Let's get this math done. We have 878 and we're going to multiply it by 394. This is the same as taking 878 and adding it to itself 394 times.
Step 1: 0 + 878 = 878
Step 2: 878 + 878 = 1756
Step 3: 1756 + 878 = 2634
Step 4: 2634 + 878 = 3512
Step 5: 3512 + 878 = 4390
Step 6: 4390 + 878 = 5268
Step 7: 5268 + 878 = 6146
Step 8: 6146 + 878 = 7024
Step 9: 7024 + 878 = 7902
Step 10: 7902 + 878 = 8780
Step 11: 8780 + 878 = 9658
Step 12: 9658 + 878 = 10536
Step 13: 10536 + 878 = 11414
Step 14: 11414 + 878 = 12292
Step 15: 12292 + 878 = 13170
Step 16: 13170 + 878 = 14048
Step 17: 14048 + 878 = 14926
Step 18: 14926 + 878 = 15804
Step 19: 15804 + 878 = 16682
Step 20: 16682 + 878 = 17560
Step 21: 17560 + 878 = 18438
Step 22: 18438 + 878 = 19316
Step 23: 19316 + 878 = 20194
Step 24: 20194 + 878 = 21072
Step 25: 21072 + 878 = 21950
Step 26: 21950 + 878 = 22828
Step 27: 22828 + 878 = 23706
Step 28: 23706 + 878 = 24584
Step 29: 24584 + 878 = 25462
Step 30: 25462 + 878 = 26340
Step 31: 26340 + 878 = 27218
Step 32: 27218 + 878 = 28096
Step 33: 28096 + 878 = 28974
Step 34: 28974 + 878 = 29852
Step 35: 29852 + 878 = 30730
Step 36: 30730 + 878 = 31608
Step 37: 31608 + 878 = 32486
Step 38: 32486 + 878 = 33364
Step 39: 33364 + 878 = 34242
Step 40: 34242 + 878 = 35120
Step 41: 35120 + 878 = 35998
Step 42: 35998 + 878 = 36876
Step 43: 36876 + 878 = 37754
Step 44: 37754 + 878 = 38632
Step 45: 38632 + 878 = 39510
Step 46: 39510 + 878 = 40388
Step 47: 40388 + 878 = 41266
Step 48: 41266 + 878 = 42144
Step 49: 42144 + 878 = 43022
Step 50: 43022 + 878 = 43900
Step 51: 43900 + 878 = 44778
Step 52: 44778 + 878 = 45656
Step 53: 45656 + 878 = 46534
Step 54: 46534 + 878 = 47412
Step 55: 47412 + 878 = 48290
Step 56: 48290 + 878 = 49168
Step 57: 49168 + 878 = 50046
Step 58: 50046 + 878 = 50924
Step 59: 50924 + 878 = 51802
Step 60: 51802 + 878 = 52680
Step 61: 52680 + 878 = 53558
Step 62: 53558 + 878 = 54436
Step 63: 54436 + 878 = 55314
Step 64: 55314 + 878 = 56192
Step 65: 56192 + 878 = 57070
Step 66: 57070 + 878 = 57948
Step 67: 57948 + 878 = 58826
Step 68: 58826 + 878 = 59704
Step 69: 59704 + 878 = 60582
Step 70: 60582 + 878 = 61460
Step 71: 61460 + 878 = 62338
Step 72: 62338 + 878 = 63216
Step 73: 63216 + 878 = 64094
Step 74: 64094 + 878 = 64972
Step 75: 64972 + 878 = 65850
Step 76: 65850 + 878 = 66728
Step 77: 66728 + 878 = 67606
Step 78: 67606 + 878 = 68484
Step 79: 68484 + 878 = 69362
Step 80: 69362 + 878 = 70240
Step 81: 70240 + 878 = 71118
Step 82: 71118 + 878 = 71996
Step 83: 71996 + 878 = 72874
Step 84: 72874 + 878 = 73752
Step 85: 73752 + 878 = 74630
Step 86: 74630 + 878 = 75508
Step 87: 75508 + 878 = 76386
Step 88: 76386 + 878 = 77264
Step 89: 77264 + 878 = 78142
Step 90: 78142 + 878 = 79020
Step 91: 79020 + 878 = 79898
Step 92: 79898 + 878 = 80776
Step 93: 80776 + 878 = 81654
Step 94: 81654 + 878 = 82532
Step 95: 82532 + 878 = 83410
Step 96: 83410 + 878 = 84288
Step 97: 84288 + 878 = 85166
Step 98: 85166 + 878 = 86044
Step 99: 86044 + 878 = 86922
Step 100: 86922 + 878 = 87800
Step 101: 87800 + 878 = 88678
Step 102: 88678 + 878 = 89556
Step 103: 89556 + 878 = 90434
