Sure thing, let's get straight to it. We start with 378 and we're going to multiply it by 335, which means adding 378 to itself 335 times.
Step 1: 0 + 378 = 378
Step 2: 378 + 378 = 756
Step 3: 756 + 378 = 1134
Step 4: 1134 + 378 = 1512
Step 5: 1512 + 378 = 1890
Step 6: 1890 + 378 = 2268
Step 7: 2268 + 378 = 2646
Step 8: 2646 + 378 = 3024
Step 9: 3024 + 378 = 3402
Step 10: 3402 + 378 = 3780
Step 11: 3780 + 378 = 4158
Step 12: 4158 + 378 = 4536
Step 13: 4536 + 378 = 4914
Step 14: 4914 + 378 = 5292
Step 15: 5292 + 378 = 5670
Step 16: 5670 + 378 = 6048
Step 17: 6048 + 378 = 6426
Step 18: 6426 + 378 = 6804
Step 19: 6804 + 378 = 7182
Step 20: 7182 + 378 = 7560
Step 21: 7560 + 378 = 7938
Step 22: 7938 + 378 = 8316
Step 23: 8316 + 378 = 8694
Step 24: 8694 + 378 = 9072
Step 25: 9072 + 378 = 9450
Step 26: 9450 + 378 = 9828
Step 27: 9828 + 378 = 10206
Step 28: 10206 + 378 = 10584
Step 29: 10584 + 378 = 10962
Step 30: 10962 + 378 = 11340
Step 31: 11340 + 378 = 11718
Step 32: 11718 + 378 = 12096
Step 33: 12096 + 378 = 12474
Step 34: 12474 + 378 = 12852
Step 35: 12852 + 378 = 13230
Step 36: 13230 + 378 = 13608
Step 37: 13608 + 378 = 13986
Step 38: 13986 + 378 = 14364
Step 39: 14364 + 378 = 14742
Step 40: 14742 + 378 = 15120
Step 41: 15120 + 378 = 15498
Step 42: 15498 + 378 = 15876
Step 43: 15876 + 378 = 16254
Step 44: 16254 + 378 = 16632
Step 45: 16632 + 378 = 17010
Step 46: 17010 + 378 = 17388
Step 47: 17388 + 378 = 17766
Step 48: 17766 + 378 = 18144
Step 49: 18144 + 378 = 18522
Step 50: 18522 + 378 = 18900
Step 51: 18900 + 378 = 19278
Step 52: 19278 + 378 = 19656
Step 53: 19656 + 378 = 20034
Step 54: 20034 + 378 = 20412
Step 55: 20412 + 378 = 20790
Step 56: 20790 + 378 = 21168
Step 57: 21168 + 378 = 21546
Step 58: 21546 + 378 = 21924
Step 59: 21924 + 378 = 22302
Step 60: 22302 + 378 = 22680
Step 61: 22680 + 378 = 23058
Step 62: 23058 + 378 = 23436
Step 63: 23436 + 378 = 23814
Step 64: 23814 + 378 = 24192
Step 65: 24192 + 378 = 24570
Step 66: 24570 + 378 = 24948
Step 67: 24948 + 378 = 25326
Step 68: 25326 + 378 = 25704
Step 69: 25704 + 378 = 26082
Step 70: 26082 + 378 = 26460
Step 71: 26460 + 378 = 26838
Step 72: 26838 + 378 = 27216
Step 73: 27216 + 378 = 27594
Step 74: 27594 + 378 = 27972
Step 75: 27972 + 378 = 28350
Step 76: 28350 + 378 = 28728
Step 77: 28728 + 378 = 29106
Step 78: 29106 + 378 = 29484
Step 79: 29484 + 378 = 29862
Step 80: 29862 + 378 = 30240
Step 81: 30240 + 378 = 30618
Step 82: 30618 + 378 = 30996
Step 83: 30996 + 378 = 31374
Step 84: 31374 + 378 = 31752
Step 85: 31752 + 378 = 32130
Step 86: 32130 + 378 = 32508
Step 87: 32508 + 378 = 32886
Step 88: 32886 + 378 = 33264
Step 89: 33264 + 378 = 33642
Step 90: 33642 + 378 = 34020
Step 91: 34020 + 378 = 34398
Step 92: 34398 + 378 = 34776
Step 93: 34776 + 378 = 35154
Step 94: 35154 + 378 = 35532
Step 95: 35532 + 378 = 35910
Step 96: 35910 + 378 = 36288
Step 97: 36288 + 378 = 36666
Step 98: 36666 + 378 = 37044
Step 99: 37044 + 378 = 37422
Step 100: 37422 + 378 = 37800
Step 101: 37800 + 378 = 38178
Step 102: 38178 + 378 = 38556
Step 103: 38556 + 378 = 38934
Step 104: 38934 + 378 = 39312
Step 105: 39312 + 378 = 39690
Step 106: 39690 + 378 = 40068
Step 107: 40068 + 378 = 40446
Step 108: 40446 + 378 = 40824
Step 109: 40824 + 378 = 41202
Step 110: 41202 + 378 = 41580
Step 111: 41580 + 378 = 41958
Step 112: 41958 + 378 = 42336
Step 113: 42336 + 378 = 42714
Step 114: 42714 + 378 = 43092
