OK, let's work through this together. We're starting with 998 and we're going to multiply it by 256, which means we add 998 to itself 256 times.
Step 1: 0 + 998 = 998
Step 2: 998 + 998 = 1996
Step 3: 1996 + 998 = 2994
Step 4: 2994 + 998 = 3992
Step 5: 3992 + 998 = 4990
Step 6: 4990 + 998 = 5988
Step 7: 5988 + 998 = 6986
Step 8: 6986 + 998 = 7984
Step 9: 7984 + 998 = 8982
Step 10: 8982 + 998 = 9980
Step 11: 9980 + 998 = 10978
Step 12: 10978 + 998 = 11976
Step 13: 11976 + 998 = 12974
Step 14: 12974 + 998 = 13972
Step 15: 13972 + 998 = 14970
Step 16: 14970 + 998 = 15968
Step 17: 15968 + 998 = 16966
Step 18: 16966 + 998 = 17964
Step 19: 17964 + 998 = 18962
Step 20: 18962 + 998 = 19960
Step 21: 19960 + 998 = 20958
Step 22: 20958 + 998 = 21956
Step 23: 21956 + 998 = 22954
Step 24: 22954 + 998 = 23952
Step 25: 23952 + 998 = 24950
Step 26: 24950 + 998 = 25948
Step 27: 25948 + 998 = 26946
Step 28: 26946 + 998 = 27944
Step 29: 27944 + 998 = 28942
Step 30: 28942 + 998 = 29940
Step 31: 29940 + 998 = 30938
Step 32: 30938 + 998 = 31936
Step 33: 31936 + 998 = 32934
Step 34: 32934 + 998 = 33932
Step 35: 33932 + 998 = 34930
Step 36: 34930 + 998 = 35928
Step 37: 35928 + 998 = 36926
Step 38: 36926 + 998 = 37924
Step 39: 37924 + 998 = 38922
Step 40: 38922 + 998 = 39920
Step 41: 39920 + 998 = 40918
Step 42: 40918 + 998 = 41916
Step 43: 41916 + 998 = 42914
Step 44: 42914 + 998 = 43912
Step 45: 43912 + 998 = 44910
Step 46: 44910 + 998 = 45908
Step 47: 45908 + 998 = 46906
Step 48: 46906 + 998 = 47904
Step 49: 47904 + 998 = 48902
Step 50: 48902 + 998 = 49900
Step 51: 49900 + 998 = 50898
Step 52: 50898 + 998 = 51896
Step 53: 51896 + 998 = 52894
Step 54: 52894 + 998 = 53892
Step 55: 53892 + 998 = 54890
Step 56: 54890 + 998 = 55888
Step 57: 55888 + 998 = 56886
Step 58: 56886 + 998 = 57884
Step 59: 57884 + 998 = 58882
Step 60: 58882 + 998 = 59880
Step 61: 59880 + 998 = 60878
Step 62: 60878 + 998 = 61876
Step 63: 61876 + 998 = 62874
Step 64: 62874 + 998 = 63872
Step 65: 63872 + 998 = 64870
Step 66: 64870 + 998 = 65868
Step 67: 65868 + 998 = 66866
Step 68: 66866 + 998 = 67864
Step 69: 67864 + 998 = 68862
Step 70: 68862 + 998 = 69860
Step 71: 69860 + 998 = 70858
Step 72: 70858 + 998 = 71856
Step 73: 71856 + 998 = 72854
Step 74: 72854 + 998 = 73852
Step 75: 73852 + 998 = 74850
Step 76: 74850 + 998 = 75848
Step 77: 75848 + 998 = 76846
Step 78: 76846 + 998 = 77844
Step 79: 77844 + 998 = 78842
Step 80: 78842 + 998 = 79840
Step 81: 79840 + 998 = 80838
Step 82: 80838 + 998 = 81836
Step 83: 81836 + 998 = 82834
Step 84: 82834 + 998 = 83832
Step 85: 83832 + 998 = 84830
Step 86: 84830 + 998 = 85828
Step 87: 85828 + 998 = 86826
Step 88: 86826 + 998 = 87824
