Let's roll up our sleeves and solve this. We have 345 and we're going to multiply it by 192, essentially adding 345 to itself 192 times.
Step 1: 0 + 345 = 345
Step 2: 345 + 345 = 690
Step 3: 690 + 345 = 1035
Step 4: 1035 + 345 = 1380
Step 5: 1380 + 345 = 1725
Step 6: 1725 + 345 = 2070
Step 7: 2070 + 345 = 2415
Step 8: 2415 + 345 = 2760
Step 9: 2760 + 345 = 3105
Step 10: 3105 + 345 = 3450
Step 11: 3450 + 345 = 3795
Step 12: 3795 + 345 = 4140
Step 13: 4140 + 345 = 4485
Step 14: 4485 + 345 = 4830
Step 15: 4830 + 345 = 5175
Step 16: 5175 + 345 = 5520
Step 17: 5520 + 345 = 5865
Step 18: 5865 + 345 = 6210
Step 19: 6210 + 345 = 6555
Step 20: 6555 + 345 = 6900
Step 21: 6900 + 345 = 7245
Step 22: 7245 + 345 = 7590
Step 23: 7590 + 345 = 7935
Step 24: 7935 + 345 = 8280
Step 25: 8280 + 345 = 8625
Step 26: 8625 + 345 = 8970
Step 27: 8970 + 345 = 9315
Step 28: 9315 + 345 = 9660
Step 29: 9660 + 345 = 10005
Step 30: 10005 + 345 = 10350
Step 31: 10350 + 345 = 10695
Step 32: 10695 + 345 = 11040
Step 33: 11040 + 345 = 11385
Step 34: 11385 + 345 = 11730
Step 35: 11730 + 345 = 12075
Step 36: 12075 + 345 = 12420
Step 37: 12420 + 345 = 12765
Step 38: 12765 + 345 = 13110
Step 39: 13110 + 345 = 13455
Step 40: 13455 + 345 = 13800
Step 41: 13800 + 345 = 14145
Step 42: 14145 + 345 = 14490
Step 43: 14490 + 345 = 14835
Step 44: 14835 + 345 = 15180
Step 45: 15180 + 345 = 15525
Step 46: 15525 + 345 = 15870
Step 47: 15870 + 345 = 16215
Step 48: 16215 + 345 = 16560
Step 49: 16560 + 345 = 16905
Step 50: 16905 + 345 = 17250
Step 51: 17250 + 345 = 17595
Step 52: 17595 + 345 = 17940
Step 53: 17940 + 345 = 18285
Step 54: 18285 + 345 = 18630
Step 55: 18630 + 345 = 18975
Step 56: 18975 + 345 = 19320
Step 57: 19320 + 345 = 19665
Step 58: 19665 + 345 = 20010
Step 59: 20010 + 345 = 20355
Step 60: 20355 + 345 = 20700
Step 61: 20700 + 345 = 21045
Step 62: 21045 + 345 = 21390
Step 63: 21390 + 345 = 21735
Step 64: 21735 + 345 = 22080
Step 65: 22080 + 345 = 22425
Step 66: 22425 + 345 = 22770
Step 67: 22770 + 345 = 23115
Step 68: 23115 + 345 = 23460
Step 69: 23460 + 345 = 23805
Step 70: 23805 + 345 = 24150
Step 71: 24150 + 345 = 24495
Step 72: 24495 + 345 = 24840
Step 73: 24840 + 345 = 25185
Step 74: 25185 + 345 = 25530
Step 75: 25530 + 345 = 25875
Step 76: 25875 + 345 = 26220
Step 77: 26220 + 345 = 26565
Step 78: 26565 + 345 = 26910
Step 79: 26910 + 345 = 27255
Step 80: 27255 + 345 = 27600
Step 81: 27600 + 345 = 27945
Step 82: 27945 + 345 = 28290
Step 83: 28290 + 345 = 28635
Step 84: 28635 + 345 = 28980
Step 85: 28980 + 345 = 29325
Step 86: 29325 + 345 = 29670
Step 87: 29670 + 345 = 30015
Step 88: 30015 + 345 = 30360
Step 89: 30360 + 345 = 30705
Step 90: 30705 + 345 = 31050
Step 91: 31050 + 345 = 31395
Step 92: 31395 + 345 = 31740
Step 93: 31740 + 345 = 32085
Step 94: 32085 + 345 = 32430
Step 95: 32430 + 345 = 32775
Step 96: 32775 + 345 = 33120
Step 97: 33120 + 345 = 33465
