Alright, let's solve this math problem step by step. First, we have the number 837. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 321. So, we're going to take the number 837 and add it to itself 321 times.
Step 1: 0 + 837 = 837
Step 2: 837 + 837 = 1674
Step 3: 1674 + 837 = 2511
Step 4: 2511 + 837 = 3348
Step 5: 3348 + 837 = 4185
Step 6: 4185 + 837 = 5022
Step 7: 5022 + 837 = 5859
Step 8: 5859 + 837 = 6696
Step 9: 6696 + 837 = 7533
Step 10: 7533 + 837 = 8370
Step 11: 8370 + 837 = 9207
Step 12: 9207 + 837 = 10044
Step 13: 10044 + 837 = 10881
Step 14: 10881 + 837 = 11718
Step 15: 11718 + 837 = 12555
Step 16: 12555 + 837 = 13392
Step 17: 13392 + 837 = 14229
Step 18: 14229 + 837 = 15066
Step 19: 15066 + 837 = 15903
Step 20: 15903 + 837 = 16740
Step 21: 16740 + 837 = 17577
Step 22: 17577 + 837 = 18414
Step 23: 18414 + 837 = 19251
Step 24: 19251 + 837 = 20088
Step 25: 20088 + 837 = 20925
Step 26: 20925 + 837 = 21762
Step 27: 21762 + 837 = 22599
Step 28: 22599 + 837 = 23436
Step 29: 23436 + 837 = 24273
Step 30: 24273 + 837 = 25110
Step 31: 25110 + 837 = 25947
Step 32: 25947 + 837 = 26784
Step 33: 26784 + 837 = 27621
Step 34: 27621 + 837 = 28458
Step 35: 28458 + 837 = 29295
Step 36: 29295 + 837 = 30132
Step 37: 30132 + 837 = 30969
Step 38: 30969 + 837 = 31806
Step 39: 31806 + 837 = 32643
Step 40: 32643 + 837 = 33480
Step 41: 33480 + 837 = 34317
Step 42: 34317 + 837 = 35154
Step 43: 35154 + 837 = 35991
Step 44: 35991 + 837 = 36828
Step 45: 36828 + 837 = 37665
Step 46: 37665 + 837 = 38502
Step 47: 38502 + 837 = 39339
Step 48: 39339 + 837 = 40176
Step 49: 40176 + 837 = 41013
Step 50: 41013 + 837 = 41850
Step 51: 41850 + 837 = 42687
Step 52: 42687 + 837 = 43524
Step 53: 43524 + 837 = 44361
Step 54: 44361 + 837 = 45198
Step 55: 45198 + 837 = 46035
Step 56: 46035 + 837 = 46872
Step 57: 46872 + 837 = 47709
Step 58: 47709 + 837 = 48546
Step 59: 48546 + 837 = 49383
Step 60: 49383 + 837 = 50220
Step 61: 50220 + 837 = 51057
Step 62: 51057 + 837 = 51894
Step 63: 51894 + 837 = 52731
Step 64: 52731 + 837 = 53568
Step 65: 53568 + 837 = 54405
Step 66: 54405 + 837 = 55242
Step 67: 55242 + 837 = 56079
Step 68: 56079 + 837 = 56916
Step 69: 56916 + 837 = 57753
Step 70: 57753 + 837 = 58590
Step 71: 58590 + 837 = 59427
Step 72: 59427 + 837 = 60264
Step 73: 60264 + 837 = 61101
Step 74: 61101 + 837 = 61938
Step 75: 61938 + 837 = 62775
Step 76: 62775 + 837 = 63612
Step 77: 63612 + 837 = 64449
Step 78: 64449 + 837 = 65286
Step 79: 65286 + 837 = 66123
Step 80: 66123 + 837 = 66960
Step 81: 66960 + 837 = 67797
Step 82: 67797 + 837 = 68634
Step 83: 68634 + 837 = 69471
Step 84: 69471 + 837 = 70308
Step 85: 70308 + 837 = 71145
Step 86: 71145 + 837 = 71982
Step 87: 71982 + 837 = 72819
Step 88: 72819 + 837 = 73656
Step 89: 73656 + 837 = 74493
Step 90: 74493 + 837 = 75330
Step 91: 75330 + 837 = 76167
Step 92: 76167 + 837 = 77004
Step 93: 77004 + 837 = 77841
Step 94: 77841 + 837 = 78678
Step 95: 78678 + 837 = 79515
Step 96: 79515 + 837 = 80352
Step 97: 80352 + 837 = 81189
Step 98: 81189 + 837 = 82026
Step 99: 82026 + 837 = 82863
Step 100: 82863 + 837 = 83700
Step 101: 83700 + 837 = 84537
Step 102: 84537 + 837 = 85374
Step 103: 85374 + 837 = 86211
Step 104: 86211 + 837 = 87048
Step 105: 87048 + 837 = 87885
Step 106: 87885 + 837 = 88722
Step 107: 88722 + 837 = 89559
Step 108: 89559 + 837 = 90396
Step 109: 90396 + 837 = 91233
Step 110: 91233 + 837 = 92070
