OK, let's work through this together. We're starting with 489 and we're going to multiply it by 310, which means we add 489 to itself 310 times.
Step 1: 0 + 489 = 489
Step 2: 489 + 489 = 978
Step 3: 978 + 489 = 1467
Step 4: 1467 + 489 = 1956
Step 5: 1956 + 489 = 2445
Step 6: 2445 + 489 = 2934
Step 7: 2934 + 489 = 3423
Step 8: 3423 + 489 = 3912
Step 9: 3912 + 489 = 4401
Step 10: 4401 + 489 = 4890
Step 11: 4890 + 489 = 5379
Step 12: 5379 + 489 = 5868
Step 13: 5868 + 489 = 6357
Step 14: 6357 + 489 = 6846
Step 15: 6846 + 489 = 7335
Step 16: 7335 + 489 = 7824
Step 17: 7824 + 489 = 8313
Step 18: 8313 + 489 = 8802
Step 19: 8802 + 489 = 9291
Step 20: 9291 + 489 = 9780
Step 21: 9780 + 489 = 10269
Step 22: 10269 + 489 = 10758
Step 23: 10758 + 489 = 11247
Step 24: 11247 + 489 = 11736
Step 25: 11736 + 489 = 12225
Step 26: 12225 + 489 = 12714
Step 27: 12714 + 489 = 13203
Step 28: 13203 + 489 = 13692
Step 29: 13692 + 489 = 14181
Step 30: 14181 + 489 = 14670
Step 31: 14670 + 489 = 15159
Step 32: 15159 + 489 = 15648
Step 33: 15648 + 489 = 16137
Step 34: 16137 + 489 = 16626
Step 35: 16626 + 489 = 17115
Step 36: 17115 + 489 = 17604
Step 37: 17604 + 489 = 18093
Step 38: 18093 + 489 = 18582
Step 39: 18582 + 489 = 19071
Step 40: 19071 + 489 = 19560
Step 41: 19560 + 489 = 20049
Step 42: 20049 + 489 = 20538
Step 43: 20538 + 489 = 21027
Step 44: 21027 + 489 = 21516
Step 45: 21516 + 489 = 22005
Step 46: 22005 + 489 = 22494
Step 47: 22494 + 489 = 22983
Step 48: 22983 + 489 = 23472
Step 49: 23472 + 489 = 23961
Step 50: 23961 + 489 = 24450
Step 51: 24450 + 489 = 24939
Step 52: 24939 + 489 = 25428
Step 53: 25428 + 489 = 25917
Step 54: 25917 + 489 = 26406
Step 55: 26406 + 489 = 26895
Step 56: 26895 + 489 = 27384
Step 57: 27384 + 489 = 27873
Step 58: 27873 + 489 = 28362
Step 59: 28362 + 489 = 28851
Step 60: 28851 + 489 = 29340
Step 61: 29340 + 489 = 29829
Step 62: 29829 + 489 = 30318
Step 63: 30318 + 489 = 30807
Step 64: 30807 + 489 = 31296
Step 65: 31296 + 489 = 31785
Step 66: 31785 + 489 = 32274
Step 67: 32274 + 489 = 32763
Step 68: 32763 + 489 = 33252
Step 69: 33252 + 489 = 33741
Step 70: 33741 + 489 = 34230
Step 71: 34230 + 489 = 34719
Step 72: 34719 + 489 = 35208
Step 73: 35208 + 489 = 35697
Step 74: 35697 + 489 = 36186
Step 75: 36186 + 489 = 36675
Step 76: 36675 + 489 = 37164
Step 77: 37164 + 489 = 37653
Step 78: 37653 + 489 = 38142
Step 79: 38142 + 489 = 38631
Step 80: 38631 + 489 = 39120
Step 81: 39120 + 489 = 39609
Step 82: 39609 + 489 = 40098
Step 83: 40098 + 489 = 40587
Step 84: 40587 + 489 = 41076
Step 85: 41076 + 489 = 41565
Step 86: 41565 + 489 = 42054
Step 87: 42054 + 489 = 42543
Step 88: 42543 + 489 = 43032
Step 89: 43032 + 489 = 43521
Step 90: 43521 + 489 = 44010
Step 91: 44010 + 489 = 44499
Step 92: 44499 + 489 = 44988
Step 93: 44988 + 489 = 45477
Step 94: 45477 + 489 = 45966
Step 95: 45966 + 489 = 46455
Step 96: 46455 + 489 = 46944
Step 97: 46944 + 489 = 47433
Step 98: 47433 + 489 = 47922
Step 99: 47922 + 489 = 48411
Step 100: 48411 + 489 = 48900
Step 101: 48900 + 489 = 49389
Step 102: 49389 + 489 = 49878
Step 103: 49878 + 489 = 50367
Step 104: 50367 + 489 = 50856
Step 105: 50856 + 489 = 51345
Step 106: 51345 + 489 = 51834
Step 107: 51834 + 489 = 52323
Step 108: 52323 + 489 = 52812
Step 109: 52812 + 489 = 53301
Step 110: 53301 + 489 = 53790
Step 111: 53790 + 489 = 54279
Step 112: 54279 + 489 = 54768
Step 113: 54768 + 489 = 55257
Step 114: 55257 + 489 = 55746
Step 115: 55746 + 489 = 56235
Step 116: 56235 + 489 = 56724
Step 117: 56724 + 489 = 57213
Step 118: 57213 + 489 = 57702
Step 119: 57702 + 489 = 58191
Step 120: 58191 + 489 = 58680
Step 121: 58680 + 489 = 59169
Step 122: 59169 + 489 = 59658
Step 123: 59658 + 489 = 60147
Step 124: 60147 + 489 = 60636
Step 125: 60636 + 489 = 61125
Step 126: 61125 + 489 = 61614
Step 127: 61614 + 489 = 62103
