OK, let's work through this together. We're starting with 505 and we're going to multiply it by 250, which means we add 505 to itself 250 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
Step 155: 77770 + 505 = 78275
Step 156: 78275 + 505 = 78780
Step 157: 78780 + 505 = 79285
Step 158: 79285 + 505 = 79790
Step 159: 79790 + 505 = 80295
Step 160: 80295 + 505 = 80800
Step 161: 80800 + 505 = 81305
Step 162: 81305 + 505 = 81810
Step 163: 81810 + 505 = 82315
Step 164: 82315 + 505 = 82820
Step 165: 82820 + 505 = 83325
Step 166: 83325 + 505 = 83830
Step 167: 83830 + 505 = 84335
Step 168: 84335 + 505 = 84840
Step 169: 84840 + 505 = 85345
Step 170: 85345 + 505 = 85850
Step 171: 85850 + 505 = 86355
Step 172: 86355 + 505 = 86860
Step 173: 86860 + 505 = 87365
Step 174: 87365 + 505 = 87870
Step 175: 87870 + 505 = 88375
Step 176: 88375 + 505 = 88880
Step 177: 88880 + 505 = 89385
Step 178: 89385 + 505 = 89890
Step 179: 89890 + 505 = 90395
Step 180: 90395 + 505 = 90900
Step 181: 90900 + 505 = 91405
Step 182: 91405 + 505 = 91910
Step 183: 91910 + 505 = 92415
Step 184: 92415 + 505 = 92920
Step 185: 92920 + 505 = 93425
Step 186: 93425 + 505 = 93930
Step 187: 93930 + 505 = 94435
Step 188: 94435 + 505 = 94940
Step 189: 94940 + 505 = 95445
Step 190: 95445 + 505 = 95950
Step 191: 95950 + 505 = 96455
Step 192: 96455 + 505 = 96960
Step 193: 96960 + 505 = 97465
Step 194: 97465 + 505 = 97970
Step 195: 97970 + 505 = 98475
Step 196: 98475 + 505 = 98980
Step 197: 98980 + 505 = 99485
Step 198: 99485 + 505 = 99990
Step 199: 99990 + 505 = 100495
Step 200: 100495 + 505 = 101000
Step 201: 101000 + 505 = 101505
Step 202: 101505 + 505 = 102010
Step 203: 102010 + 505 = 102515
Step 204: 102515 + 505 = 103020
Step 205: 103020 + 505 = 103525
Step 206: 103525 + 505 = 104030
Step 207: 104030 + 505 = 104535
Step 208: 104535 + 505 = 105040
Step 209: 105040 + 505 = 105545
Step 210: 105545 + 505 = 106050
Step 211: 106050 + 505 = 106555
Step 212: 106555 + 505 = 107060
Step 213: 107060 + 505 = 107565
Step 214: 107565 + 505 = 108070
Step 215: 108070 + 505 = 108575
Step 216: 108575 + 505 = 109080
Step 217: 109080 + 505 = 109585
Step 218: 109585 + 505 = 110090
Step 219: 110090 + 505 = 110595
Step 220: 110595 + 505 = 111100
Step 221: 111100 + 505 = 111605
Step 222: 111605 + 505 = 112110
Step 223: 112110 + 505 = 112615
Step 224: 112615 + 505 = 113120
Step 225: 113120 + 505 = 113625
Step 226: 113625 + 505 = 114130
Step 227: 114130 + 505 = 114635
Step 228: 114635 + 505 = 115140
Step 229: 115140 + 505 = 115645
Step 230: 115645 + 505 = 116150
Step 231: 116150 + 505 = 116655
Step 232: 116655 + 505 = 117160
Step 233: 117160 + 505 = 117665
Step 234: 117665 + 505 = 118170
Step 235: 118170 + 505 = 118675
Step 236: 118675 + 505 = 119180
Step 237: 119180 + 505 = 119685
Step 238: 119685 + 505 = 120190
Step 239: 120190 + 505 = 120695
Step 240: 120695 + 505 = 121200
Step 241: 121200 + 505 = 121705
Step 242: 121705 + 505 = 122210
Step 243: 122210 + 505 = 122715
Step 244: 122715 + 505 = 123220
Step 245: 123220 + 505 = 123725
Step 246: 123725 + 505 = 124230
Step 247: 124230 + 505 = 124735
Step 248: 124735 + 505 = 125240
Step 249: 125240 + 505 = 125745
Step 250: 125745 + 505 = 126250

So, 505*250 = 126250