Step 111: 92070 + 837 = 92907
Step 112: 92907 + 837 = 93744
Step 113: 93744 + 837 = 94581
Step 114: 94581 + 837 = 95418
Step 115: 95418 + 837 = 96255
Step 116: 96255 + 837 = 97092
Step 117: 97092 + 837 = 97929
Step 118: 97929 + 837 = 98766
Step 119: 98766 + 837 = 99603
Step 120: 99603 + 837 = 100440
Step 121: 100440 + 837 = 101277
Step 122: 101277 + 837 = 102114
Step 123: 102114 + 837 = 102951
Step 124: 102951 + 837 = 103788
Step 125: 103788 + 837 = 104625
Step 126: 104625 + 837 = 105462
Step 127: 105462 + 837 = 106299
Step 128: 106299 + 837 = 107136
Step 129: 107136 + 837 = 107973
Step 130: 107973 + 837 = 108810
Step 131: 108810 + 837 = 109647
Step 132: 109647 + 837 = 110484
Step 133: 110484 + 837 = 111321
Step 134: 111321 + 837 = 112158
Step 135: 112158 + 837 = 112995
Step 136: 112995 + 837 = 113832
Step 137: 113832 + 837 = 114669
Step 138: 114669 + 837 = 115506
Step 139: 115506 + 837 = 116343
Step 140: 116343 + 837 = 117180
Step 141: 117180 + 837 = 118017
Step 142: 118017 + 837 = 118854
Step 143: 118854 + 837 = 119691
Step 144: 119691 + 837 = 120528
Step 145: 120528 + 837 = 121365
Step 146: 121365 + 837 = 122202
Step 147: 122202 + 837 = 123039
Step 148: 123039 + 837 = 123876
Step 149: 123876 + 837 = 124713
Step 150: 124713 + 837 = 125550
Step 151: 125550 + 837 = 126387
Step 152: 126387 + 837 = 127224
Step 153: 127224 + 837 = 128061
Step 154: 128061 + 837 = 128898
Step 155: 128898 + 837 = 129735
Step 156: 129735 + 837 = 130572
Step 157: 130572 + 837 = 131409
Step 158: 131409 + 837 = 132246
Step 159: 132246 + 837 = 133083
Step 160: 133083 + 837 = 133920
Step 161: 133920 + 837 = 134757
Step 162: 134757 + 837 = 135594
Step 163: 135594 + 837 = 136431
Step 164: 136431 + 837 = 137268
Step 165: 137268 + 837 = 138105
Step 166: 138105 + 837 = 138942
Step 167: 138942 + 837 = 139779
Step 168: 139779 + 837 = 140616
Step 169: 140616 + 837 = 141453
Step 170: 141453 + 837 = 142290
Step 171: 142290 + 837 = 143127
Step 172: 143127 + 837 = 143964
Step 173: 143964 + 837 = 144801
Step 174: 144801 + 837 = 145638
Step 175: 145638 + 837 = 146475
Step 176: 146475 + 837 = 147312
Step 177: 147312 + 837 = 148149
Step 178: 148149 + 837 = 148986
Step 179: 148986 + 837 = 149823
Step 180: 149823 + 837 = 150660
Step 181: 150660 + 837 = 151497
Step 182: 151497 + 837 = 152334
Step 183: 152334 + 837 = 153171
Step 184: 153171 + 837 = 154008
Step 185: 154008 + 837 = 154845
Step 186: 154845 + 837 = 155682
Step 187: 155682 + 837 = 156519
Step 188: 156519 + 837 = 157356
Step 189: 157356 + 837 = 158193
Step 190: 158193 + 837 = 159030
Step 191: 159030 + 837 = 159867
Step 192: 159867 + 837 = 160704
Step 193: 160704 + 837 = 161541
Step 194: 161541 + 837 = 162378
Step 195: 162378 + 837 = 163215
Step 196: 163215 + 837 = 164052
Step 197: 164052 + 837 = 164889
Step 198: 164889 + 837 = 165726
Step 199: 165726 + 837 = 166563
Step 200: 166563 + 837 = 167400
Step 201: 167400 + 837 = 168237
Step 202: 168237 + 837 = 169074
Step 203: 169074 + 837 = 169911
Step 204: 169911 + 837 = 170748
Step 205: 170748 + 837 = 171585
Step 206: 171585 + 837 = 172422
Step 207: 172422 + 837 = 173259
Step 208: 173259 + 837 = 174096
Step 209: 174096 + 837 = 174933
Step 210: 174933 + 837 = 175770
Step 211: 175770 + 837 = 176607
Step 212: 176607 + 837 = 177444
Step 213: 177444 + 837 = 178281
Step 214: 178281 + 837 = 179118
Step 215: 179118 + 837 = 179955
Step 216: 179955 + 837 = 180792
