Sure thing, let's get straight to it. We start with 787 and we're going to multiply it by 331, which means adding 787 to itself 331 times.
Step 1: 0 + 787 = 787
Step 2: 787 + 787 = 1574
Step 3: 1574 + 787 = 2361
Step 4: 2361 + 787 = 3148
Step 5: 3148 + 787 = 3935
Step 6: 3935 + 787 = 4722
Step 7: 4722 + 787 = 5509
Step 8: 5509 + 787 = 6296
Step 9: 6296 + 787 = 7083
Step 10: 7083 + 787 = 7870
Step 11: 7870 + 787 = 8657
Step 12: 8657 + 787 = 9444
Step 13: 9444 + 787 = 10231
Step 14: 10231 + 787 = 11018
Step 15: 11018 + 787 = 11805
Step 16: 11805 + 787 = 12592
Step 17: 12592 + 787 = 13379
Step 18: 13379 + 787 = 14166
Step 19: 14166 + 787 = 14953
Step 20: 14953 + 787 = 15740
Step 21: 15740 + 787 = 16527
Step 22: 16527 + 787 = 17314
Step 23: 17314 + 787 = 18101
Step 24: 18101 + 787 = 18888
Step 25: 18888 + 787 = 19675
Step 26: 19675 + 787 = 20462
Step 27: 20462 + 787 = 21249
Step 28: 21249 + 787 = 22036
Step 29: 22036 + 787 = 22823
Step 30: 22823 + 787 = 23610
Step 31: 23610 + 787 = 24397
Step 32: 24397 + 787 = 25184
Step 33: 25184 + 787 = 25971
Step 34: 25971 + 787 = 26758
Step 35: 26758 + 787 = 27545
Step 36: 27545 + 787 = 28332
Step 37: 28332 + 787 = 29119
Step 38: 29119 + 787 = 29906
Step 39: 29906 + 787 = 30693
Step 40: 30693 + 787 = 31480
Step 41: 31480 + 787 = 32267
Step 42: 32267 + 787 = 33054
Step 43: 33054 + 787 = 33841
Step 44: 33841 + 787 = 34628
Step 45: 34628 + 787 = 35415
Step 46: 35415 + 787 = 36202
Step 47: 36202 + 787 = 36989
Step 48: 36989 + 787 = 37776
Step 49: 37776 + 787 = 38563
Step 50: 38563 + 787 = 39350
Step 51: 39350 + 787 = 40137
Step 52: 40137 + 787 = 40924
Step 53: 40924 + 787 = 41711
Step 54: 41711 + 787 = 42498
Step 55: 42498 + 787 = 43285
Step 56: 43285 + 787 = 44072
Step 57: 44072 + 787 = 44859
Step 58: 44859 + 787 = 45646
Step 59: 45646 + 787 = 46433
Step 60: 46433 + 787 = 47220
Step 61: 47220 + 787 = 48007
Step 62: 48007 + 787 = 48794
Step 63: 48794 + 787 = 49581
Step 64: 49581 + 787 = 50368
Step 65: 50368 + 787 = 51155
Step 66: 51155 + 787 = 51942
Step 67: 51942 + 787 = 52729
Step 68: 52729 + 787 = 53516
Step 69: 53516 + 787 = 54303
Step 70: 54303 + 787 = 55090
Step 71: 55090 + 787 = 55877
Step 72: 55877 + 787 = 56664
Step 73: 56664 + 787 = 57451
Step 74: 57451 + 787 = 58238
Step 75: 58238 + 787 = 59025
Step 76: 59025 + 787 = 59812
Step 77: 59812 + 787 = 60599
Step 78: 60599 + 787 = 61386
Step 79: 61386 + 787 = 62173
Step 80: 62173 + 787 = 62960
Step 81: 62960 + 787 = 63747
Step 82: 63747 + 787 = 64534
Step 83: 64534 + 787 = 65321
Step 84: 65321 + 787 = 66108
Step 85: 66108 + 787 = 66895
Step 86: 66895 + 787 = 67682
Step 87: 67682 + 787 = 68469
Step 88: 68469 + 787 = 69256
Step 89: 69256 + 787 = 70043
Step 90: 70043 + 787 = 70830
Step 91: 70830 + 787 = 71617
Step 92: 71617 + 787 = 72404
Step 93: 72404 + 787 = 73191
Step 94: 73191 + 787 = 73978
Step 95: 73978 + 787 = 74765
Step 96: 74765 + 787 = 75552
Step 97: 75552 + 787 = 76339
Step 98: 76339 + 787 = 77126
Step 99: 77126 + 787 = 77913
Step 100: 77913 + 787 = 78700
Step 101: 78700 + 787 = 79487
Step 102: 79487 + 787 = 80274
Step 103: 80274 + 787 = 81061
Step 104: 81061 + 787 = 81848
Step 105: 81848 + 787 = 82635
Step 106: 82635 + 787 = 83422
Step 107: 83422 + 787 = 84209
Step 108: 84209 + 787 = 84996
Step 109: 84996 + 787 = 85783
Step 110: 85783 + 787 = 86570
Step 111: 86570 + 787 = 87357
Step 112: 87357 + 787 = 88144
Step 113: 88144 + 787 = 88931
Step 114: 88931 + 787 = 89718
Step 115: 89718 + 787 = 90505