Step 104: 90434 + 878 = 91312
Step 105: 91312 + 878 = 92190
Step 106: 92190 + 878 = 93068
Step 107: 93068 + 878 = 93946
Step 108: 93946 + 878 = 94824
Step 109: 94824 + 878 = 95702
Step 110: 95702 + 878 = 96580
Step 111: 96580 + 878 = 97458
Step 112: 97458 + 878 = 98336
Step 113: 98336 + 878 = 99214
Step 114: 99214 + 878 = 100092
Step 115: 100092 + 878 = 100970
Step 116: 100970 + 878 = 101848
Step 117: 101848 + 878 = 102726
Step 118: 102726 + 878 = 103604
Step 119: 103604 + 878 = 104482
Step 120: 104482 + 878 = 105360
Step 121: 105360 + 878 = 106238
Step 122: 106238 + 878 = 107116
Step 123: 107116 + 878 = 107994
Step 124: 107994 + 878 = 108872
Step 125: 108872 + 878 = 109750
Step 126: 109750 + 878 = 110628
Step 127: 110628 + 878 = 111506
Step 128: 111506 + 878 = 112384
Step 129: 112384 + 878 = 113262
Step 130: 113262 + 878 = 114140
Step 131: 114140 + 878 = 115018
Step 132: 115018 + 878 = 115896
Step 133: 115896 + 878 = 116774
Step 134: 116774 + 878 = 117652
Step 135: 117652 + 878 = 118530
Step 136: 118530 + 878 = 119408
Step 137: 119408 + 878 = 120286
Step 138: 120286 + 878 = 121164
Step 139: 121164 + 878 = 122042
Step 140: 122042 + 878 = 122920
Step 141: 122920 + 878 = 123798
Step 142: 123798 + 878 = 124676
Step 143: 124676 + 878 = 125554
Step 144: 125554 + 878 = 126432
Step 145: 126432 + 878 = 127310
Step 146: 127310 + 878 = 128188
Step 147: 128188 + 878 = 129066
Step 148: 129066 + 878 = 129944
Step 149: 129944 + 878 = 130822
Step 150: 130822 + 878 = 131700
Step 151: 131700 + 878 = 132578
Step 152: 132578 + 878 = 133456
Step 153: 133456 + 878 = 134334
Step 154: 134334 + 878 = 135212
Step 155: 135212 + 878 = 136090
Step 156: 136090 + 878 = 136968
Step 157: 136968 + 878 = 137846
Step 158: 137846 + 878 = 138724
Step 159: 138724 + 878 = 139602
Step 160: 139602 + 878 = 140480
Step 161: 140480 + 878 = 141358
Step 162: 141358 + 878 = 142236
Step 163: 142236 + 878 = 143114
Step 164: 143114 + 878 = 143992
Step 165: 143992 + 878 = 144870
Step 166: 144870 + 878 = 145748
Step 167: 145748 + 878 = 146626
Step 168: 146626 + 878 = 147504
Step 169: 147504 + 878 = 148382
Step 170: 148382 + 878 = 149260
Step 171: 149260 + 878 = 150138
Step 172: 150138 + 878 = 151016
Step 173: 151016 + 878 = 151894
Step 174: 151894 + 878 = 152772
Step 175: 152772 + 878 = 153650
Step 176: 153650 + 878 = 154528
Step 177: 154528 + 878 = 155406
Step 178: 155406 + 878 = 156284
Step 179: 156284 + 878 = 157162
Step 180: 157162 + 878 = 158040
Step 181: 158040 + 878 = 158918
Step 182: 158918 + 878 = 159796
Step 183: 159796 + 878 = 160674
Step 184: 160674 + 878 = 161552
Step 185: 161552 + 878 = 162430
Step 186: 162430 + 878 = 163308
Step 187: 163308 + 878 = 164186
Step 188: 164186 + 878 = 165064
Step 189: 165064 + 878 = 165942
Step 190: 165942 + 878 = 166820
Step 191: 166820 + 878 = 167698
Step 192: 167698 + 878 = 168576
Step 193: 168576 + 878 = 169454
Step 194: 169454 + 878 = 170332
Step 195: 170332 + 878 = 171210
Step 196: 171210 + 878 = 172088
Step 197: 172088 + 878 = 172966
Step 198: 172966 + 878 = 173844
Step 199: 173844 + 878 = 174722
Step 200: 174722 + 878 = 175600
Step 201: 175600 + 878 = 176478