Step 217: 180792 + 837 = 181629
Step 218: 181629 + 837 = 182466
Step 219: 182466 + 837 = 183303
Step 220: 183303 + 837 = 184140
Step 221: 184140 + 837 = 184977
Step 222: 184977 + 837 = 185814
Step 223: 185814 + 837 = 186651
Step 224: 186651 + 837 = 187488
Step 225: 187488 + 837 = 188325
Step 226: 188325 + 837 = 189162
Step 227: 189162 + 837 = 189999
Step 228: 189999 + 837 = 190836
Step 229: 190836 + 837 = 191673
Step 230: 191673 + 837 = 192510
Step 231: 192510 + 837 = 193347
Step 232: 193347 + 837 = 194184
Step 233: 194184 + 837 = 195021
Step 234: 195021 + 837 = 195858
Step 235: 195858 + 837 = 196695
Step 236: 196695 + 837 = 197532
Step 237: 197532 + 837 = 198369
Step 238: 198369 + 837 = 199206
Step 239: 199206 + 837 = 200043
Step 240: 200043 + 837 = 200880
Step 241: 200880 + 837 = 201717
Step 242: 201717 + 837 = 202554
Step 243: 202554 + 837 = 203391
Step 244: 203391 + 837 = 204228
Step 245: 204228 + 837 = 205065
Step 246: 205065 + 837 = 205902
Step 247: 205902 + 837 = 206739
Step 248: 206739 + 837 = 207576
Step 249: 207576 + 837 = 208413
Step 250: 208413 + 837 = 209250
Step 251: 209250 + 837 = 210087
Step 252: 210087 + 837 = 210924
Step 253: 210924 + 837 = 211761
Step 254: 211761 + 837 = 212598
Step 255: 212598 + 837 = 213435
Step 256: 213435 + 837 = 214272
Step 257: 214272 + 837 = 215109
Step 258: 215109 + 837 = 215946
Step 259: 215946 + 837 = 216783
Step 260: 216783 + 837 = 217620
Step 261: 217620 + 837 = 218457
Step 262: 218457 + 837 = 219294
Step 263: 219294 + 837 = 220131
Step 264: 220131 + 837 = 220968
Step 265: 220968 + 837 = 221805
Step 266: 221805 + 837 = 222642
Step 267: 222642 + 837 = 223479
Step 268: 223479 + 837 = 224316
Step 269: 224316 + 837 = 225153
Step 270: 225153 + 837 = 225990
Step 271: 225990 + 837 = 226827
Step 272: 226827 + 837 = 227664
Step 273: 227664 + 837 = 228501
Step 274: 228501 + 837 = 229338
Step 275: 229338 + 837 = 230175
Step 276: 230175 + 837 = 231012
Step 277: 231012 + 837 = 231849
Step 278: 231849 + 837 = 232686
Step 279: 232686 + 837 = 233523
Step 280: 233523 + 837 = 234360
Step 281: 234360 + 837 = 235197
Step 282: 235197 + 837 = 236034
Step 283: 236034 + 837 = 236871
Step 284: 236871 + 837 = 237708
Step 285: 237708 + 837 = 238545
Step 286: 238545 + 837 = 239382
Step 287: 239382 + 837 = 240219
Step 288: 240219 + 837 = 241056
Step 289: 241056 + 837 = 241893
Step 290: 241893 + 837 = 242730
Step 291: 242730 + 837 = 243567
Step 292: 243567 + 837 = 244404
Step 293: 244404 + 837 = 245241
Step 294: 245241 + 837 = 246078
Step 295: 246078 + 837 = 246915
Step 296: 246915 + 837 = 247752
Step 297: 247752 + 837 = 248589
Step 298: 248589 + 837 = 249426
Step 299: 249426 + 837 = 250263
Step 300: 250263 + 837 = 251100
Step 301: 251100 + 837 = 251937
Step 302: 251937 + 837 = 252774
Step 303: 252774 + 837 = 253611
Step 304: 253611 + 837 = 254448
Step 305: 254448 + 837 = 255285
Step 306: 255285 + 837 = 256122
Step 307: 256122 + 837 = 256959
Step 308: 256959 + 837 = 257796
Step 309: 257796 + 837 = 258633
Step 310: 258633 + 837 = 259470
Step 311: 259470 + 837 = 260307
Step 312: 260307 + 837 = 261144
Step 313: 261144 + 837 = 261981
Step 314: 261981 + 837 = 262818
Step 315: 262818 + 837 = 263655
Step 316: 263655 + 837 = 264492
Step 317: 264492 + 837 = 265329
Step 318: 265329 + 837 = 266166
Step 319: 266166 + 837 = 267003
Step 320: 267003 + 837 = 267840
Step 321: 267840 + 837 = 268677

So, 837*321 = 268677