OK, let's work through this together. We're starting with 788 and we're going to multiply it by 257, which means we add 788 to itself 257 times.
Step 1: 0 + 788 = 788
Step 2: 788 + 788 = 1576
Step 3: 1576 + 788 = 2364
Step 4: 2364 + 788 = 3152
Step 5: 3152 + 788 = 3940
Step 6: 3940 + 788 = 4728
Step 7: 4728 + 788 = 5516
Step 8: 5516 + 788 = 6304
Step 9: 6304 + 788 = 7092
Step 10: 7092 + 788 = 7880
Step 11: 7880 + 788 = 8668
Step 12: 8668 + 788 = 9456
Step 13: 9456 + 788 = 10244
Step 14: 10244 + 788 = 11032
Step 15: 11032 + 788 = 11820
Step 16: 11820 + 788 = 12608
Step 17: 12608 + 788 = 13396
Step 18: 13396 + 788 = 14184
Step 19: 14184 + 788 = 14972
Step 20: 14972 + 788 = 15760
Step 21: 15760 + 788 = 16548
Step 22: 16548 + 788 = 17336
Step 23: 17336 + 788 = 18124
Step 24: 18124 + 788 = 18912
Step 25: 18912 + 788 = 19700
Step 26: 19700 + 788 = 20488
Step 27: 20488 + 788 = 21276
Step 28: 21276 + 788 = 22064
Step 29: 22064 + 788 = 22852
Step 30: 22852 + 788 = 23640
Step 31: 23640 + 788 = 24428
Step 32: 24428 + 788 = 25216
Step 33: 25216 + 788 = 26004
Step 34: 26004 + 788 = 26792
Step 35: 26792 + 788 = 27580
Step 36: 27580 + 788 = 28368
Step 37: 28368 + 788 = 29156
Step 38: 29156 + 788 = 29944
Step 39: 29944 + 788 = 30732
Step 40: 30732 + 788 = 31520
Step 41: 31520 + 788 = 32308
Step 42: 32308 + 788 = 33096
Step 43: 33096 + 788 = 33884
Step 44: 33884 + 788 = 34672
Step 45: 34672 + 788 = 35460
Step 46: 35460 + 788 = 36248
Step 47: 36248 + 788 = 37036
Step 48: 37036 + 788 = 37824
Step 49: 37824 + 788 = 38612
Step 50: 38612 + 788 = 39400
Step 51: 39400 + 788 = 40188
Step 52: 40188 + 788 = 40976
Step 53: 40976 + 788 = 41764
Step 54: 41764 + 788 = 42552
Step 55: 42552 + 788 = 43340
Step 56: 43340 + 788 = 44128
Step 57: 44128 + 788 = 44916
Step 58: 44916 + 788 = 45704
Step 59: 45704 + 788 = 46492
Step 60: 46492 + 788 = 47280
Step 61: 47280 + 788 = 48068
Step 62: 48068 + 788 = 48856
Step 63: 48856 + 788 = 49644
Step 64: 49644 + 788 = 50432
Step 65: 50432 + 788 = 51220
Step 66: 51220 + 788 = 52008
Step 67: 52008 + 788 = 52796
Step 68: 52796 + 788 = 53584
Step 69: 53584 + 788 = 54372
Step 70: 54372 + 788 = 55160
Step 71: 55160 + 788 = 55948
Step 72: 55948 + 788 = 56736
Step 73: 56736 + 788 = 57524
Step 74: 57524 + 788 = 58312
Step 75: 58312 + 788 = 59100
Step 76: 59100 + 788 = 59888
Step 77: 59888 + 788 = 60676
Step 78: 60676 + 788 = 61464
Step 79: 61464 + 788 = 62252
Step 80: 62252 + 788 = 63040
Step 81: 63040 + 788 = 63828
Step 82: 63828 + 788 = 64616
Step 83: 64616 + 788 = 65404
Step 84: 65404 + 788 = 66192
Step 85: 66192 + 788 = 66980
Step 86: 66980 + 788 = 67768
Step 87: 67768 + 788 = 68556
Step 88: 68556 + 788 = 69344
