Alright, let's solve this math problem step by step. First, we have the number 813. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 378. So, we're going to take the number 813 and add it to itself 378 times.
Step 1: 0 + 813 = 813
Step 2: 813 + 813 = 1626
Step 3: 1626 + 813 = 2439
Step 4: 2439 + 813 = 3252
Step 5: 3252 + 813 = 4065
Step 6: 4065 + 813 = 4878
Step 7: 4878 + 813 = 5691
Step 8: 5691 + 813 = 6504
Step 9: 6504 + 813 = 7317
Step 10: 7317 + 813 = 8130
Step 11: 8130 + 813 = 8943
Step 12: 8943 + 813 = 9756
Step 13: 9756 + 813 = 10569
Step 14: 10569 + 813 = 11382
Step 15: 11382 + 813 = 12195
Step 16: 12195 + 813 = 13008
Step 17: 13008 + 813 = 13821
Step 18: 13821 + 813 = 14634
Step 19: 14634 + 813 = 15447
Step 20: 15447 + 813 = 16260
Step 21: 16260 + 813 = 17073
Step 22: 17073 + 813 = 17886
Step 23: 17886 + 813 = 18699
Step 24: 18699 + 813 = 19512
Step 25: 19512 + 813 = 20325
Step 26: 20325 + 813 = 21138
Step 27: 21138 + 813 = 21951
Step 28: 21951 + 813 = 22764
Step 29: 22764 + 813 = 23577
Step 30: 23577 + 813 = 24390
Step 31: 24390 + 813 = 25203
Step 32: 25203 + 813 = 26016
Step 33: 26016 + 813 = 26829
Step 34: 26829 + 813 = 27642
Step 35: 27642 + 813 = 28455
Step 36: 28455 + 813 = 29268
Step 37: 29268 + 813 = 30081
Step 38: 30081 + 813 = 30894
Step 39: 30894 + 813 = 31707
Step 40: 31707 + 813 = 32520
Step 41: 32520 + 813 = 33333
Step 42: 33333 + 813 = 34146
Step 43: 34146 + 813 = 34959
Step 44: 34959 + 813 = 35772
Step 45: 35772 + 813 = 36585
Step 46: 36585 + 813 = 37398
Step 47: 37398 + 813 = 38211
Step 48: 38211 + 813 = 39024
Step 49: 39024 + 813 = 39837
Step 50: 39837 + 813 = 40650
Step 51: 40650 + 813 = 41463
Step 52: 41463 + 813 = 42276
Step 53: 42276 + 813 = 43089
Step 54: 43089 + 813 = 43902
Step 55: 43902 + 813 = 44715
Step 56: 44715 + 813 = 45528
Step 57: 45528 + 813 = 46341
Step 58: 46341 + 813 = 47154
Step 59: 47154 + 813 = 47967
Step 60: 47967 + 813 = 48780
Step 61: 48780 + 813 = 49593
Step 62: 49593 + 813 = 50406
Step 63: 50406 + 813 = 51219
Step 64: 51219 + 813 = 52032
Step 65: 52032 + 813 = 52845
Step 66: 52845 + 813 = 53658
Step 67: 53658 + 813 = 54471
Step 68: 54471 + 813 = 55284
Step 69: 55284 + 813 = 56097
Step 70: 56097 + 813 = 56910
Step 71: 56910 + 813 = 57723
Step 72: 57723 + 813 = 58536
Step 73: 58536 + 813 = 59349
Step 74: 59349 + 813 = 60162
Step 75: 60162 + 813 = 60975
Step 76: 60975 + 813 = 61788
Step 77: 61788 + 813 = 62601
Step 78: 62601 + 813 = 63414
Step 79: 63414 + 813 = 64227
Step 80: 64227 + 813 = 65040
Step 81: 65040 + 813 = 65853
Step 82: 65853 + 813 = 66666
Step 83: 66666 + 813 = 67479
Step 84: 67479 + 813 = 68292
Step 85: 68292 + 813 = 69105
Step 86: 69105 + 813 = 69918
Step 87: 69918 + 813 = 70731
Step 88: 70731 + 813 = 71544
Step 89: 71544 + 813 = 72357
Step 90: 72357 + 813 = 73170
Step 91: 73170 + 813 = 73983
Step 92: 73983 + 813 = 74796
Step 93: 74796 + 813 = 75609
Step 94: 75609 + 813 = 76422
Step 95: 76422 + 813 = 77235
Step 96: 77235 + 813 = 78048
Step 97: 78048 + 813 = 78861