Step 202: 176478 + 878 = 177356
Step 203: 177356 + 878 = 178234
Step 204: 178234 + 878 = 179112
Step 205: 179112 + 878 = 179990
Step 206: 179990 + 878 = 180868
Step 207: 180868 + 878 = 181746
Step 208: 181746 + 878 = 182624
Step 209: 182624 + 878 = 183502
Step 210: 183502 + 878 = 184380
Step 211: 184380 + 878 = 185258
Step 212: 185258 + 878 = 186136
Step 213: 186136 + 878 = 187014
Step 214: 187014 + 878 = 187892
Step 215: 187892 + 878 = 188770
Step 216: 188770 + 878 = 189648
Step 217: 189648 + 878 = 190526
Step 218: 190526 + 878 = 191404
Step 219: 191404 + 878 = 192282
Step 220: 192282 + 878 = 193160
Step 221: 193160 + 878 = 194038
Step 222: 194038 + 878 = 194916
Step 223: 194916 + 878 = 195794
Step 224: 195794 + 878 = 196672
Step 225: 196672 + 878 = 197550
Step 226: 197550 + 878 = 198428
Step 227: 198428 + 878 = 199306
Step 228: 199306 + 878 = 200184
Step 229: 200184 + 878 = 201062
Step 230: 201062 + 878 = 201940
Step 231: 201940 + 878 = 202818
Step 232: 202818 + 878 = 203696
Step 233: 203696 + 878 = 204574
Step 234: 204574 + 878 = 205452
Step 235: 205452 + 878 = 206330
Step 236: 206330 + 878 = 207208
Step 237: 207208 + 878 = 208086
Step 238: 208086 + 878 = 208964
Step 239: 208964 + 878 = 209842
Step 240: 209842 + 878 = 210720
Step 241: 210720 + 878 = 211598
Step 242: 211598 + 878 = 212476
Step 243: 212476 + 878 = 213354
Step 244: 213354 + 878 = 214232
Step 245: 214232 + 878 = 215110
Step 246: 215110 + 878 = 215988
Step 247: 215988 + 878 = 216866
Step 248: 216866 + 878 = 217744
Step 249: 217744 + 878 = 218622
Step 250: 218622 + 878 = 219500
Step 251: 219500 + 878 = 220378
Step 252: 220378 + 878 = 221256
Step 253: 221256 + 878 = 222134
Step 254: 222134 + 878 = 223012
Step 255: 223012 + 878 = 223890
Step 256: 223890 + 878 = 224768
Step 257: 224768 + 878 = 225646
Step 258: 225646 + 878 = 226524
Step 259: 226524 + 878 = 227402
Step 260: 227402 + 878 = 228280
Step 261: 228280 + 878 = 229158
Step 262: 229158 + 878 = 230036
Step 263: 230036 + 878 = 230914
Step 264: 230914 + 878 = 231792
Step 265: 231792 + 878 = 232670
Step 266: 232670 + 878 = 233548
Step 267: 233548 + 878 = 234426
Step 268: 234426 + 878 = 235304
Step 269: 235304 + 878 = 236182
Step 270: 236182 + 878 = 237060
Step 271: 237060 + 878 = 237938
Step 272: 237938 + 878 = 238816
Step 273: 238816 + 878 = 239694
Step 274: 239694 + 878 = 240572
Step 275: 240572 + 878 = 241450
Step 276: 241450 + 878 = 242328
Step 277: 242328 + 878 = 243206
Step 278: 243206 + 878 = 244084
Step 279: 244084 + 878 = 244962
Step 280: 244962 + 878 = 245840
Step 281: 245840 + 878 = 246718
Step 282: 246718 + 878 = 247596
Step 283: 247596 + 878 = 248474
Step 284: 248474 + 878 = 249352
Step 285: 249352 + 878 = 250230
Step 286: 250230 + 878 = 251108
Step 287: 251108 + 878 = 251986
Step 288: 251986 + 878 = 252864
Step 289: 252864 + 878 = 253742
Step 290: 253742 + 878 = 254620
Step 291: 254620 + 878 = 255498
Step 292: 255498 + 878 = 256376
Step 293: 256376 + 878 = 257254
Step 294: 257254 + 878 = 258132
Step 295: 258132 + 878 = 259010
Step 296: 259010 + 878 = 259888
Step 297: 259888 + 878 = 260766
Step 298: 260766 + 878 = 261644