Step 116: 90505 + 787 = 91292
Step 117: 91292 + 787 = 92079
Step 118: 92079 + 787 = 92866
Step 119: 92866 + 787 = 93653
Step 120: 93653 + 787 = 94440
Step 121: 94440 + 787 = 95227
Step 122: 95227 + 787 = 96014
Step 123: 96014 + 787 = 96801
Step 124: 96801 + 787 = 97588
Step 125: 97588 + 787 = 98375
Step 126: 98375 + 787 = 99162
Step 127: 99162 + 787 = 99949
Step 128: 99949 + 787 = 100736
Step 129: 100736 + 787 = 101523
Step 130: 101523 + 787 = 102310
Step 131: 102310 + 787 = 103097
Step 132: 103097 + 787 = 103884
Step 133: 103884 + 787 = 104671
Step 134: 104671 + 787 = 105458
Step 135: 105458 + 787 = 106245
Step 136: 106245 + 787 = 107032
Step 137: 107032 + 787 = 107819
Step 138: 107819 + 787 = 108606
Step 139: 108606 + 787 = 109393
Step 140: 109393 + 787 = 110180
Step 141: 110180 + 787 = 110967
Step 142: 110967 + 787 = 111754
Step 143: 111754 + 787 = 112541
Step 144: 112541 + 787 = 113328
Step 145: 113328 + 787 = 114115
Step 146: 114115 + 787 = 114902
Step 147: 114902 + 787 = 115689
Step 148: 115689 + 787 = 116476
Step 149: 116476 + 787 = 117263
Step 150: 117263 + 787 = 118050
Step 151: 118050 + 787 = 118837
Step 152: 118837 + 787 = 119624
Step 153: 119624 + 787 = 120411
Step 154: 120411 + 787 = 121198
Step 155: 121198 + 787 = 121985
Step 156: 121985 + 787 = 122772
Step 157: 122772 + 787 = 123559
Step 158: 123559 + 787 = 124346
Step 159: 124346 + 787 = 125133
Step 160: 125133 + 787 = 125920
Step 161: 125920 + 787 = 126707
Step 162: 126707 + 787 = 127494
Step 163: 127494 + 787 = 128281
Step 164: 128281 + 787 = 129068
Step 165: 129068 + 787 = 129855
Step 166: 129855 + 787 = 130642
Step 167: 130642 + 787 = 131429
Step 168: 131429 + 787 = 132216
Step 169: 132216 + 787 = 133003
Step 170: 133003 + 787 = 133790
Step 171: 133790 + 787 = 134577
Step 172: 134577 + 787 = 135364
Step 173: 135364 + 787 = 136151
Step 174: 136151 + 787 = 136938
Step 175: 136938 + 787 = 137725
Step 176: 137725 + 787 = 138512
Step 177: 138512 + 787 = 139299
Step 178: 139299 + 787 = 140086
Step 179: 140086 + 787 = 140873
Step 180: 140873 + 787 = 141660
Step 181: 141660 + 787 = 142447
Step 182: 142447 + 787 = 143234
Step 183: 143234 + 787 = 144021
Step 184: 144021 + 787 = 144808
Step 185: 144808 + 787 = 145595
Step 186: 145595 + 787 = 146382
Step 187: 146382 + 787 = 147169
Step 188: 147169 + 787 = 147956
Step 189: 147956 + 787 = 148743
Step 190: 148743 + 787 = 149530
Step 191: 149530 + 787 = 150317
Step 192: 150317 + 787 = 151104
Step 193: 151104 + 787 = 151891
Step 194: 151891 + 787 = 152678
Step 195: 152678 + 787 = 153465
Step 196: 153465 + 787 = 154252
Step 197: 154252 + 787 = 155039
Step 198: 155039 + 787 = 155826
Step 199: 155826 + 787 = 156613
Step 200: 156613 + 787 = 157400
Step 201: 157400 + 787 = 158187
Step 202: 158187 + 787 = 158974
Step 203: 158974 + 787 = 159761
Step 204: 159761 + 787 = 160548
Step 205: 160548 + 787 = 161335
Step 206: 161335 + 787 = 162122
Step 207: 162122 + 787 = 162909
Step 208: 162909 + 787 = 163696
Step 209: 163696 + 787 = 164483
Step 210: 164483 + 787 = 165270
Step 211: 165270 + 787 = 166057
Step 212: 166057 + 787 = 166844
Step 213: 166844 + 787 = 167631
Step 214: 167631 + 787 = 168418
Step 215: 168418 + 787 = 169205
Step 216: 169205 + 787 = 169992
Step 217: 169992 + 787 = 170779
Step 218: 170779 + 787 = 171566
Step 219: 171566 + 787 = 172353
Step 220: 172353 + 787 = 173140
Step 221: 173140 + 787 = 173927
Step 222: 173927 + 787 = 174714
Step 223: 174714 + 787 = 175501
Step 224: 175501 + 787 = 176288
