Alright, let's solve this math problem step by step. First, we have the number 505. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 154. So, we're going to take the number 505 and add it to itself 154 times.
Step 1: 0 + 505 = 505
Step 2: 505 + 505 = 1010
Step 3: 1010 + 505 = 1515
Step 4: 1515 + 505 = 2020
Step 5: 2020 + 505 = 2525
Step 6: 2525 + 505 = 3030
Step 7: 3030 + 505 = 3535
Step 8: 3535 + 505 = 4040
Step 9: 4040 + 505 = 4545
Step 10: 4545 + 505 = 5050
Step 11: 5050 + 505 = 5555
Step 12: 5555 + 505 = 6060
Step 13: 6060 + 505 = 6565
Step 14: 6565 + 505 = 7070
Step 15: 7070 + 505 = 7575
Step 16: 7575 + 505 = 8080
Step 17: 8080 + 505 = 8585
Step 18: 8585 + 505 = 9090
Step 19: 9090 + 505 = 9595
Step 20: 9595 + 505 = 10100
Step 21: 10100 + 505 = 10605
Step 22: 10605 + 505 = 11110
Step 23: 11110 + 505 = 11615
Step 24: 11615 + 505 = 12120
Step 25: 12120 + 505 = 12625
Step 26: 12625 + 505 = 13130
Step 27: 13130 + 505 = 13635
Step 28: 13635 + 505 = 14140
Step 29: 14140 + 505 = 14645
Step 30: 14645 + 505 = 15150
Step 31: 15150 + 505 = 15655
Step 32: 15655 + 505 = 16160
Step 33: 16160 + 505 = 16665
Step 34: 16665 + 505 = 17170
Step 35: 17170 + 505 = 17675
Step 36: 17675 + 505 = 18180
Step 37: 18180 + 505 = 18685
Step 38: 18685 + 505 = 19190
Step 39: 19190 + 505 = 19695
Step 40: 19695 + 505 = 20200
Step 41: 20200 + 505 = 20705
Step 42: 20705 + 505 = 21210
Step 43: 21210 + 505 = 21715
Step 44: 21715 + 505 = 22220
Step 45: 22220 + 505 = 22725
Step 46: 22725 + 505 = 23230
Step 47: 23230 + 505 = 23735
Step 48: 23735 + 505 = 24240
Step 49: 24240 + 505 = 24745
Step 50: 24745 + 505 = 25250
Step 51: 25250 + 505 = 25755
Step 52: 25755 + 505 = 26260
Step 53: 26260 + 505 = 26765
Step 54: 26765 + 505 = 27270
Step 55: 27270 + 505 = 27775
Step 56: 27775 + 505 = 28280
Step 57: 28280 + 505 = 28785
Step 58: 28785 + 505 = 29290
Step 59: 29290 + 505 = 29795
Step 60: 29795 + 505 = 30300
Step 61: 30300 + 505 = 30805
Step 62: 30805 + 505 = 31310
Step 63: 31310 + 505 = 31815
Step 64: 31815 + 505 = 32320
Step 65: 32320 + 505 = 32825
Step 66: 32825 + 505 = 33330
Step 67: 33330 + 505 = 33835
Step 68: 33835 + 505 = 34340
Step 69: 34340 + 505 = 34845
Step 70: 34845 + 505 = 35350
Step 71: 35350 + 505 = 35855
Step 72: 35855 + 505 = 36360
Step 73: 36360 + 505 = 36865
Step 74: 36865 + 505 = 37370
Step 75: 37370 + 505 = 37875
Step 76: 37875 + 505 = 38380
Step 77: 38380 + 505 = 38885
Step 78: 38885 + 505 = 39390
Step 79: 39390 + 505 = 39895
Step 80: 39895 + 505 = 40400
Step 81: 40400 + 505 = 40905
Step 82: 40905 + 505 = 41410
Step 83: 41410 + 505 = 41915
Step 84: 41915 + 505 = 42420
Step 85: 42420 + 505 = 42925
Step 86: 42925 + 505 = 43430
Step 87: 43430 + 505 = 43935
Step 88: 43935 + 505 = 44440
Step 89: 44440 + 505 = 44945
Step 90: 44945 + 505 = 45450
Step 91: 45450 + 505 = 45955
Step 92: 45955 + 505 = 46460
Step 93: 46460 + 505 = 46965
Step 94: 46965 + 505 = 47470
Step 95: 47470 + 505 = 47975
Step 96: 47975 + 505 = 48480
Step 97: 48480 + 505 = 48985
Step 98: 48985 + 505 = 49490
Step 99: 49490 + 505 = 49995
Step 100: 49995 + 505 = 50500
Step 101: 50500 + 505 = 51005
Step 102: 51005 + 505 = 51510
Step 103: 51510 + 505 = 52015
Step 104: 52015 + 505 = 52520
Step 105: 52520 + 505 = 53025
Step 106: 53025 + 505 = 53530
Step 107: 53530 + 505 = 54035
Step 108: 54035 + 505 = 54540
Step 109: 54540 + 505 = 55045
Step 110: 55045 + 505 = 55550
Step 111: 55550 + 505 = 56055
Step 112: 56055 + 505 = 56560
Step 113: 56560 + 505 = 57065
Step 114: 57065 + 505 = 57570
Step 115: 57570 + 505 = 58075
Step 116: 58075 + 505 = 58580
Step 117: 58580 + 505 = 59085
Step 118: 59085 + 505 = 59590
Step 119: 59590 + 505 = 60095
Step 120: 60095 + 505 = 60600
Step 121: 60600 + 505 = 61105
Step 122: 61105 + 505 = 61610
Step 123: 61610 + 505 = 62115
Step 124: 62115 + 505 = 62620
Step 125: 62620 + 505 = 63125
Step 126: 63125 + 505 = 63630
Step 127: 63630 + 505 = 64135
Step 128: 64135 + 505 = 64640
Step 129: 64640 + 505 = 65145
Step 130: 65145 + 505 = 65650
Step 131: 65650 + 505 = 66155
Step 132: 66155 + 505 = 66660
Step 133: 66660 + 505 = 67165
Step 134: 67165 + 505 = 67670
Step 135: 67670 + 505 = 68175
Step 136: 68175 + 505 = 68680
Step 137: 68680 + 505 = 69185
Step 138: 69185 + 505 = 69690
Step 139: 69690 + 505 = 70195
Step 140: 70195 + 505 = 70700
Step 141: 70700 + 505 = 71205
Step 142: 71205 + 505 = 71710
Step 143: 71710 + 505 = 72215
Step 144: 72215 + 505 = 72720
Step 145: 72720 + 505 = 73225
Step 146: 73225 + 505 = 73730
Step 147: 73730 + 505 = 74235
Step 148: 74235 + 505 = 74740
Step 149: 74740 + 505 = 75245
Step 150: 75245 + 505 = 75750
Step 151: 75750 + 505 = 76255
Step 152: 76255 + 505 = 76760
Step 153: 76760 + 505 = 77265
Step 154: 77265 + 505 = 77770

So, 505*154 = 77770