Step 98: 78861 + 813 = 79674
Step 99: 79674 + 813 = 80487
Step 100: 80487 + 813 = 81300
Step 101: 81300 + 813 = 82113
Step 102: 82113 + 813 = 82926
Step 103: 82926 + 813 = 83739
Step 104: 83739 + 813 = 84552
Step 105: 84552 + 813 = 85365
Step 106: 85365 + 813 = 86178
Step 107: 86178 + 813 = 86991
Step 108: 86991 + 813 = 87804
Step 109: 87804 + 813 = 88617
Step 110: 88617 + 813 = 89430
Step 111: 89430 + 813 = 90243
Step 112: 90243 + 813 = 91056
Step 113: 91056 + 813 = 91869
Step 114: 91869 + 813 = 92682
Step 115: 92682 + 813 = 93495
Step 116: 93495 + 813 = 94308
Step 117: 94308 + 813 = 95121
Step 118: 95121 + 813 = 95934
Step 119: 95934 + 813 = 96747
Step 120: 96747 + 813 = 97560
Step 121: 97560 + 813 = 98373
Step 122: 98373 + 813 = 99186
Step 123: 99186 + 813 = 99999
Step 124: 99999 + 813 = 100812
Step 125: 100812 + 813 = 101625
Step 126: 101625 + 813 = 102438
Step 127: 102438 + 813 = 103251
Step 128: 103251 + 813 = 104064
Step 129: 104064 + 813 = 104877
Step 130: 104877 + 813 = 105690
Step 131: 105690 + 813 = 106503
Step 132: 106503 + 813 = 107316
Step 133: 107316 + 813 = 108129
Step 134: 108129 + 813 = 108942
Step 135: 108942 + 813 = 109755
Step 136: 109755 + 813 = 110568
Step 137: 110568 + 813 = 111381
Step 138: 111381 + 813 = 112194
Step 139: 112194 + 813 = 113007
Step 140: 113007 + 813 = 113820
Step 141: 113820 + 813 = 114633
Step 142: 114633 + 813 = 115446
Step 143: 115446 + 813 = 116259
Step 144: 116259 + 813 = 117072
Step 145: 117072 + 813 = 117885
Step 146: 117885 + 813 = 118698
Step 147: 118698 + 813 = 119511
Step 148: 119511 + 813 = 120324
Step 149: 120324 + 813 = 121137
Step 150: 121137 + 813 = 121950
Step 151: 121950 + 813 = 122763
Step 152: 122763 + 813 = 123576
Step 153: 123576 + 813 = 124389
Step 154: 124389 + 813 = 125202
Step 155: 125202 + 813 = 126015
Step 156: 126015 + 813 = 126828
Step 157: 126828 + 813 = 127641
Step 158: 127641 + 813 = 128454
Step 159: 128454 + 813 = 129267
Step 160: 129267 + 813 = 130080
Step 161: 130080 + 813 = 130893
Step 162: 130893 + 813 = 131706
Step 163: 131706 + 813 = 132519
Step 164: 132519 + 813 = 133332
Step 165: 133332 + 813 = 134145
Step 166: 134145 + 813 = 134958
Step 167: 134958 + 813 = 135771
Step 168: 135771 + 813 = 136584
Step 169: 136584 + 813 = 137397
Step 170: 137397 + 813 = 138210
Step 171: 138210 + 813 = 139023
Step 172: 139023 + 813 = 139836
Step 173: 139836 + 813 = 140649
Step 174: 140649 + 813 = 141462
Step 175: 141462 + 813 = 142275
Step 176: 142275 + 813 = 143088
Step 177: 143088 + 813 = 143901
Step 178: 143901 + 813 = 144714
Step 179: 144714 + 813 = 145527
Step 180: 145527 + 813 = 146340
Step 181: 146340 + 813 = 147153
Step 182: 147153 + 813 = 147966
Step 183: 147966 + 813 = 148779
Step 184: 148779 + 813 = 149592
Step 185: 149592 + 813 = 150405
Step 186: 150405 + 813 = 151218
Step 187: 151218 + 813 = 152031
Step 188: 152031 + 813 = 152844
Step 189: 152844 + 813 = 153657
Step 190: 153657 + 813 = 154470
Step 191: 154470 + 813 = 155283
Step 192: 155283 + 813 = 156096