Step 89: 69344 + 788 = 70132
Step 90: 70132 + 788 = 70920
Step 91: 70920 + 788 = 71708
Step 92: 71708 + 788 = 72496
Step 93: 72496 + 788 = 73284
Step 94: 73284 + 788 = 74072
Step 95: 74072 + 788 = 74860
Step 96: 74860 + 788 = 75648
Step 97: 75648 + 788 = 76436
Step 98: 76436 + 788 = 77224
Step 99: 77224 + 788 = 78012
Step 100: 78012 + 788 = 78800
Step 101: 78800 + 788 = 79588
Step 102: 79588 + 788 = 80376
Step 103: 80376 + 788 = 81164
Step 104: 81164 + 788 = 81952
Step 105: 81952 + 788 = 82740
Step 106: 82740 + 788 = 83528
Step 107: 83528 + 788 = 84316
Step 108: 84316 + 788 = 85104
Step 109: 85104 + 788 = 85892
Step 110: 85892 + 788 = 86680
Step 111: 86680 + 788 = 87468
Step 112: 87468 + 788 = 88256
Step 113: 88256 + 788 = 89044
Step 114: 89044 + 788 = 89832
Step 115: 89832 + 788 = 90620
Step 116: 90620 + 788 = 91408
Step 117: 91408 + 788 = 92196
Step 118: 92196 + 788 = 92984
Step 119: 92984 + 788 = 93772
Step 120: 93772 + 788 = 94560
Step 121: 94560 + 788 = 95348
Step 122: 95348 + 788 = 96136
Step 123: 96136 + 788 = 96924
Step 124: 96924 + 788 = 97712
Step 125: 97712 + 788 = 98500
Step 126: 98500 + 788 = 99288
Step 127: 99288 + 788 = 100076
Step 128: 100076 + 788 = 100864
Step 129: 100864 + 788 = 101652
Step 130: 101652 + 788 = 102440
Step 131: 102440 + 788 = 103228
Step 132: 103228 + 788 = 104016
Step 133: 104016 + 788 = 104804
Step 134: 104804 + 788 = 105592
Step 135: 105592 + 788 = 106380
Step 136: 106380 + 788 = 107168
Step 137: 107168 + 788 = 107956
Step 138: 107956 + 788 = 108744
Step 139: 108744 + 788 = 109532
Step 140: 109532 + 788 = 110320
Step 141: 110320 + 788 = 111108
Step 142: 111108 + 788 = 111896
Step 143: 111896 + 788 = 112684
Step 144: 112684 + 788 = 113472
Step 145: 113472 + 788 = 114260
Step 146: 114260 + 788 = 115048
Step 147: 115048 + 788 = 115836
Step 148: 115836 + 788 = 116624
Step 149: 116624 + 788 = 117412
Step 150: 117412 + 788 = 118200
Step 151: 118200 + 788 = 118988
Step 152: 118988 + 788 = 119776
Step 153: 119776 + 788 = 120564
Step 154: 120564 + 788 = 121352
Step 155: 121352 + 788 = 122140
Step 156: 122140 + 788 = 122928
Step 157: 122928 + 788 = 123716
Step 158: 123716 + 788 = 124504
Step 159: 124504 + 788 = 125292
Step 160: 125292 + 788 = 126080
Step 161: 126080 + 788 = 126868
Step 162: 126868 + 788 = 127656
Step 163: 127656 + 788 = 128444
Step 164: 128444 + 788 = 129232
Step 165: 129232 + 788 = 130020
Step 166: 130020 + 788 = 130808
Step 167: 130808 + 788 = 131596
Step 168: 131596 + 788 = 132384
Step 169: 132384 + 788 = 133172
Step 170: 133172 + 788 = 133960
Step 171: 133960 + 788 = 134748
Step 172: 134748 + 788 = 135536
Step 173: 135536 + 788 = 136324
Step 174: 136324 + 788 = 137112
