Let's get this math done. We have 342 and we're going to multiply it by 135. This is the same as taking 342 and adding it to itself 135 times.
Step 1: 0 + 342 = 342
Step 2: 342 + 342 = 684
Step 3: 684 + 342 = 1026
Step 4: 1026 + 342 = 1368
Step 5: 1368 + 342 = 1710
Step 6: 1710 + 342 = 2052
Step 7: 2052 + 342 = 2394
Step 8: 2394 + 342 = 2736
Step 9: 2736 + 342 = 3078
Step 10: 3078 + 342 = 3420
Step 11: 3420 + 342 = 3762
Step 12: 3762 + 342 = 4104
Step 13: 4104 + 342 = 4446
Step 14: 4446 + 342 = 4788
Step 15: 4788 + 342 = 5130
Step 16: 5130 + 342 = 5472
Step 17: 5472 + 342 = 5814
Step 18: 5814 + 342 = 6156
Step 19: 6156 + 342 = 6498
Step 20: 6498 + 342 = 6840
Step 21: 6840 + 342 = 7182
Step 22: 7182 + 342 = 7524
Step 23: 7524 + 342 = 7866
Step 24: 7866 + 342 = 8208
Step 25: 8208 + 342 = 8550
Step 26: 8550 + 342 = 8892
Step 27: 8892 + 342 = 9234
Step 28: 9234 + 342 = 9576
Step 29: 9576 + 342 = 9918
Step 30: 9918 + 342 = 10260
Step 31: 10260 + 342 = 10602
Step 32: 10602 + 342 = 10944
Step 33: 10944 + 342 = 11286
Step 34: 11286 + 342 = 11628
Step 35: 11628 + 342 = 11970
Step 36: 11970 + 342 = 12312
Step 37: 12312 + 342 = 12654
Step 38: 12654 + 342 = 12996
Step 39: 12996 + 342 = 13338
Step 40: 13338 + 342 = 13680
Step 41: 13680 + 342 = 14022
Step 42: 14022 + 342 = 14364
Step 43: 14364 + 342 = 14706
Step 44: 14706 + 342 = 15048
Step 45: 15048 + 342 = 15390
Step 46: 15390 + 342 = 15732
Step 47: 15732 + 342 = 16074
Step 48: 16074 + 342 = 16416
Step 49: 16416 + 342 = 16758
Step 50: 16758 + 342 = 17100
Step 51: 17100 + 342 = 17442
Step 52: 17442 + 342 = 17784
Step 53: 17784 + 342 = 18126
Step 54: 18126 + 342 = 18468
Step 55: 18468 + 342 = 18810
Step 56: 18810 + 342 = 19152
Step 57: 19152 + 342 = 19494
Step 58: 19494 + 342 = 19836
Step 59: 19836 + 342 = 20178
Step 60: 20178 + 342 = 20520
Step 61: 20520 + 342 = 20862
Step 62: 20862 + 342 = 21204
Step 63: 21204 + 342 = 21546
Step 64: 21546 + 342 = 21888
Step 65: 21888 + 342 = 22230
Step 66: 22230 + 342 = 22572
Step 67: 22572 + 342 = 22914
Step 68: 22914 + 342 = 23256
Step 69: 23256 + 342 = 23598
Step 70: 23598 + 342 = 23940
Step 71: 23940 + 342 = 24282
Step 72: 24282 + 342 = 24624
Step 73: 24624 + 342 = 24966
Step 74: 24966 + 342 = 25308
Step 75: 25308 + 342 = 25650
Step 76: 25650 + 342 = 25992
Step 77: 25992 + 342 = 26334
Step 78: 26334 + 342 = 26676
Step 79: 26676 + 342 = 27018
Step 80: 27018 + 342 = 27360
Step 81: 27360 + 342 = 27702
Step 82: 27702 + 342 = 28044
Step 83: 28044 + 342 = 28386
Step 84: 28386 + 342 = 28728
Step 85: 28728 + 342 = 29070
Step 86: 29070 + 342 = 29412
Step 87: 29412 + 342 = 29754
Step 88: 29754 + 342 = 30096
Step 89: 30096 + 342 = 30438
Step 90: 30438 + 342 = 30780
Step 91: 30780 + 342 = 31122
Step 92: 31122 + 342 = 31464
Step 93: 31464 + 342 = 31806
Step 94: 31806 + 342 = 32148
Step 95: 32148 + 342 = 32490
Step 96: 32490 + 342 = 32832
Step 97: 32832 + 342 = 33174
Step 98: 33174 + 342 = 33516
Step 99: 33516 + 342 = 33858
Step 100: 33858 + 342 = 34200
Step 101: 34200 + 342 = 34542
Step 102: 34542 + 342 = 34884
Step 103: 34884 + 342 = 35226
Step 104: 35226 + 342 = 35568
Step 105: 35568 + 342 = 35910
Step 106: 35910 + 342 = 36252
Step 107: 36252 + 342 = 36594
Step 108: 36594 + 342 = 36936
Step 109: 36936 + 342 = 37278
Step 110: 37278 + 342 = 37620
Step 111: 37620 + 342 = 37962
Step 112: 37962 + 342 = 38304
Step 113: 38304 + 342 = 38646
Step 114: 38646 + 342 = 38988
Step 115: 38988 + 342 = 39330
Step 116: 39330 + 342 = 39672
Step 117: 39672 + 342 = 40014
Step 118: 40014 + 342 = 40356
Step 119: 40356 + 342 = 40698
Step 120: 40698 + 342 = 41040
Step 121: 41040 + 342 = 41382
Step 122: 41382 + 342 = 41724
Step 123: 41724 + 342 = 42066
Step 124: 42066 + 342 = 42408
Step 125: 42408 + 342 = 42750
Step 126: 42750 + 342 = 43092
Step 127: 43092 + 342 = 43434
Step 128: 43434 + 342 = 43776
Step 129: 43776 + 342 = 44118
Step 130: 44118 + 342 = 44460
Step 131: 44460 + 342 = 44802
Step 132: 44802 + 342 = 45144
Step 133: 45144 + 342 = 45486
Step 134: 45486 + 342 = 45828
Step 135: 45828 + 342 = 46170

So, 342*135 = 46170