 + 723 = 133032
Step 185: 133032 + 723 = 133755
Step 186: 133755 + 723 = 134478
Step 187: 134478 + 723 = 135201
Step 188: 135201 + 723 = 135924
Step 189: 135924 + 723 = 136647
Step 190: 136647 + 723 = 137370
Step 191: 137370 + 723 = 138093
Step 192: 138093 + 723 = 138816
Step 193: 138816 + 723 = 139539
Step 194: 139539 + 723 = 140262
Step 195: 140262 + 723 = 140985
Step 196: 140985 + 723 = 141708
Step 197: 141708 + 723 = 142431
Step 198: 142431 + 723 = 143154
Step 199: 143154 + 723 = 143877
Step 200: 143877 + 723 = 144600
Step 201: 144600 + 723 = 145323
Step 202: 145323 + 723 = 146046
Step 203: 146046 + 723 = 146769
Step 204: 146769 + 723 = 147492
Step 205: 147492 + 723 = 148215
Step 206: 148215 + 723 = 148938
Step 207: 148938 + 723 = 149661
Step 208: 149661 + 723 = 150384
Step 209: 150384 + 723 = 151107
Step 210: 151107 + 723 = 151830
Step 211: 151830 + 723 = 152553
Step 212: 152553 + 723 = 153276
Step 213: 153276 + 723 = 153999
Step 214: 153999 + 723 = 154722
Step 215: 154722 + 723 = 155445
Step 216: 155445 + 723 = 156168
Step 217: 156168 + 723 = 156891
Step 218: 156891 + 723 = 157614
Step 219: 157614 + 723 = 158337
Step 220: 158337 + 723 = 159060
Step 221: 159060 + 723 = 159783
Step 222: 159783 + 723 = 160506
Step 223: 160506 + 723 = 161229
Step 224: 161229 + 723 = 161952
Step 225: 161952 + 723 = 162675
Step 226: 162675 + 723 = 163398
Step 227: 163398 + 723 = 164121
Step 228: 164121 + 723 = 164844
Step 229: 164844 + 723 = 165567
Step 230: 165567 + 723 = 166290
Step 231: 166290 + 723 = 167013
Step 232: 167013 + 723 = 167736
Step 233: 167736 + 723 = 168459
Step 234: 168459 + 723 = 169182
Step 235: 169182 + 723 = 169905
Step 236: 169905 + 723 = 170628

So, 723*236 = 170628