Step 225: 176288 + 787 = 177075
Step 226: 177075 + 787 = 177862
Step 227: 177862 + 787 = 178649
Step 228: 178649 + 787 = 179436
Step 229: 179436 + 787 = 180223
Step 230: 180223 + 787 = 181010
Step 231: 181010 + 787 = 181797
Step 232: 181797 + 787 = 182584
Step 233: 182584 + 787 = 183371
Step 234: 183371 + 787 = 184158
Step 235: 184158 + 787 = 184945
Step 236: 184945 + 787 = 185732
Step 237: 185732 + 787 = 186519
Step 238: 186519 + 787 = 187306
Step 239: 187306 + 787 = 188093
Step 240: 188093 + 787 = 188880
Step 241: 188880 + 787 = 189667
Step 242: 189667 + 787 = 190454
Step 243: 190454 + 787 = 191241
Step 244: 191241 + 787 = 192028
Step 245: 192028 + 787 = 192815
Step 246: 192815 + 787 = 193602
Step 247: 193602 + 787 = 194389
Step 248: 194389 + 787 = 195176
Step 249: 195176 + 787 = 195963
Step 250: 195963 + 787 = 196750
Step 251: 196750 + 787 = 197537
Step 252: 197537 + 787 = 198324
Step 253: 198324 + 787 = 199111
Step 254: 199111 + 787 = 199898
Step 255: 199898 + 787 = 200685
Step 256: 200685 + 787 = 201472
Step 257: 201472 + 787 = 202259
Step 258: 202259 + 787 = 203046
Step 259: 203046 + 787 = 203833
Step 260: 203833 + 787 = 204620
Step 261: 204620 + 787 = 205407
Step 262: 205407 + 787 = 206194
Step 263: 206194 + 787 = 206981
Step 264: 206981 + 787 = 207768
Step 265: 207768 + 787 = 208555
Step 266: 208555 + 787 = 209342
Step 267: 209342 + 787 = 210129
Step 268: 210129 + 787 = 210916
Step 269: 210916 + 787 = 211703
Step 270: 211703 + 787 = 212490
Step 271: 212490 + 787 = 213277
Step 272: 213277 + 787 = 214064
Step 273: 214064 + 787 = 214851
Step 274: 214851 + 787 = 215638
Step 275: 215638 + 787 = 216425
Step 276: 216425 + 787 = 217212
Step 277: 217212 + 787 = 217999
Step 278: 217999 + 787 = 218786
Step 279: 218786 + 787 = 219573
Step 280: 219573 + 787 = 220360
Step 281: 220360 + 787 = 221147
Step 282: 221147 + 787 = 221934
Step 283: 221934 + 787 = 222721
Step 284: 222721 + 787 = 223508
Step 285: 223508 + 787 = 224295
Step 286: 224295 + 787 = 225082
Step 287: 225082 + 787 = 225869
Step 288: 225869 + 787 = 226656
Step 289: 226656 + 787 = 227443
Step 290: 227443 + 787 = 228230
Step 291: 228230 + 787 = 229017
Step 292: 229017 + 787 = 229804
Step 293: 229804 + 787 = 230591
Step 294: 230591 + 787 = 231378
Step 295: 231378 + 787 = 232165
Step 296: 232165 + 787 = 232952
Step 297: 232952 + 787 = 233739
Step 298: 233739 + 787 = 234526
Step 299: 234526 + 787 = 235313
Step 300: 235313 + 787 = 236100
Step 301: 236100 + 787 = 236887
Step 302: 236887 + 787 = 237674
Step 303: 237674 + 787 = 238461
Step 304: 238461 + 787 = 239248
Step 305: 239248 + 787 = 240035
Step 306: 240035 + 787 = 240822
Step 307: 240822 + 787 = 241609
Step 308: 241609 + 787 = 242396
Step 309: 242396 + 787 = 243183
Step 310: 243183 + 787 = 243970
Step 311: 243970 + 787 = 244757
Step 312: 244757 + 787 = 245544
Step 313: 245544 + 787 = 246331
Step 314: 246331 + 787 = 247118
Step 315: 247118 + 787 = 247905
Step 316: 247905 + 787 = 248692
Step 317: 248692 + 787 = 249479
Step 318: 249479 + 787 = 250266
Step 319: 250266 + 787 = 251053
Step 320: 251053 + 787 = 251840
Step 321: 251840 + 787 = 252627
Step 322: 252627 + 787 = 253414
Step 323: 253414 + 787 = 254201
Step 324: 254201 + 787 = 254988
Step 325: 254988 + 787 = 255775
Step 326: 255775 + 787 = 256562
Step 327: 256562 + 787 = 257349
Step 328: 257349 + 787 = 258136
Step 329: 258136 + 787 = 258923
Step 330: 258923 + 787 = 259710
Step 331: 259710 + 787 = 260497

So, 787*331 = 260497