Step 193: 156096 + 813 = 156909
Step 194: 156909 + 813 = 157722
Step 195: 157722 + 813 = 158535
Step 196: 158535 + 813 = 159348
Step 197: 159348 + 813 = 160161
Step 198: 160161 + 813 = 160974
Step 199: 160974 + 813 = 161787
Step 200: 161787 + 813 = 162600
Step 201: 162600 + 813 = 163413
Step 202: 163413 + 813 = 164226
Step 203: 164226 + 813 = 165039
Step 204: 165039 + 813 = 165852
Step 205: 165852 + 813 = 166665
Step 206: 166665 + 813 = 167478
Step 207: 167478 + 813 = 168291
Step 208: 168291 + 813 = 169104
Step 209: 169104 + 813 = 169917
Step 210: 169917 + 813 = 170730
Step 211: 170730 + 813 = 171543
Step 212: 171543 + 813 = 172356
Step 213: 172356 + 813 = 173169
Step 214: 173169 + 813 = 173982
Step 215: 173982 + 813 = 174795
Step 216: 174795 + 813 = 175608
Step 217: 175608 + 813 = 176421
Step 218: 176421 + 813 = 177234
Step 219: 177234 + 813 = 178047
Step 220: 178047 + 813 = 178860
Step 221: 178860 + 813 = 179673
Step 222: 179673 + 813 = 180486
Step 223: 180486 + 813 = 181299
Step 224: 181299 + 813 = 182112
Step 225: 182112 + 813 = 182925
Step 226: 182925 + 813 = 183738
Step 227: 183738 + 813 = 184551
Step 228: 184551 + 813 = 185364
Step 229: 185364 + 813 = 186177
Step 230: 186177 + 813 = 186990
Step 231: 186990 + 813 = 187803
Step 232: 187803 + 813 = 188616
Step 233: 188616 + 813 = 189429
Step 234: 189429 + 813 = 190242
Step 235: 190242 + 813 = 191055
Step 236: 191055 + 813 = 191868
Step 237: 191868 + 813 = 192681
Step 238: 192681 + 813 = 193494
Step 239: 193494 + 813 = 194307
Step 240: 194307 + 813 = 195120
Step 241: 195120 + 813 = 195933
Step 242: 195933 + 813 = 196746
Step 243: 196746 + 813 = 197559
Step 244: 197559 + 813 = 198372
Step 245: 198372 + 813 = 199185
Step 246: 199185 + 813 = 199998
Step 247: 199998 + 813 = 200811
Step 248: 200811 + 813 = 201624
Step 249: 201624 + 813 = 202437
Step 250: 202437 + 813 = 203250
Step 251: 203250 + 813 = 204063
Step 252: 204063 + 813 = 204876
Step 253: 204876 + 813 = 205689
Step 254: 205689 + 813 = 206502
Step 255: 206502 + 813 = 207315
Step 256: 207315 + 813 = 208128
Step 257: 208128 + 813 = 208941
Step 258: 208941 + 813 = 209754
Step 259: 209754 + 813 = 210567
Step 260: 210567 + 813 = 211380
Step 261: 211380 + 813 = 212193
Step 262: 212193 + 813 = 213006
Step 263: 213006 + 813 = 213819
Step 264: 213819 + 813 = 214632
Step 265: 214632 + 813 = 215445
Step 266: 215445 + 813 = 216258
Step 267: 216258 + 813 = 217071
Step 268: 217071 + 813 = 217884
Step 269: 217884 + 813 = 218697
Step 270: 218697 + 813 = 219510
Step 271: 219510 + 813 = 220323
Step 272: 220323 + 813 = 221136
Step 273: 221136 + 813 = 221949
Step 274: 221949 + 813 = 222762
Step 275: 222762 + 813 = 223575
Step 276: 223575 + 813 = 224388
Step 277: 224388 + 813 = 225201
Step 278: 225201 + 813 = 226014
Step 279: 226014 + 813 = 226827
Step 280: 226827 + 813 = 227640
Step 281: 227640 + 813 = 228453
Step 282: 228453 + 813 = 229266
Step 283: 229266 + 813 = 230079
Step 284: 230079 + 813 = 230892
Step 285: 230892 + 813 = 231705
