OK, let's work through this together. We're starting with 833 and we're going to multiply it by 400, which means we add 833 to itself 400 times.
Step 1: 0 + 833 = 833
Step 2: 833 + 833 = 1666
Step 3: 1666 + 833 = 2499
Step 4: 2499 + 833 = 3332
Step 5: 3332 + 833 = 4165
Step 6: 4165 + 833 = 4998
Step 7: 4998 + 833 = 5831
Step 8: 5831 + 833 = 6664
Step 9: 6664 + 833 = 7497
Step 10: 7497 + 833 = 8330
Step 11: 8330 + 833 = 9163
Step 12: 9163 + 833 = 9996
Step 13: 9996 + 833 = 10829
Step 14: 10829 + 833 = 11662
Step 15: 11662 + 833 = 12495
Step 16: 12495 + 833 = 13328
Step 17: 13328 + 833 = 14161
Step 18: 14161 + 833 = 14994
Step 19: 14994 + 833 = 15827
Step 20: 15827 + 833 = 16660
Step 21: 16660 + 833 = 17493
Step 22: 17493 + 833 = 18326
Step 23: 18326 + 833 = 19159
Step 24: 19159 + 833 = 19992
Step 25: 19992 + 833 = 20825
Step 26: 20825 + 833 = 21658
Step 27: 21658 + 833 = 22491
Step 28: 22491 + 833 = 23324
Step 29: 23324 + 833 = 24157
Step 30: 24157 + 833 = 24990
Step 31: 24990 + 833 = 25823
Step 32: 25823 + 833 = 26656
Step 33: 26656 + 833 = 27489
Step 34: 27489 + 833 = 28322
Step 35: 28322 + 833 = 29155
Step 36: 29155 + 833 = 29988
Step 37: 29988 + 833 = 30821
Step 38: 30821 + 833 = 31654
Step 39: 31654 + 833 = 32487
Step 40: 32487 + 833 = 33320
Step 41: 33320 + 833 = 34153
Step 42: 34153 + 833 = 34986
Step 43: 34986 + 833 = 35819
Step 44: 35819 + 833 = 36652
Step 45: 36652 + 833 = 37485
Step 46: 37485 + 833 = 38318
Step 47: 38318 + 833 = 39151
Step 48: 39151 + 833 = 39984
Step 49: 39984 + 833 = 40817
Step 50: 40817 + 833 = 41650
Step 51: 41650 + 833 = 42483
Step 52: 42483 + 833 = 43316
Step 53: 43316 + 833 = 44149
Step 54: 44149 + 833 = 44982
Step 55: 44982 + 833 = 45815
Step 56: 45815 + 833 = 46648
Step 57: 46648 + 833 = 47481
Step 58: 47481 + 833 = 48314
Step 59: 48314 + 833 = 49147
Step 60: 49147 + 833 = 49980
Step 61: 49980 + 833 = 50813
Step 62: 50813 + 833 = 51646
Step 63: 51646 + 833 = 52479
Step 64: 52479 + 833 = 53312
Step 65: 53312 + 833 = 54145
Step 66: 54145 + 833 = 54978
Step 67: 54978 + 833 = 55811
Step 68: 55811 + 833 = 56644
Step 69: 56644 + 833 = 57477
Step 70: 57477 + 833 = 58310
Step 71: 58310 + 833 = 59143
Step 72: 59143 + 833 = 59976
Step 73: 59976 + 833 = 60809
Step 74: 60809 + 833 = 61642
Step 75: 61642 + 833 = 62475
Step 76: 62475 + 833 = 63308
Step 77: 63308 + 833 = 64141
Step 78: 64141 + 833 = 64974
Step 79: 64974 + 833 = 65807
Step 80: 65807 + 833 = 66640
Step 81: 66640 + 833 = 67473
Step 82: 67473 + 833 = 68306
Step 83: 68306 + 833 = 69139
Step 84: 69139 + 833 = 69972
Step 85: 69972 + 833 = 70805
Step 86: 70805 + 833 = 71638
Step 87: 71638 + 833 = 72471
Step 88: 72471 + 833 = 73304
Step 89: 73304 + 833 = 74137
Step 90: 74137 + 833 = 74970
Step 91: 74970 + 833 = 75803
Step 92: 75803 + 833 = 76636
Step 93: 76636 + 833 = 77469
Step 94: 77469 + 833 = 78302
Step 95: 78302 + 833 = 79135
Step 96: 79135 + 833 = 79968
Step 97: 79968 + 833 = 80801
Step 98: 80801 + 833 = 81634
Step 99: 81634 + 833 = 82467
Step 100: 82467 + 833 = 83300
Step 101: 83300 + 833 = 84133
Step 102: 84133 + 833 = 84966
Step 103: 84966 + 833 = 85799
Step 104: 85799 + 833 = 86632
Step 105: 86632 + 833 = 87465