Step 89: 87824 + 998 = 88822
Step 90: 88822 + 998 = 89820
Step 91: 89820 + 998 = 90818
Step 92: 90818 + 998 = 91816
Step 93: 91816 + 998 = 92814
Step 94: 92814 + 998 = 93812
Step 95: 93812 + 998 = 94810
Step 96: 94810 + 998 = 95808
Step 97: 95808 + 998 = 96806
Step 98: 96806 + 998 = 97804
Step 99: 97804 + 998 = 98802
Step 100: 98802 + 998 = 99800
Step 101: 99800 + 998 = 100798
Step 102: 100798 + 998 = 101796
Step 103: 101796 + 998 = 102794
Step 104: 102794 + 998 = 103792
Step 105: 103792 + 998 = 104790
Step 106: 104790 + 998 = 105788
Step 107: 105788 + 998 = 106786
Step 108: 106786 + 998 = 107784
Step 109: 107784 + 998 = 108782
Step 110: 108782 + 998 = 109780
Step 111: 109780 + 998 = 110778
Step 112: 110778 + 998 = 111776
Step 113: 111776 + 998 = 112774
Step 114: 112774 + 998 = 113772
Step 115: 113772 + 998 = 114770
Step 116: 114770 + 998 = 115768
Step 117: 115768 + 998 = 116766
Step 118: 116766 + 998 = 117764
Step 119: 117764 + 998 = 118762
Step 120: 118762 + 998 = 119760
Step 121: 119760 + 998 = 120758
Step 122: 120758 + 998 = 121756
Step 123: 121756 + 998 = 122754
Step 124: 122754 + 998 = 123752
Step 125: 123752 + 998 = 124750
Step 126: 124750 + 998 = 125748
Step 127: 125748 + 998 = 126746
Step 128: 126746 + 998 = 127744
Step 129: 127744 + 998 = 128742
Step 130: 128742 + 998 = 129740
Step 131: 129740 + 998 = 130738
Step 132: 130738 + 998 = 131736
Step 133: 131736 + 998 = 132734
Step 134: 132734 + 998 = 133732
Step 135: 133732 + 998 = 134730
Step 136: 134730 + 998 = 135728
Step 137: 135728 + 998 = 136726
Step 138: 136726 + 998 = 137724
Step 139: 137724 + 998 = 138722
Step 140: 138722 + 998 = 139720
Step 141: 139720 + 998 = 140718
Step 142: 140718 + 998 = 141716
Step 143: 141716 + 998 = 142714
Step 144: 142714 + 998 = 143712
Step 145: 143712 + 998 = 144710
Step 146: 144710 + 998 = 145708
Step 147: 145708 + 998 = 146706
Step 148: 146706 + 998 = 147704
Step 149: 147704 + 998 = 148702
Step 150: 148702 + 998 = 149700
Step 151: 149700 + 998 = 150698
Step 152: 150698 + 998 = 151696
Step 153: 151696 + 998 = 152694
Step 154: 152694 + 998 = 153692
Step 155: 153692 + 998 = 154690
Step 156: 154690 + 998 = 155688
Step 157: 155688 + 998 = 156686
Step 158: 156686 + 998 = 157684
Step 159: 157684 + 998 = 158682
Step 160: 158682 + 998 = 159680
Step 161: 159680 + 998 = 160678
Step 162: 160678 + 998 = 161676
Step 163: 161676 + 998 = 162674
Step 164: 162674 + 998 = 163672
Step 165: 163672 + 998 = 164670
Step 166: 164670 + 998 = 165668
Step 167: 165668 + 998 = 166666
Step 168: 166666 + 998 = 167664
Step 169: 167664 + 998 = 168662
Step 170: 168662 + 998 = 169660
Step 171: 169660 + 998 = 170658
Step 172: 170658 + 998 = 171656
Step 173: 171656 + 998 = 172654
