OK, let's crack this. We're given 923 and our task is to multiply it by 136. Essentially, we'll be adding 923 to itself 136 times.
Step 1: 0 + 923 = 923
Step 2: 923 + 923 = 1846
Step 3: 1846 + 923 = 2769
Step 4: 2769 + 923 = 3692
Step 5: 3692 + 923 = 4615
Step 6: 4615 + 923 = 5538
Step 7: 5538 + 923 = 6461
Step 8: 6461 + 923 = 7384
Step 9: 7384 + 923 = 8307
Step 10: 8307 + 923 = 9230
Step 11: 9230 + 923 = 10153
Step 12: 10153 + 923 = 11076
Step 13: 11076 + 923 = 11999
Step 14: 11999 + 923 = 12922
Step 15: 12922 + 923 = 13845
Step 16: 13845 + 923 = 14768
Step 17: 14768 + 923 = 15691
Step 18: 15691 + 923 = 16614
Step 19: 16614 + 923 = 17537
Step 20: 17537 + 923 = 18460
Step 21: 18460 + 923 = 19383
Step 22: 19383 + 923 = 20306
Step 23: 20306 + 923 = 21229
Step 24: 21229 + 923 = 22152
Step 25: 22152 + 923 = 23075
Step 26: 23075 + 923 = 23998
Step 27: 23998 + 923 = 24921
Step 28: 24921 + 923 = 25844
Step 29: 25844 + 923 = 26767
Step 30: 26767 + 923 = 27690
Step 31: 27690 + 923 = 28613
Step 32: 28613 + 923 = 29536
Step 33: 29536 + 923 = 30459
Step 34: 30459 + 923 = 31382
Step 35: 31382 + 923 = 32305
Step 36: 32305 + 923 = 33228
Step 37: 33228 + 923 = 34151
Step 38: 34151 + 923 = 35074
Step 39: 35074 + 923 = 35997
Step 40: 35997 + 923 = 36920
Step 41: 36920 + 923 = 37843
Step 42: 37843 + 923 = 38766
Step 43: 38766 + 923 = 39689
Step 44: 39689 + 923 = 40612
Step 45: 40612 + 923 = 41535
Step 46: 41535 + 923 = 42458
Step 47: 42458 + 923 = 43381
Step 48: 43381 + 923 = 44304
Step 49: 44304 + 923 = 45227
Step 50: 45227 + 923 = 46150
Step 51: 46150 + 923 = 47073
Step 52: 47073 + 923 = 47996
Step 53: 47996 + 923 = 48919
Step 54: 48919 + 923 = 49842
Step 55: 49842 + 923 = 50765
Step 56: 50765 + 923 = 51688
Step 57: 51688 + 923 = 52611
Step 58: 52611 + 923 = 53534
Step 59: 53534 + 923 = 54457
Step 60: 54457 + 923 = 55380
Step 61: 55380 + 923 = 56303
Step 62: 56303 + 923 = 57226
Step 63: 57226 + 923 = 58149
Step 64: 58149 + 923 = 59072
Step 65: 59072 + 923 = 59995
Step 66: 59995 + 923 = 60918
Step 67: 60918 + 923 = 61841
Step 68: 61841 + 923 = 62764
Step 69: 62764 + 923 = 63687
Step 70: 63687 + 923 = 64610
Step 71: 64610 + 923 = 65533
Step 72: 65533 + 923 = 66456
Step 73: 66456 + 923 = 67379
Step 74: 67379 + 923 = 68302
Step 75: 68302 + 923 = 69225
Step 76: 69225 + 923 = 70148
Step 77: 70148 + 923 = 71071
Step 78: 71071 + 923 = 71994
Step 79: 71994 + 923 = 72917
Step 80: 72917 + 923 = 73840
Step 81: 73840 + 923 = 74763
Step 82: 74763 + 923 = 75686
Step 83: 75686 + 923 = 76609
Step 84: 76609 + 923 = 77532
Step 85: 77532 + 923 = 78455
Step 86: 78455 + 923 = 79378
Step 87: 79378 + 923 = 80301
Step 88: 80301 + 923 = 81224
Step 89: 81224 + 923 = 82147
Step 90: 82147 + 923 = 83070
Step 91: 83070 + 923 = 83993
Step 92: 83993 + 923 = 84916
Step 93: 84916 + 923 = 85839
Step 94: 85839 + 923 = 86762
Step 95: 86762 + 923 = 87685
Step 96: 87685 + 923 = 88608
Step 97: 88608 + 923 = 89531
Step 98: 89531 + 923 = 90454
Step 99: 90454 + 923 = 91377
Step 100: 91377 + 923 = 92300
Step 101: 92300 + 923 = 93223
Step 102: 93223 + 923 = 94146
Step 103: 94146 + 923 = 95069
Step 104: 95069 + 923 = 95992
Step 105: 95992 + 923 = 96915
Step 106: 96915 + 923 = 97838
Step 107: 97838 + 923 = 98761
Step 108: 98761 + 923 = 99684
Step 109: 99684 + 923 = 100607
Step 110: 100607 + 923 = 101530
Step 111: 101530 + 923 = 102453
Step 112: 102453 + 923 = 103376
Step 113: 103376 + 923 = 104299
Step 114: 104299 + 923 = 105222
Step 115: 105222 + 923 = 106145
Step 116: 106145 + 923 = 107068
Step 117: 107068 + 923 = 107991
Step 118: 107991 + 923 = 108914
Step 119: 108914 + 923 = 109837
Step 120: 109837 + 923 = 110760
Step 121: 110760 + 923 = 111683
Step 122: 111683 + 923 = 112606
Step 123: 112606 + 923 = 113529
Step 124: 113529 + 923 = 114452
Step 125: 114452 + 923 = 115375
Step 126: 115375 + 923 = 116298
Step 127: 116298 + 923 = 117221
Step 128: 117221 + 923 = 118144
Step 129: 118144 + 923 = 119067
Step 130: 119067 + 923 = 119990
Step 131: 119990 + 923 = 120913
Step 132: 120913 + 923 = 121836
Step 133: 121836 + 923 = 122759
Step 134: 122759 + 923 = 123682
Step 135: 123682 + 923 = 124605
Step 136: 124605 + 923 = 125528

So, 923*136 = 125528