Step 106: 87465 + 833 = 88298
Step 107: 88298 + 833 = 89131
Step 108: 89131 + 833 = 89964
Step 109: 89964 + 833 = 90797
Step 110: 90797 + 833 = 91630
Step 111: 91630 + 833 = 92463
Step 112: 92463 + 833 = 93296
Step 113: 93296 + 833 = 94129
Step 114: 94129 + 833 = 94962
Step 115: 94962 + 833 = 95795
Step 116: 95795 + 833 = 96628
Step 117: 96628 + 833 = 97461
Step 118: 97461 + 833 = 98294
Step 119: 98294 + 833 = 99127
Step 120: 99127 + 833 = 99960
Step 121: 99960 + 833 = 100793
Step 122: 100793 + 833 = 101626
Step 123: 101626 + 833 = 102459
Step 124: 102459 + 833 = 103292
Step 125: 103292 + 833 = 104125
Step 126: 104125 + 833 = 104958
Step 127: 104958 + 833 = 105791
Step 128: 105791 + 833 = 106624
Step 129: 106624 + 833 = 107457
Step 130: 107457 + 833 = 108290
Step 131: 108290 + 833 = 109123
Step 132: 109123 + 833 = 109956
Step 133: 109956 + 833 = 110789
Step 134: 110789 + 833 = 111622
Step 135: 111622 + 833 = 112455
Step 136: 112455 + 833 = 113288
Step 137: 113288 + 833 = 114121
Step 138: 114121 + 833 = 114954
Step 139: 114954 + 833 = 115787
Step 140: 115787 + 833 = 116620
Step 141: 116620 + 833 = 117453
Step 142: 117453 + 833 = 118286
Step 143: 118286 + 833 = 119119
Step 144: 119119 + 833 = 119952
Step 145: 119952 + 833 = 120785
Step 146: 120785 + 833 = 121618
Step 147: 121618 + 833 = 122451
Step 148: 122451 + 833 = 123284
Step 149: 123284 + 833 = 124117
Step 150: 124117 + 833 = 124950
Step 151: 124950 + 833 = 125783
Step 152: 125783 + 833 = 126616
Step 153: 126616 + 833 = 127449
Step 154: 127449 + 833 = 128282
Step 155: 128282 + 833 = 129115
Step 156: 129115 + 833 = 129948
Step 157: 129948 + 833 = 130781
Step 158: 130781 + 833 = 131614
Step 159: 131614 + 833 = 132447
Step 160: 132447 + 833 = 133280
Step 161: 133280 + 833 = 134113
Step 162: 134113 + 833 = 134946
Step 163: 134946 + 833 = 135779
Step 164: 135779 + 833 = 136612
Step 165: 136612 + 833 = 137445
Step 166: 137445 + 833 = 138278
Step 167: 138278 + 833 = 139111
Step 168: 139111 + 833 = 139944
Step 169: 139944 + 833 = 140777
Step 170: 140777 + 833 = 141610
Step 171: 141610 + 833 = 142443
Step 172: 142443 + 833 = 143276
Step 173: 143276 + 833 = 144109
Step 174: 144109 + 833 = 144942
Step 175: 144942 + 833 = 145775
Step 176: 145775 + 833 = 146608
Step 177: 146608 + 833 = 147441
Step 178: 147441 + 833 = 148274
Step 179: 148274 + 833 = 149107
Step 180: 149107 + 833 = 149940
Step 181: 149940 + 833 = 150773
Step 182: 150773 + 833 = 151606
Step 183: 151606 + 833 = 152439
Step 184: 152439 + 833 = 153272
Step 185: 153272 + 833 = 154105
Step 186: 154105 + 833 = 154938
Step 187: 154938 + 833 = 155771
Step 188: 155771 + 833 = 156604
Step 189: 156604 + 833 = 157437
Step 190: 157437 + 833 = 158270
Step 191: 158270 + 833 = 159103
Step 192: 159103 + 833 = 159936
Step 193: 159936 + 833 = 160769
Step 194: 160769 + 833 = 161602
Step 195: 161602 + 833 = 162435
Step 196: 162435 + 833 = 163268
Step 197: 163268 + 833 = 164101
Step 198: 164101 + 833 = 164934
Step 199: 164934 + 833 = 165767
Step 200: 165767 + 833 = 166600
Step 201: 166600 + 833 = 167433
Step 202: 167433 + 833 = 168266
Step 203: 168266 + 833 = 169099
Step 204: 169099 + 833 = 169932