Step 174: 172654 + 998 = 173652
Step 175: 173652 + 998 = 174650
Step 176: 174650 + 998 = 175648
Step 177: 175648 + 998 = 176646
Step 178: 176646 + 998 = 177644
Step 179: 177644 + 998 = 178642
Step 180: 178642 + 998 = 179640
Step 181: 179640 + 998 = 180638
Step 182: 180638 + 998 = 181636
Step 183: 181636 + 998 = 182634
Step 184: 182634 + 998 = 183632
Step 185: 183632 + 998 = 184630
Step 186: 184630 + 998 = 185628
Step 187: 185628 + 998 = 186626
Step 188: 186626 + 998 = 187624
Step 189: 187624 + 998 = 188622
Step 190: 188622 + 998 = 189620
Step 191: 189620 + 998 = 190618
Step 192: 190618 + 998 = 191616
Step 193: 191616 + 998 = 192614
Step 194: 192614 + 998 = 193612
Step 195: 193612 + 998 = 194610
Step 196: 194610 + 998 = 195608
Step 197: 195608 + 998 = 196606
Step 198: 196606 + 998 = 197604
Step 199: 197604 + 998 = 198602
Step 200: 198602 + 998 = 199600
Step 201: 199600 + 998 = 200598
Step 202: 200598 + 998 = 201596
Step 203: 201596 + 998 = 202594
Step 204: 202594 + 998 = 203592
Step 205: 203592 + 998 = 204590
Step 206: 204590 + 998 = 205588
Step 207: 205588 + 998 = 206586
Step 208: 206586 + 998 = 207584
Step 209: 207584 + 998 = 208582
Step 210: 208582 + 998 = 209580
Step 211: 209580 + 998 = 210578
Step 212: 210578 + 998 = 211576
Step 213: 211576 + 998 = 212574
Step 214: 212574 + 998 = 213572
Step 215: 213572 + 998 = 214570
Step 216: 214570 + 998 = 215568
Step 217: 215568 + 998 = 216566
Step 218: 216566 + 998 = 217564
Step 219: 217564 + 998 = 218562
Step 220: 218562 + 998 = 219560
Step 221: 219560 + 998 = 220558
Step 222: 220558 + 998 = 221556
Step 223: 221556 + 998 = 222554
Step 224: 222554 + 998 = 223552
Step 225: 223552 + 998 = 224550
Step 226: 224550 + 998 = 225548
Step 227: 225548 + 998 = 226546
Step 228: 226546 + 998 = 227544
Step 229: 227544 + 998 = 228542
Step 230: 228542 + 998 = 229540
Step 231: 229540 + 998 = 230538
Step 232: 230538 + 998 = 231536
Step 233: 231536 + 998 = 232534
Step 234: 232534 + 998 = 233532
Step 235: 233532 + 998 = 234530
Step 236: 234530 + 998 = 235528
Step 237: 235528 + 998 = 236526
Step 238: 236526 + 998 = 237524
Step 239: 237524 + 998 = 238522
Step 240: 238522 + 998 = 239520
Step 241: 239520 + 998 = 240518
Step 242: 240518 + 998 = 241516
Step 243: 241516 + 998 = 242514
Step 244: 242514 + 998 = 243512
Step 245: 243512 + 998 = 244510
Step 246: 244510 + 998 = 245508
Step 247: 245508 + 998 = 246506
Step 248: 246506 + 998 = 247504
Step 249: 247504 + 998 = 248502
Step 250: 248502 + 998 = 249500
Step 251: 249500 + 998 = 250498
Step 252: 250498 + 998 = 251496
Step 253: 251496 + 998 = 252494
Step 254: 252494 + 998 = 253492
Step 255: 253492 + 998 = 254490
Step 256: 254490 + 998 = 255488

So, 998*256 = 255488