Step 115: 43092 + 378 = 43470
Step 116: 43470 + 378 = 43848
Step 117: 43848 + 378 = 44226
Step 118: 44226 + 378 = 44604
Step 119: 44604 + 378 = 44982
Step 120: 44982 + 378 = 45360
Step 121: 45360 + 378 = 45738
Step 122: 45738 + 378 = 46116
Step 123: 46116 + 378 = 46494
Step 124: 46494 + 378 = 46872
Step 125: 46872 + 378 = 47250
Step 126: 47250 + 378 = 47628
Step 127: 47628 + 378 = 48006
Step 128: 48006 + 378 = 48384
Step 129: 48384 + 378 = 48762
Step 130: 48762 + 378 = 49140
Step 131: 49140 + 378 = 49518
Step 132: 49518 + 378 = 49896
Step 133: 49896 + 378 = 50274
Step 134: 50274 + 378 = 50652
Step 135: 50652 + 378 = 51030
Step 136: 51030 + 378 = 51408
Step 137: 51408 + 378 = 51786
Step 138: 51786 + 378 = 52164
Step 139: 52164 + 378 = 52542
Step 140: 52542 + 378 = 52920
Step 141: 52920 + 378 = 53298
Step 142: 53298 + 378 = 53676
Step 143: 53676 + 378 = 54054
Step 144: 54054 + 378 = 54432
Step 145: 54432 + 378 = 54810
Step 146: 54810 + 378 = 55188
Step 147: 55188 + 378 = 55566
Step 148: 55566 + 378 = 55944
Step 149: 55944 + 378 = 56322
Step 150: 56322 + 378 = 56700
Step 151: 56700 + 378 = 57078
Step 152: 57078 + 378 = 57456
Step 153: 57456 + 378 = 57834
Step 154: 57834 + 378 = 58212
Step 155: 58212 + 378 = 58590
Step 156: 58590 + 378 = 58968
Step 157: 58968 + 378 = 59346
Step 158: 59346 + 378 = 59724
Step 159: 59724 + 378 = 60102
Step 160: 60102 + 378 = 60480
Step 161: 60480 + 378 = 60858
Step 162: 60858 + 378 = 61236
Step 163: 61236 + 378 = 61614
Step 164: 61614 + 378 = 61992
Step 165: 61992 + 378 = 62370
Step 166: 62370 + 378 = 62748
Step 167: 62748 + 378 = 63126
Step 168: 63126 + 378 = 63504
Step 169: 63504 + 378 = 63882
Step 170: 63882 + 378 = 64260
Step 171: 64260 + 378 = 64638
Step 172: 64638 + 378 = 65016
Step 173: 65016 + 378 = 65394
Step 174: 65394 + 378 = 65772
Step 175: 65772 + 378 = 66150
Step 176: 66150 + 378 = 66528
Step 177: 66528 + 378 = 66906
Step 178: 66906 + 378 = 67284
Step 179: 67284 + 378 = 67662
Step 180: 67662 + 378 = 68040
Step 181: 68040 + 378 = 68418
Step 182: 68418 + 378 = 68796
Step 183: 68796 + 378 = 69174
Step 184: 69174 + 378 = 69552
Step 185: 69552 + 378 = 69930
Step 186: 69930 + 378 = 70308
Step 187: 70308 + 378 = 70686
Step 188: 70686 + 378 = 71064
Step 189: 71064 + 378 = 71442
Step 190: 71442 + 378 = 71820
Step 191: 71820 + 378 = 72198
Step 192: 72198 + 378 = 72576
Step 193: 72576 + 378 = 72954
Step 194: 72954 + 378 = 73332
Step 195: 73332 + 378 = 73710
Step 196: 73710 + 378 = 74088
Step 197: 74088 + 378 = 74466
Step 198: 74466 + 378 = 74844
Step 199: 74844 + 378 = 75222
Step 200: 75222 + 378 = 75600
Step 201: 75600 + 378 = 75978
Step 202: 75978 + 378 = 76356
Step 203: 76356 + 378 = 76734
Step 204: 76734 + 378 = 77112
Step 205: 77112 + 378 = 77490
Step 206: 77490 + 378 = 77868
Step 207: 77868 + 378 = 78246
Step 208: 78246 + 378 = 78624
Step 209: 78624 + 378 = 79002
Step 210: 79002 + 378 = 79380
Step 211: 79380 + 378 = 79758
Step 212: 79758 + 378 = 80136
Step 213: 80136 + 378 = 80514
Step 214: 80514 + 378 = 80892
Step 215: 80892 + 378 = 81270
Step 216: 81270 + 378 = 81648
Step 217: 81648 + 378 = 82026
Step 218: 82026 + 378 = 82404
Step 219: 82404 + 378 = 82782
Step 220: 82782 + 378 = 83160
Step 221: 83160 + 378 = 83538
Step 222: 83538 + 378 = 83916
Step 223: 83916 + 378 = 84294
Step 224: 84294 + 378 = 84672
Step 225: 84672 + 378 = 85050
Step 226: 85050 + 378 = 85428
Step 227: 85428 + 378 = 85806