Step 286: 231705 + 813 = 232518
Step 287: 232518 + 813 = 233331
Step 288: 233331 + 813 = 234144
Step 289: 234144 + 813 = 234957
Step 290: 234957 + 813 = 235770
Step 291: 235770 + 813 = 236583
Step 292: 236583 + 813 = 237396
Step 293: 237396 + 813 = 238209
Step 294: 238209 + 813 = 239022
Step 295: 239022 + 813 = 239835
Step 296: 239835 + 813 = 240648
Step 297: 240648 + 813 = 241461
Step 298: 241461 + 813 = 242274
Step 299: 242274 + 813 = 243087
Step 300: 243087 + 813 = 243900
Step 301: 243900 + 813 = 244713
Step 302: 244713 + 813 = 245526
Step 303: 245526 + 813 = 246339
Step 304: 246339 + 813 = 247152
Step 305: 247152 + 813 = 247965
Step 306: 247965 + 813 = 248778
Step 307: 248778 + 813 = 249591
Step 308: 249591 + 813 = 250404
Step 309: 250404 + 813 = 251217
Step 310: 251217 + 813 = 252030
Step 311: 252030 + 813 = 252843
Step 312: 252843 + 813 = 253656
Step 313: 253656 + 813 = 254469
Step 314: 254469 + 813 = 255282
Step 315: 255282 + 813 = 256095
Step 316: 256095 + 813 = 256908
Step 317: 256908 + 813 = 257721
Step 318: 257721 + 813 = 258534
Step 319: 258534 + 813 = 259347
Step 320: 259347 + 813 = 260160
Step 321: 260160 + 813 = 260973
Step 322: 260973 + 813 = 261786
Step 323: 261786 + 813 = 262599
Step 324: 262599 + 813 = 263412
Step 325: 263412 + 813 = 264225
Step 326: 264225 + 813 = 265038
Step 327: 265038 + 813 = 265851
Step 328: 265851 + 813 = 266664
Step 329: 266664 + 813 = 267477
Step 330: 267477 + 813 = 268290
Step 331: 268290 + 813 = 269103
Step 332: 269103 + 813 = 269916
Step 333: 269916 + 813 = 270729
Step 334: 270729 + 813 = 271542
Step 335: 271542 + 813 = 272355
Step 336: 272355 + 813 = 273168
Step 337: 273168 + 813 = 273981
Step 338: 273981 + 813 = 274794
Step 339: 274794 + 813 = 275607
Step 340: 275607 + 813 = 276420
Step 341: 276420 + 813 = 277233
Step 342: 277233 + 813 = 278046
Step 343: 278046 + 813 = 278859
Step 344: 278859 + 813 = 279672
Step 345: 279672 + 813 = 280485
Step 346: 280485 + 813 = 281298
Step 347: 281298 + 813 = 282111
Step 348: 282111 + 813 = 282924
Step 349: 282924 + 813 = 283737
Step 350: 283737 + 813 = 284550
Step 351: 284550 + 813 = 285363
Step 352: 285363 + 813 = 286176
Step 353: 286176 + 813 = 286989
Step 354: 286989 + 813 = 287802
Step 355: 287802 + 813 = 288615
Step 356: 288615 + 813 = 289428
Step 357: 289428 + 813 = 290241
Step 358: 290241 + 813 = 291054
Step 359: 291054 + 813 = 291867
Step 360: 291867 + 813 = 292680
Step 361: 292680 + 813 = 293493
Step 362: 293493 + 813 = 294306
Step 363: 294306 + 813 = 295119
Step 364: 295119 + 813 = 295932
Step 365: 295932 + 813 = 296745
Step 366: 296745 + 813 = 297558
Step 367: 297558 + 813 = 298371
Step 368: 298371 + 813 = 299184
Step 369: 299184 + 813 = 299997
Step 370: 299997 + 813 = 300810
Step 371: 300810 + 813 = 301623
Step 372: 301623 + 813 = 302436
Step 373: 302436 + 813 = 303249
Step 374: 303249 + 813 = 304062
Step 375: 304062 + 813 = 304875
Step 376: 304875 + 813 = 305688
Step 377: 305688 + 813 = 306501
Step 378: 306501 + 813 = 307314

So, 813*378 = 307314