Step 299: 261644 + 878 = 262522
Step 300: 262522 + 878 = 263400
Step 301: 263400 + 878 = 264278
Step 302: 264278 + 878 = 265156
Step 303: 265156 + 878 = 266034
Step 304: 266034 + 878 = 266912
Step 305: 266912 + 878 = 267790
Step 306: 267790 + 878 = 268668
Step 307: 268668 + 878 = 269546
Step 308: 269546 + 878 = 270424
Step 309: 270424 + 878 = 271302
Step 310: 271302 + 878 = 272180
Step 311: 272180 + 878 = 273058
Step 312: 273058 + 878 = 273936
Step 313: 273936 + 878 = 274814
Step 314: 274814 + 878 = 275692
Step 315: 275692 + 878 = 276570
Step 316: 276570 + 878 = 277448
Step 317: 277448 + 878 = 278326
Step 318: 278326 + 878 = 279204
Step 319: 279204 + 878 = 280082
Step 320: 280082 + 878 = 280960
Step 321: 280960 + 878 = 281838
Step 322: 281838 + 878 = 282716
Step 323: 282716 + 878 = 283594
Step 324: 283594 + 878 = 284472
Step 325: 284472 + 878 = 285350
Step 326: 285350 + 878 = 286228
Step 327: 286228 + 878 = 287106
Step 328: 287106 + 878 = 287984
Step 329: 287984 + 878 = 288862
Step 330: 288862 + 878 = 289740
Step 331: 289740 + 878 = 290618
Step 332: 290618 + 878 = 291496
Step 333: 291496 + 878 = 292374
Step 334: 292374 + 878 = 293252
Step 335: 293252 + 878 = 294130
Step 336: 294130 + 878 = 295008
Step 337: 295008 + 878 = 295886
Step 338: 295886 + 878 = 296764
Step 339: 296764 + 878 = 297642
Step 340: 297642 + 878 = 298520
Step 341: 298520 + 878 = 299398
Step 342: 299398 + 878 = 300276
Step 343: 300276 + 878 = 301154
Step 344: 301154 + 878 = 302032
Step 345: 302032 + 878 = 302910
Step 346: 302910 + 878 = 303788
Step 347: 303788 + 878 = 304666
Step 348: 304666 + 878 = 305544
Step 349: 305544 + 878 = 306422
Step 350: 306422 + 878 = 307300
Step 351: 307300 + 878 = 308178
Step 352: 308178 + 878 = 309056
Step 353: 309056 + 878 = 309934
Step 354: 309934 + 878 = 310812
Step 355: 310812 + 878 = 311690
Step 356: 311690 + 878 = 312568
Step 357: 312568 + 878 = 313446
Step 358: 313446 + 878 = 314324
Step 359: 314324 + 878 = 315202
Step 360: 315202 + 878 = 316080
Step 361: 316080 + 878 = 316958
Step 362: 316958 + 878 = 317836
Step 363: 317836 + 878 = 318714
Step 364: 318714 + 878 = 319592
Step 365: 319592 + 878 = 320470
Step 366: 320470 + 878 = 321348
Step 367: 321348 + 878 = 322226
Step 368: 322226 + 878 = 323104
Step 369: 323104 + 878 = 323982
Step 370: 323982 + 878 = 324860
Step 371: 324860 + 878 = 325738
Step 372: 325738 + 878 = 326616
Step 373: 326616 + 878 = 327494
Step 374: 327494 + 878 = 328372
Step 375: 328372 + 878 = 329250
Step 376: 329250 + 878 = 330128
Step 377: 330128 + 878 = 331006
Step 378: 331006 + 878 = 331884
Step 379: 331884 + 878 = 332762
Step 380: 332762 + 878 = 333640
Step 381: 333640 + 878 = 334518
Step 382: 334518 + 878 = 335396
Step 383: 335396 + 878 = 336274
Step 384: 336274 + 878 = 337152
Step 385: 337152 + 878 = 338030
Step 386: 338030 + 878 = 338908
Step 387: 338908 + 878 = 339786
Step 388: 339786 + 878 = 340664
Step 389: 340664 + 878 = 341542
Step 390: 341542 + 878 = 342420
Step 391: 342420 + 878 = 343298
Step 392: 343298 + 878 = 344176
Step 393: 344176 + 878 = 345054
Step 394: 345054 + 878 = 345932

So, 878*394 = 345932