Step 205: 169932 + 833 = 170765
Step 206: 170765 + 833 = 171598
Step 207: 171598 + 833 = 172431
Step 208: 172431 + 833 = 173264
Step 209: 173264 + 833 = 174097
Step 210: 174097 + 833 = 174930
Step 211: 174930 + 833 = 175763
Step 212: 175763 + 833 = 176596
Step 213: 176596 + 833 = 177429
Step 214: 177429 + 833 = 178262
Step 215: 178262 + 833 = 179095
Step 216: 179095 + 833 = 179928
Step 217: 179928 + 833 = 180761
Step 218: 180761 + 833 = 181594
Step 219: 181594 + 833 = 182427
Step 220: 182427 + 833 = 183260
Step 221: 183260 + 833 = 184093
Step 222: 184093 + 833 = 184926
Step 223: 184926 + 833 = 185759
Step 224: 185759 + 833 = 186592
Step 225: 186592 + 833 = 187425
Step 226: 187425 + 833 = 188258
Step 227: 188258 + 833 = 189091
Step 228: 189091 + 833 = 189924
Step 229: 189924 + 833 = 190757
Step 230: 190757 + 833 = 191590
Step 231: 191590 + 833 = 192423
Step 232: 192423 + 833 = 193256
Step 233: 193256 + 833 = 194089
Step 234: 194089 + 833 = 194922
Step 235: 194922 + 833 = 195755
Step 236: 195755 + 833 = 196588
Step 237: 196588 + 833 = 197421
Step 238: 197421 + 833 = 198254
Step 239: 198254 + 833 = 199087
Step 240: 199087 + 833 = 199920
Step 241: 199920 + 833 = 200753
Step 242: 200753 + 833 = 201586
Step 243: 201586 + 833 = 202419
Step 244: 202419 + 833 = 203252
Step 245: 203252 + 833 = 204085
Step 246: 204085 + 833 = 204918
Step 247: 204918 + 833 = 205751
Step 248: 205751 + 833 = 206584
Step 249: 206584 + 833 = 207417
Step 250: 207417 + 833 = 208250
Step 251: 208250 + 833 = 209083
Step 252: 209083 + 833 = 209916
Step 253: 209916 + 833 = 210749
Step 254: 210749 + 833 = 211582
Step 255: 211582 + 833 = 212415
Step 256: 212415 + 833 = 213248
Step 257: 213248 + 833 = 214081
Step 258: 214081 + 833 = 214914
Step 259: 214914 + 833 = 215747
Step 260: 215747 + 833 = 216580
Step 261: 216580 + 833 = 217413
Step 262: 217413 + 833 = 218246
Step 263: 218246 + 833 = 219079
Step 264: 219079 + 833 = 219912
Step 265: 219912 + 833 = 220745
Step 266: 220745 + 833 = 221578
Step 267: 221578 + 833 = 222411
Step 268: 222411 + 833 = 223244
Step 269: 223244 + 833 = 224077
Step 270: 224077 + 833 = 224910
Step 271: 224910 + 833 = 225743
Step 272: 225743 + 833 = 226576
Step 273: 226576 + 833 = 227409
Step 274: 227409 + 833 = 228242
Step 275: 228242 + 833 = 229075
Step 276: 229075 + 833 = 229908
Step 277: 229908 + 833 = 230741
Step 278: 230741 + 833 = 231574
Step 279: 231574 + 833 = 232407
Step 280: 232407 + 833 = 233240
Step 281: 233240 + 833 = 234073
Step 282: 234073 + 833 = 234906
Step 283: 234906 + 833 = 235739
Step 284: 235739 + 833 = 236572
Step 285: 236572 + 833 = 237405
Step 286: 237405 + 833 = 238238
Step 287: 238238 + 833 = 239071
Step 288: 239071 + 833 = 239904
Step 289: 239904 + 833 = 240737
Step 290: 240737 + 833 = 241570
Step 291: 241570 + 833 = 242403
Step 292: 242403 + 833 = 243236
Step 293: 243236 + 833 = 244069
Step 294: 244069 + 833 = 244902
Step 295: 244902 + 833 = 245735
Step 296: 245735 + 833 = 246568
Step 297: 246568 + 833 = 247401
Step 298: 247401 + 833 = 248234
Step 299: 248234 + 833 = 249067
Step 300: 249067 + 833 = 249900
Step 301: 249900 + 833 = 250733
Step 302: 250733 + 833 = 251566
