Alright, let's solve this math problem step by step. First, we have the number 857. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 253. So, we're going to take the number 857 and add it to itself 253 times.
Step 1: 0 + 857 = 857
Step 2: 857 + 857 = 1714
Step 3: 1714 + 857 = 2571
Step 4: 2571 + 857 = 3428
Step 5: 3428 + 857 = 4285
Step 6: 4285 + 857 = 5142
Step 7: 5142 + 857 = 5999
Step 8: 5999 + 857 = 6856
Step 9: 6856 + 857 = 7713
Step 10: 7713 + 857 = 8570
Step 11: 8570 + 857 = 9427
Step 12: 9427 + 857 = 10284
Step 13: 10284 + 857 = 11141
Step 14: 11141 + 857 = 11998
Step 15: 11998 + 857 = 12855
Step 16: 12855 + 857 = 13712
Step 17: 13712 + 857 = 14569
Step 18: 14569 + 857 = 15426
Step 19: 15426 + 857 = 16283
Step 20: 16283 + 857 = 17140
Step 21: 17140 + 857 = 17997
Step 22: 17997 + 857 = 18854
Step 23: 18854 + 857 = 19711
Step 24: 19711 + 857 = 20568
Step 25: 20568 + 857 = 21425
Step 26: 21425 + 857 = 22282
Step 27: 22282 + 857 = 23139
Step 28: 23139 + 857 = 23996
Step 29: 23996 + 857 = 24853
Step 30: 24853 + 857 = 25710
Step 31: 25710 + 857 = 26567
Step 32: 26567 + 857 = 27424
Step 33: 27424 + 857 = 28281
Step 34: 28281 + 857 = 29138
Step 35: 29138 + 857 = 29995
Step 36: 29995 + 857 = 30852
Step 37: 30852 + 857 = 31709
Step 38: 31709 + 857 = 32566
Step 39: 32566 + 857 = 33423
Step 40: 33423 + 857 = 34280
Step 41: 34280 + 857 = 35137
Step 42: 35137 + 857 = 35994
Step 43: 35994 + 857 = 36851
Step 44: 36851 + 857 = 37708
Step 45: 37708 + 857 = 38565
Step 46: 38565 + 857 = 39422
Step 47: 39422 + 857 = 40279
Step 48: 40279 + 857 = 41136
Step 49: 41136 + 857 = 41993
Step 50: 41993 + 857 = 42850
Step 51: 42850 + 857 = 43707
Step 52: 43707 + 857 = 44564
Step 53: 44564 + 857 = 45421
Step 54: 45421 + 857 = 46278
Step 55: 46278 + 857 = 47135
Step 56: 47135 + 857 = 47992
Step 57: 47992 + 857 = 48849
Step 58: 48849 + 857 = 49706
Step 59: 49706 + 857 = 50563
Step 60: 50563 + 857 = 51420
Step 61: 51420 + 857 = 52277
Step 62: 52277 + 857 = 53134
Step 63: 53134 + 857 = 53991
Step 64: 53991 + 857 = 54848
Step 65: 54848 + 857 = 55705
Step 66: 55705 + 857 = 56562
Step 67: 56562 + 857 = 57419
Step 68: 57419 + 857 = 58276
Step 69: 58276 + 857 = 59133
Step 70: 59133 + 857 = 59990
Step 71: 59990 + 857 = 60847
Step 72: 60847 + 857 = 61704
Step 73: 61704 + 857 = 62561
Step 74: 62561 + 857 = 63418
Step 75: 63418 + 857 = 64275
Step 76: 64275 + 857 = 65132
Step 77: 65132 + 857 = 65989
Step 78: 65989 + 857 = 66846
Step 79: 66846 + 857 = 67703
Step 80: 67703 + 857 = 68560
Step 81: 68560 + 857 = 69417
Step 82: 69417 + 857 = 70274
Step 83: 70274 + 857 = 71131
Step 84: 71131 + 857 = 71988
Step 85: 71988 + 857 = 72845