Step 175: 137112 + 788 = 137900
Step 176: 137900 + 788 = 138688
Step 177: 138688 + 788 = 139476
Step 178: 139476 + 788 = 140264
Step 179: 140264 + 788 = 141052
Step 180: 141052 + 788 = 141840
Step 181: 141840 + 788 = 142628
Step 182: 142628 + 788 = 143416
Step 183: 143416 + 788 = 144204
Step 184: 144204 + 788 = 144992
Step 185: 144992 + 788 = 145780
Step 186: 145780 + 788 = 146568
Step 187: 146568 + 788 = 147356
Step 188: 147356 + 788 = 148144
Step 189: 148144 + 788 = 148932
Step 190: 148932 + 788 = 149720
Step 191: 149720 + 788 = 150508
Step 192: 150508 + 788 = 151296
Step 193: 151296 + 788 = 152084
Step 194: 152084 + 788 = 152872
Step 195: 152872 + 788 = 153660
Step 196: 153660 + 788 = 154448
Step 197: 154448 + 788 = 155236
Step 198: 155236 + 788 = 156024
Step 199: 156024 + 788 = 156812
Step 200: 156812 + 788 = 157600
Step 201: 157600 + 788 = 158388
Step 202: 158388 + 788 = 159176
Step 203: 159176 + 788 = 159964
Step 204: 159964 + 788 = 160752
Step 205: 160752 + 788 = 161540
Step 206: 161540 + 788 = 162328
Step 207: 162328 + 788 = 163116
Step 208: 163116 + 788 = 163904
Step 209: 163904 + 788 = 164692
Step 210: 164692 + 788 = 165480
Step 211: 165480 + 788 = 166268
Step 212: 166268 + 788 = 167056
Step 213: 167056 + 788 = 167844
Step 214: 167844 + 788 = 168632
Step 215: 168632 + 788 = 169420
Step 216: 169420 + 788 = 170208
Step 217: 170208 + 788 = 170996
Step 218: 170996 + 788 = 171784
Step 219: 171784 + 788 = 172572
Step 220: 172572 + 788 = 173360
Step 221: 173360 + 788 = 174148
Step 222: 174148 + 788 = 174936
Step 223: 174936 + 788 = 175724
Step 224: 175724 + 788 = 176512
Step 225: 176512 + 788 = 177300
Step 226: 177300 + 788 = 178088
Step 227: 178088 + 788 = 178876
Step 228: 178876 + 788 = 179664
Step 229: 179664 + 788 = 180452
Step 230: 180452 + 788 = 181240
Step 231: 181240 + 788 = 182028
Step 232: 182028 + 788 = 182816
Step 233: 182816 + 788 = 183604
Step 234: 183604 + 788 = 184392
Step 235: 184392 + 788 = 185180
Step 236: 185180 + 788 = 185968
Step 237: 185968 + 788 = 186756
Step 238: 186756 + 788 = 187544
Step 239: 187544 + 788 = 188332
Step 240: 188332 + 788 = 189120
Step 241: 189120 + 788 = 189908
Step 242: 189908 + 788 = 190696
Step 243: 190696 + 788 = 191484
Step 244: 191484 + 788 = 192272
Step 245: 192272 + 788 = 193060
Step 246: 193060 + 788 = 193848
Step 247: 193848 + 788 = 194636
Step 248: 194636 + 788 = 195424
Step 249: 195424 + 788 = 196212
Step 250: 196212 + 788 = 197000
Step 251: 197000 + 788 = 197788
Step 252: 197788 + 788 = 198576
Step 253: 198576 + 788 = 199364
Step 254: 199364 + 788 = 200152
Step 255: 200152 + 788 = 200940
Step 256: 200940 + 788 = 201728
Step 257: 201728 + 788 = 202516

So, 788*257 = 202516