Step 303: 251566 + 833 = 252399
Step 304: 252399 + 833 = 253232
Step 305: 253232 + 833 = 254065
Step 306: 254065 + 833 = 254898
Step 307: 254898 + 833 = 255731
Step 308: 255731 + 833 = 256564
Step 309: 256564 + 833 = 257397
Step 310: 257397 + 833 = 258230
Step 311: 258230 + 833 = 259063
Step 312: 259063 + 833 = 259896
Step 313: 259896 + 833 = 260729
Step 314: 260729 + 833 = 261562
Step 315: 261562 + 833 = 262395
Step 316: 262395 + 833 = 263228
Step 317: 263228 + 833 = 264061
Step 318: 264061 + 833 = 264894
Step 319: 264894 + 833 = 265727
Step 320: 265727 + 833 = 266560
Step 321: 266560 + 833 = 267393
Step 322: 267393 + 833 = 268226
Step 323: 268226 + 833 = 269059
Step 324: 269059 + 833 = 269892
Step 325: 269892 + 833 = 270725
Step 326: 270725 + 833 = 271558
Step 327: 271558 + 833 = 272391
Step 328: 272391 + 833 = 273224
Step 329: 273224 + 833 = 274057
Step 330: 274057 + 833 = 274890
Step 331: 274890 + 833 = 275723
Step 332: 275723 + 833 = 276556
Step 333: 276556 + 833 = 277389
Step 334: 277389 + 833 = 278222
Step 335: 278222 + 833 = 279055
Step 336: 279055 + 833 = 279888
Step 337: 279888 + 833 = 280721
Step 338: 280721 + 833 = 281554
Step 339: 281554 + 833 = 282387
Step 340: 282387 + 833 = 283220
Step 341: 283220 + 833 = 284053
Step 342: 284053 + 833 = 284886
Step 343: 284886 + 833 = 285719
Step 344: 285719 + 833 = 286552
Step 345: 286552 + 833 = 287385
Step 346: 287385 + 833 = 288218
Step 347: 288218 + 833 = 289051
Step 348: 289051 + 833 = 289884
Step 349: 289884 + 833 = 290717
Step 350: 290717 + 833 = 291550
Step 351: 291550 + 833 = 292383
Step 352: 292383 + 833 = 293216
Step 353: 293216 + 833 = 294049
Step 354: 294049 + 833 = 294882
Step 355: 294882 + 833 = 295715
Step 356: 295715 + 833 = 296548
Step 357: 296548 + 833 = 297381
Step 358: 297381 + 833 = 298214
Step 359: 298214 + 833 = 299047
Step 360: 299047 + 833 = 299880
Step 361: 299880 + 833 = 300713
Step 362: 300713 + 833 = 301546
Step 363: 301546 + 833 = 302379
Step 364: 302379 + 833 = 303212
Step 365: 303212 + 833 = 304045
Step 366: 304045 + 833 = 304878
Step 367: 304878 + 833 = 305711
Step 368: 305711 + 833 = 306544
Step 369: 306544 + 833 = 307377
Step 370: 307377 + 833 = 308210
Step 371: 308210 + 833 = 309043
Step 372: 309043 + 833 = 309876
Step 373: 309876 + 833 = 310709
Step 374: 310709 + 833 = 311542
Step 375: 311542 + 833 = 312375
Step 376: 312375 + 833 = 313208
Step 377: 313208 + 833 = 314041
Step 378: 314041 + 833 = 314874
Step 379: 314874 + 833 = 315707
Step 380: 315707 + 833 = 316540
Step 381: 316540 + 833 = 317373
Step 382: 317373 + 833 = 318206
Step 383: 318206 + 833 = 319039
Step 384: 319039 + 833 = 319872
Step 385: 319872 + 833 = 320705
Step 386: 320705 + 833 = 321538
Step 387: 321538 + 833 = 322371
Step 388: 322371 + 833 = 323204
Step 389: 323204 + 833 = 324037
Step 390: 324037 + 833 = 324870
Step 391: 324870 + 833 = 325703
Step 392: 325703 + 833 = 326536
Step 393: 326536 + 833 = 327369
Step 394: 327369 + 833 = 328202
Step 395: 328202 + 833 = 329035
Step 396: 329035 + 833 = 329868
Step 397: 329868 + 833 = 330701
Step 398: 330701 + 833 = 331534
Step 399: 331534 + 833 = 332367
Step 400: 332367 + 833 = 333200

So, 833*400 = 333200