Step 86: 72845 + 857 = 73702
Step 87: 73702 + 857 = 74559
Step 88: 74559 + 857 = 75416
Step 89: 75416 + 857 = 76273
Step 90: 76273 + 857 = 77130
Step 91: 77130 + 857 = 77987
Step 92: 77987 + 857 = 78844
Step 93: 78844 + 857 = 79701
Step 94: 79701 + 857 = 80558
Step 95: 80558 + 857 = 81415
Step 96: 81415 + 857 = 82272
Step 97: 82272 + 857 = 83129
Step 98: 83129 + 857 = 83986
Step 99: 83986 + 857 = 84843
Step 100: 84843 + 857 = 85700
Step 101: 85700 + 857 = 86557
Step 102: 86557 + 857 = 87414
Step 103: 87414 + 857 = 88271
Step 104: 88271 + 857 = 89128
Step 105: 89128 + 857 = 89985
Step 106: 89985 + 857 = 90842
Step 107: 90842 + 857 = 91699
Step 108: 91699 + 857 = 92556
Step 109: 92556 + 857 = 93413
Step 110: 93413 + 857 = 94270
Step 111: 94270 + 857 = 95127
Step 112: 95127 + 857 = 95984
Step 113: 95984 + 857 = 96841
Step 114: 96841 + 857 = 97698
Step 115: 97698 + 857 = 98555
Step 116: 98555 + 857 = 99412
Step 117: 99412 + 857 = 100269
Step 118: 100269 + 857 = 101126
Step 119: 101126 + 857 = 101983
Step 120: 101983 + 857 = 102840
Step 121: 102840 + 857 = 103697
Step 122: 103697 + 857 = 104554
Step 123: 104554 + 857 = 105411
Step 124: 105411 + 857 = 106268
Step 125: 106268 + 857 = 107125
Step 126: 107125 + 857 = 107982
Step 127: 107982 + 857 = 108839
Step 128: 108839 + 857 = 109696
Step 129: 109696 + 857 = 110553
Step 130: 110553 + 857 = 111410
Step 131: 111410 + 857 = 112267
Step 132: 112267 + 857 = 113124
Step 133: 113124 + 857 = 113981
Step 134: 113981 + 857 = 114838
Step 135: 114838 + 857 = 115695
Step 136: 115695 + 857 = 116552
Step 137: 116552 + 857 = 117409
Step 138: 117409 + 857 = 118266
Step 139: 118266 + 857 = 119123
Step 140: 119123 + 857 = 119980
Step 141: 119980 + 857 = 120837
Step 142: 120837 + 857 = 121694
Step 143: 121694 + 857 = 122551
Step 144: 122551 + 857 = 123408
Step 145: 123408 + 857 = 124265
Step 146: 124265 + 857 = 125122
Step 147: 125122 + 857 = 125979
Step 148: 125979 + 857 = 126836
Step 149: 126836 + 857 = 127693
Step 150: 127693 + 857 = 128550
Step 151: 128550 + 857 = 129407
Step 152: 129407 + 857 = 130264
Step 153: 130264 + 857 = 131121
Step 154: 131121 + 857 = 131978
Step 155: 131978 + 857 = 132835
Step 156: 132835 + 857 = 133692
Step 157: 133692 + 857 = 134549
Step 158: 134549 + 857 = 135406
Step 159: 135406 + 857 = 136263
Step 160: 136263 + 857 = 137120
Step 161: 137120 + 857 = 137977
Step 162: 137977 + 857 = 138834
Step 163: 138834 + 857 = 139691
Step 164: 139691 + 857 = 140548
Step 165: 140548 + 857 = 141405
Step 166: 141405 + 857 = 142262
Step 167: 142262 + 857 = 143119
Step 168: 143119 + 857 = 143976
Step 169: 143976 + 857 = 144833
Step 170: 144833 + 857 = 145690
Step 171: 145690 + 857 = 146547