Step 228: 85806 + 378 = 86184
Step 229: 86184 + 378 = 86562
Step 230: 86562 + 378 = 86940
Step 231: 86940 + 378 = 87318
Step 232: 87318 + 378 = 87696
Step 233: 87696 + 378 = 88074
Step 234: 88074 + 378 = 88452
Step 235: 88452 + 378 = 88830
Step 236: 88830 + 378 = 89208
Step 237: 89208 + 378 = 89586
Step 238: 89586 + 378 = 89964
Step 239: 89964 + 378 = 90342
Step 240: 90342 + 378 = 90720
Step 241: 90720 + 378 = 91098
Step 242: 91098 + 378 = 91476
Step 243: 91476 + 378 = 91854
Step 244: 91854 + 378 = 92232
Step 245: 92232 + 378 = 92610
Step 246: 92610 + 378 = 92988
Step 247: 92988 + 378 = 93366
Step 248: 93366 + 378 = 93744
Step 249: 93744 + 378 = 94122
Step 250: 94122 + 378 = 94500
Step 251: 94500 + 378 = 94878
Step 252: 94878 + 378 = 95256
Step 253: 95256 + 378 = 95634
Step 254: 95634 + 378 = 96012
Step 255: 96012 + 378 = 96390
Step 256: 96390 + 378 = 96768
Step 257: 96768 + 378 = 97146
Step 258: 97146 + 378 = 97524
Step 259: 97524 + 378 = 97902
Step 260: 97902 + 378 = 98280
Step 261: 98280 + 378 = 98658
Step 262: 98658 + 378 = 99036
Step 263: 99036 + 378 = 99414
Step 264: 99414 + 378 = 99792
Step 265: 99792 + 378 = 100170
Step 266: 100170 + 378 = 100548
Step 267: 100548 + 378 = 100926
Step 268: 100926 + 378 = 101304
Step 269: 101304 + 378 = 101682
Step 270: 101682 + 378 = 102060
Step 271: 102060 + 378 = 102438
Step 272: 102438 + 378 = 102816
Step 273: 102816 + 378 = 103194
Step 274: 103194 + 378 = 103572
Step 275: 103572 + 378 = 103950
Step 276: 103950 + 378 = 104328
Step 277: 104328 + 378 = 104706
Step 278: 104706 + 378 = 105084
Step 279: 105084 + 378 = 105462
Step 280: 105462 + 378 = 105840
Step 281: 105840 + 378 = 106218
Step 282: 106218 + 378 = 106596
Step 283: 106596 + 378 = 106974
Step 284: 106974 + 378 = 107352
Step 285: 107352 + 378 = 107730
Step 286: 107730 + 378 = 108108
Step 287: 108108 + 378 = 108486
Step 288: 108486 + 378 = 108864
Step 289: 108864 + 378 = 109242
Step 290: 109242 + 378 = 109620
Step 291: 109620 + 378 = 109998
Step 292: 109998 + 378 = 110376
Step 293: 110376 + 378 = 110754
Step 294: 110754 + 378 = 111132
Step 295: 111132 + 378 = 111510
Step 296: 111510 + 378 = 111888
Step 297: 111888 + 378 = 112266
Step 298: 112266 + 378 = 112644
Step 299: 112644 + 378 = 113022
Step 300: 113022 + 378 = 113400
Step 301: 113400 + 378 = 113778
Step 302: 113778 + 378 = 114156
Step 303: 114156 + 378 = 114534
Step 304: 114534 + 378 = 114912
Step 305: 114912 + 378 = 115290
Step 306: 115290 + 378 = 115668
Step 307: 115668 + 378 = 116046
Step 308: 116046 + 378 = 116424
Step 309: 116424 + 378 = 116802
Step 310: 116802 + 378 = 117180
Step 311: 117180 + 378 = 117558
Step 312: 117558 + 378 = 117936
Step 313: 117936 + 378 = 118314
Step 314: 118314 + 378 = 118692
Step 315: 118692 + 378 = 119070
Step 316: 119070 + 378 = 119448
Step 317: 119448 + 378 = 119826
Step 318: 119826 + 378 = 120204
Step 319: 120204 + 378 = 120582
Step 320: 120582 + 378 = 120960
Step 321: 120960 + 378 = 121338
Step 322: 121338 + 378 = 121716
Step 323: 121716 + 378 = 122094
Step 324: 122094 + 378 = 122472
Step 325: 122472 + 378 = 122850
Step 326: 122850 + 378 = 123228
Step 327: 123228 + 378 = 123606
Step 328: 123606 + 378 = 123984
Step 329: 123984 + 378 = 124362
Step 330: 124362 + 378 = 124740
Step 331: 124740 + 378 = 125118
Step 332: 125118 + 378 = 125496
Step 333: 125496 + 378 = 125874
Step 334: 125874 + 378 = 126252
Step 335: 126252 + 378 = 126630

So, 378*335 = 126630