Step 98: 33465 + 345 = 33810
Step 99: 33810 + 345 = 34155
Step 100: 34155 + 345 = 34500
Step 101: 34500 + 345 = 34845
Step 102: 34845 + 345 = 35190
Step 103: 35190 + 345 = 35535
Step 104: 35535 + 345 = 35880
Step 105: 35880 + 345 = 36225
Step 106: 36225 + 345 = 36570
Step 107: 36570 + 345 = 36915
Step 108: 36915 + 345 = 37260
Step 109: 37260 + 345 = 37605
Step 110: 37605 + 345 = 37950
Step 111: 37950 + 345 = 38295
Step 112: 38295 + 345 = 38640
Step 113: 38640 + 345 = 38985
Step 114: 38985 + 345 = 39330
Step 115: 39330 + 345 = 39675
Step 116: 39675 + 345 = 40020
Step 117: 40020 + 345 = 40365
Step 118: 40365 + 345 = 40710
Step 119: 40710 + 345 = 41055
Step 120: 41055 + 345 = 41400
Step 121: 41400 + 345 = 41745
Step 122: 41745 + 345 = 42090
Step 123: 42090 + 345 = 42435
Step 124: 42435 + 345 = 42780
Step 125: 42780 + 345 = 43125
Step 126: 43125 + 345 = 43470
Step 127: 43470 + 345 = 43815
Step 128: 43815 + 345 = 44160
Step 129: 44160 + 345 = 44505
Step 130: 44505 + 345 = 44850
Step 131: 44850 + 345 = 45195
Step 132: 45195 + 345 = 45540
Step 133: 45540 + 345 = 45885
Step 134: 45885 + 345 = 46230
Step 135: 46230 + 345 = 46575
Step 136: 46575 + 345 = 46920
Step 137: 46920 + 345 = 47265
Step 138: 47265 + 345 = 47610
Step 139: 47610 + 345 = 47955
Step 140: 47955 + 345 = 48300
Step 141: 48300 + 345 = 48645
Step 142: 48645 + 345 = 48990
Step 143: 48990 + 345 = 49335
Step 144: 49335 + 345 = 49680
Step 145: 49680 + 345 = 50025
Step 146: 50025 + 345 = 50370
Step 147: 50370 + 345 = 50715
Step 148: 50715 + 345 = 51060
Step 149: 51060 + 345 = 51405
Step 150: 51405 + 345 = 51750
Step 151: 51750 + 345 = 52095
Step 152: 52095 + 345 = 52440
Step 153: 52440 + 345 = 52785
Step 154: 52785 + 345 = 53130
Step 155: 53130 + 345 = 53475
Step 156: 53475 + 345 = 53820
Step 157: 53820 + 345 = 54165
Step 158: 54165 + 345 = 54510
Step 159: 54510 + 345 = 54855
Step 160: 54855 + 345 = 55200
Step 161: 55200 + 345 = 55545
Step 162: 55545 + 345 = 55890
Step 163: 55890 + 345 = 56235
Step 164: 56235 + 345 = 56580
Step 165: 56580 + 345 = 56925
Step 166: 56925 + 345 = 57270
Step 167: 57270 + 345 = 57615
Step 168: 57615 + 345 = 57960
Step 169: 57960 + 345 = 58305
Step 170: 58305 + 345 = 58650
Step 171: 58650 + 345 = 58995
Step 172: 58995 + 345 = 59340
Step 173: 59340 + 345 = 59685
Step 174: 59685 + 345 = 60030
Step 175: 60030 + 345 = 60375
Step 176: 60375 + 345 = 60720
Step 177: 60720 + 345 = 61065
Step 178: 61065 + 345 = 61410
Step 179: 61410 + 345 = 61755
Step 180: 61755 + 345 = 62100
Step 181: 62100 + 345 = 62445
Step 182: 62445 + 345 = 62790
Step 183: 62790 + 345 = 63135
Step 184: 63135 + 345 = 63480
Step 185: 63480 + 345 = 63825
Step 186: 63825 + 345 = 64170
Step 187: 64170 + 345 = 64515
Step 188: 64515 + 345 = 64860
Step 189: 64860 + 345 = 65205
Step 190: 65205 + 345 = 65550
Step 191: 65550 + 345 = 65895
Step 192: 65895 + 345 = 66240

So, 345*192 = 66240