Step 172: 146547 + 857 = 147404
Step 173: 147404 + 857 = 148261
Step 174: 148261 + 857 = 149118
Step 175: 149118 + 857 = 149975
Step 176: 149975 + 857 = 150832
Step 177: 150832 + 857 = 151689
Step 178: 151689 + 857 = 152546
Step 179: 152546 + 857 = 153403
Step 180: 153403 + 857 = 154260
Step 181: 154260 + 857 = 155117
Step 182: 155117 + 857 = 155974
Step 183: 155974 + 857 = 156831
Step 184: 156831 + 857 = 157688
Step 185: 157688 + 857 = 158545
Step 186: 158545 + 857 = 159402
Step 187: 159402 + 857 = 160259
Step 188: 160259 + 857 = 161116
Step 189: 161116 + 857 = 161973
Step 190: 161973 + 857 = 162830
Step 191: 162830 + 857 = 163687
Step 192: 163687 + 857 = 164544
Step 193: 164544 + 857 = 165401
Step 194: 165401 + 857 = 166258
Step 195: 166258 + 857 = 167115
Step 196: 167115 + 857 = 167972
Step 197: 167972 + 857 = 168829
Step 198: 168829 + 857 = 169686
Step 199: 169686 + 857 = 170543
Step 200: 170543 + 857 = 171400
Step 201: 171400 + 857 = 172257
Step 202: 172257 + 857 = 173114
Step 203: 173114 + 857 = 173971
Step 204: 173971 + 857 = 174828
Step 205: 174828 + 857 = 175685
Step 206: 175685 + 857 = 176542
Step 207: 176542 + 857 = 177399
Step 208: 177399 + 857 = 178256
Step 209: 178256 + 857 = 179113
Step 210: 179113 + 857 = 179970
Step 211: 179970 + 857 = 180827
Step 212: 180827 + 857 = 181684
Step 213: 181684 + 857 = 182541
Step 214: 182541 + 857 = 183398
Step 215: 183398 + 857 = 184255
Step 216: 184255 + 857 = 185112
Step 217: 185112 + 857 = 185969
Step 218: 185969 + 857 = 186826
Step 219: 186826 + 857 = 187683
Step 220: 187683 + 857 = 188540
Step 221: 188540 + 857 = 189397
Step 222: 189397 + 857 = 190254
Step 223: 190254 + 857 = 191111
Step 224: 191111 + 857 = 191968
Step 225: 191968 + 857 = 192825
Step 226: 192825 + 857 = 193682
Step 227: 193682 + 857 = 194539
Step 228: 194539 + 857 = 195396
Step 229: 195396 + 857 = 196253
Step 230: 196253 + 857 = 197110
Step 231: 197110 + 857 = 197967
Step 232: 197967 + 857 = 198824
Step 233: 198824 + 857 = 199681
Step 234: 199681 + 857 = 200538
Step 235: 200538 + 857 = 201395
Step 236: 201395 + 857 = 202252
Step 237: 202252 + 857 = 203109
Step 238: 203109 + 857 = 203966
Step 239: 203966 + 857 = 204823
Step 240: 204823 + 857 = 205680
Step 241: 205680 + 857 = 206537
Step 242: 206537 + 857 = 207394
Step 243: 207394 + 857 = 208251
Step 244: 208251 + 857 = 209108
Step 245: 209108 + 857 = 209965
Step 246: 209965 + 857 = 210822
Step 247: 210822 + 857 = 211679
Step 248: 211679 + 857 = 212536
Step 249: 212536 + 857 = 213393
Step 250: 213393 + 857 = 214250
Step 251: 214250 + 857 = 215107
Step 252: 215107 + 857 = 215964
Step 253: 215964 + 857 = 216821

So, 857*253 = 216821