Alright, let's solve this math problem step by step. First, we have the number 855. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 173. So, we're going to take the number 855 and add it to itself 173 times.
Step 1: 0 + 855 = 855
Step 2: 855 + 855 = 1710
Step 3: 1710 + 855 = 2565
Step 4: 2565 + 855 = 3420
Step 5: 3420 + 855 = 4275
Step 6: 4275 + 855 = 5130
Step 7: 5130 + 855 = 5985
Step 8: 5985 + 855 = 6840
Step 9: 6840 + 855 = 7695
Step 10: 7695 + 855 = 8550
Step 11: 8550 + 855 = 9405
Step 12: 9405 + 855 = 10260
Step 13: 10260 + 855 = 11115
Step 14: 11115 + 855 = 11970
Step 15: 11970 + 855 = 12825
Step 16: 12825 + 855 = 13680
Step 17: 13680 + 855 = 14535
Step 18: 14535 + 855 = 15390
Step 19: 15390 + 855 = 16245
Step 20: 16245 + 855 = 17100
Step 21: 17100 + 855 = 17955
Step 22: 17955 + 855 = 18810
Step 23: 18810 + 855 = 19665
Step 24: 19665 + 855 = 20520
Step 25: 20520 + 855 = 21375
Step 26: 21375 + 855 = 22230
Step 27: 22230 + 855 = 23085
Step 28: 23085 + 855 = 23940
Step 29: 23940 + 855 = 24795
Step 30: 24795 + 855 = 25650
Step 31: 25650 + 855 = 26505
Step 32: 26505 + 855 = 27360
Step 33: 27360 + 855 = 28215
Step 34: 28215 + 855 = 29070
Step 35: 29070 + 855 = 29925
Step 36: 29925 + 855 = 30780
Step 37: 30780 + 855 = 31635
Step 38: 31635 + 855 = 32490
Step 39: 32490 + 855 = 33345
Step 40: 33345 + 855 = 34200
Step 41: 34200 + 855 = 35055
Step 42: 35055 + 855 = 35910
Step 43: 35910 + 855 = 36765
Step 44: 36765 + 855 = 37620
Step 45: 37620 + 855 = 38475
Step 46: 38475 + 855 = 39330
Step 47: 39330 + 855 = 40185
Step 48: 40185 + 855 = 41040
Step 49: 41040 + 855 = 41895
Step 50: 41895 + 855 = 42750
Step 51: 42750 + 855 = 43605
Step 52: 43605 + 855 = 44460
Step 53: 44460 + 855 = 45315
Step 54: 45315 + 855 = 46170
Step 55: 46170 + 855 = 47025
Step 56: 47025 + 855 = 47880
Step 57: 47880 + 855 = 48735
Step 58: 48735 + 855 = 49590
Step 59: 49590 + 855 = 50445
Step 60: 50445 + 855 = 51300
Step 61: 51300 + 855 = 52155
Step 62: 52155 + 855 = 53010
Step 63: 53010 + 855 = 53865
Step 64: 53865 + 855 = 54720
Step 65: 54720 + 855 = 55575
Step 66: 55575 + 855 = 56430
Step 67: 56430 + 855 = 57285
Step 68: 57285 + 855 = 58140
Step 69: 58140 + 855 = 58995
Step 70: 58995 + 855 = 59850
Step 71: 59850 + 855 = 60705
Step 72: 60705 + 855 = 61560
Step 73: 61560 + 855 = 62415
Step 74: 62415 + 855 = 63270
Step 75: 63270 + 855 = 64125
Step 76: 64125 + 855 = 64980
Step 77: 64980 + 855 = 65835
Step 78: 65835 + 855 = 66690
Step 79: 66690 + 855 = 67545
Step 80: 67545 + 855 = 68400
Step 81: 68400 + 855 = 69255
Step 82: 69255 + 855 = 70110
Step 83: 70110 + 855 = 70965
Step 84: 70965 + 855 = 71820
Step 85: 71820 + 855 = 72675
Step 86: 72675 + 855 = 73530
Step 87: 73530 + 855 = 74385
