Alright, let's solve this math problem step by step. First, we have the number 345. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 155. So, we're going to take the number 345 and add it to itself 155 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

So, 345*155 = 53475