Step 88: 74385 + 855 = 75240
Step 89: 75240 + 855 = 76095
Step 90: 76095 + 855 = 76950
Step 91: 76950 + 855 = 77805
Step 92: 77805 + 855 = 78660
Step 93: 78660 + 855 = 79515
Step 94: 79515 + 855 = 80370
Step 95: 80370 + 855 = 81225
Step 96: 81225 + 855 = 82080
Step 97: 82080 + 855 = 82935
Step 98: 82935 + 855 = 83790
Step 99: 83790 + 855 = 84645
Step 100: 84645 + 855 = 85500
Step 101: 85500 + 855 = 86355
Step 102: 86355 + 855 = 87210
Step 103: 87210 + 855 = 88065
Step 104: 88065 + 855 = 88920
Step 105: 88920 + 855 = 89775
Step 106: 89775 + 855 = 90630
Step 107: 90630 + 855 = 91485
Step 108: 91485 + 855 = 92340
Step 109: 92340 + 855 = 93195
Step 110: 93195 + 855 = 94050
Step 111: 94050 + 855 = 94905
Step 112: 94905 + 855 = 95760
Step 113: 95760 + 855 = 96615
Step 114: 96615 + 855 = 97470
Step 115: 97470 + 855 = 98325
Step 116: 98325 + 855 = 99180
Step 117: 99180 + 855 = 100035
Step 118: 100035 + 855 = 100890
Step 119: 100890 + 855 = 101745
Step 120: 101745 + 855 = 102600
Step 121: 102600 + 855 = 103455
Step 122: 103455 + 855 = 104310
Step 123: 104310 + 855 = 105165
Step 124: 105165 + 855 = 106020
Step 125: 106020 + 855 = 106875
Step 126: 106875 + 855 = 107730
Step 127: 107730 + 855 = 108585
Step 128: 108585 + 855 = 109440
Step 129: 109440 + 855 = 110295
Step 130: 110295 + 855 = 111150
Step 131: 111150 + 855 = 112005
Step 132: 112005 + 855 = 112860
Step 133: 112860 + 855 = 113715
Step 134: 113715 + 855 = 114570
Step 135: 114570 + 855 = 115425
Step 136: 115425 + 855 = 116280
Step 137: 116280 + 855 = 117135
Step 138: 117135 + 855 = 117990
Step 139: 117990 + 855 = 118845
Step 140: 118845 + 855 = 119700
Step 141: 119700 + 855 = 120555
Step 142: 120555 + 855 = 121410
Step 143: 121410 + 855 = 122265
Step 144: 122265 + 855 = 123120
Step 145: 123120 + 855 = 123975
Step 146: 123975 + 855 = 124830
Step 147: 124830 + 855 = 125685
Step 148: 125685 + 855 = 126540
Step 149: 126540 + 855 = 127395
Step 150: 127395 + 855 = 128250
Step 151: 128250 + 855 = 129105
Step 152: 129105 + 855 = 129960
Step 153: 129960 + 855 = 130815
Step 154: 130815 + 855 = 131670
Step 155: 131670 + 855 = 132525
Step 156: 132525 + 855 = 133380
Step 157: 133380 + 855 = 134235
Step 158: 134235 + 855 = 135090
Step 159: 135090 + 855 = 135945
Step 160: 135945 + 855 = 136800
Step 161: 136800 + 855 = 137655
Step 162: 137655 + 855 = 138510
Step 163: 138510 + 855 = 139365
Step 164: 139365 + 855 = 140220
Step 165: 140220 + 855 = 141075
Step 166: 141075 + 855 = 141930
Step 167: 141930 + 855 = 142785
Step 168: 142785 + 855 = 143640
Step 169: 143640 + 855 = 144495
Step 170: 144495 + 855 = 145350
Step 171: 145350 + 855 = 146205
Step 172: 146205 + 855 = 147060
Step 173: 147060 + 855 = 147915

So, 855*173 = 147915