Step 128: 62103 + 489 = 62592
Step 129: 62592 + 489 = 63081
Step 130: 63081 + 489 = 63570
Step 131: 63570 + 489 = 64059
Step 132: 64059 + 489 = 64548
Step 133: 64548 + 489 = 65037
Step 134: 65037 + 489 = 65526
Step 135: 65526 + 489 = 66015
Step 136: 66015 + 489 = 66504
Step 137: 66504 + 489 = 66993
Step 138: 66993 + 489 = 67482
Step 139: 67482 + 489 = 67971
Step 140: 67971 + 489 = 68460
Step 141: 68460 + 489 = 68949
Step 142: 68949 + 489 = 69438
Step 143: 69438 + 489 = 69927
Step 144: 69927 + 489 = 70416
Step 145: 70416 + 489 = 70905
Step 146: 70905 + 489 = 71394
Step 147: 71394 + 489 = 71883
Step 148: 71883 + 489 = 72372
Step 149: 72372 + 489 = 72861
Step 150: 72861 + 489 = 73350
Step 151: 73350 + 489 = 73839
Step 152: 73839 + 489 = 74328
Step 153: 74328 + 489 = 74817
Step 154: 74817 + 489 = 75306
Step 155: 75306 + 489 = 75795
Step 156: 75795 + 489 = 76284
Step 157: 76284 + 489 = 76773
Step 158: 76773 + 489 = 77262
Step 159: 77262 + 489 = 77751
Step 160: 77751 + 489 = 78240
Step 161: 78240 + 489 = 78729
Step 162: 78729 + 489 = 79218
Step 163: 79218 + 489 = 79707
Step 164: 79707 + 489 = 80196
Step 165: 80196 + 489 = 80685
Step 166: 80685 + 489 = 81174
Step 167: 81174 + 489 = 81663
Step 168: 81663 + 489 = 82152
Step 169: 82152 + 489 = 82641
Step 170: 82641 + 489 = 83130
Step 171: 83130 + 489 = 83619
Step 172: 83619 + 489 = 84108
Step 173: 84108 + 489 = 84597
Step 174: 84597 + 489 = 85086
Step 175: 85086 + 489 = 85575
Step 176: 85575 + 489 = 86064
Step 177: 86064 + 489 = 86553
Step 178: 86553 + 489 = 87042
Step 179: 87042 + 489 = 87531
Step 180: 87531 + 489 = 88020
Step 181: 88020 + 489 = 88509
Step 182: 88509 + 489 = 88998
Step 183: 88998 + 489 = 89487
Step 184: 89487 + 489 = 89976
Step 185: 89976 + 489 = 90465
Step 186: 90465 + 489 = 90954
Step 187: 90954 + 489 = 91443
Step 188: 91443 + 489 = 91932
Step 189: 91932 + 489 = 92421
Step 190: 92421 + 489 = 92910
Step 191: 92910 + 489 = 93399
Step 192: 93399 + 489 = 93888
Step 193: 93888 + 489 = 94377
Step 194: 94377 + 489 = 94866
Step 195: 94866 + 489 = 95355
Step 196: 95355 + 489 = 95844
Step 197: 95844 + 489 = 96333
Step 198: 96333 + 489 = 96822
Step 199: 96822 + 489 = 97311
Step 200: 97311 + 489 = 97800
Step 201: 97800 + 489 = 98289
Step 202: 98289 + 489 = 98778
Step 203: 98778 + 489 = 99267
Step 204: 99267 + 489 = 99756
Step 205: 99756 + 489 = 100245
Step 206: 100245 + 489 = 100734
Step 207: 100734 + 489 = 101223
Step 208: 101223 + 489 = 101712
Step 209: 101712 + 489 = 102201
Step 210: 102201 + 489 = 102690
Step 211: 102690 + 489 = 103179
Step 212: 103179 + 489 = 103668
Step 213: 103668 + 489 = 104157
Step 214: 104157 + 489 = 104646
Step 215: 104646 + 489 = 105135
Step 216: 105135 + 489 = 105624
Step 217: 105624 + 489 = 106113
Step 218: 106113 + 489 = 106602
Step 219: 106602 + 489 = 107091
Step 220: 107091 + 489 = 107580
Step 221: 107580 + 489 = 108069
Step 222: 108069 + 489 = 108558
Step 223: 108558 + 489 = 109047
Step 224: 109047 + 489 = 109536
Step 225: 109536 + 489 = 110025
Step 226: 110025 + 489 = 110514
Step 227: 110514 + 489 = 111003
Step 228: 111003 + 489 = 111492
Step 229: 111492 + 489 = 111981
Step 230: 111981 + 489 = 112470
Step 231: 112470 + 489 = 112959
Step 232: 112959 + 489 = 113448
Step 233: 113448 + 489 = 113937
Step 234: 113937 + 489 = 114426
Step 235: 114426 + 489 = 114915
Step 236: 114915 + 489 = 115404
Step 237: 115404 + 489 = 115893
Step 238: 115893 + 489 = 116382
Step 239: 116382 + 489 = 116871
Step 240: 116871 + 489 = 117360
Step 241: 117360 + 489 = 117849
Step 242: 117849 + 489 = 118338
Step 243: 118338 + 489 = 118827
Step 244: 118827 + 489 = 119316
Step 245: 119316 + 489 = 119805
Step 246: 119805 + 489 = 120294
Step 247: 120294 + 489 = 120783
Step 248: 120783 + 489 = 121272
Step 249: 121272 + 489 = 121761
Step 250: 121761 + 489 = 122250
Step 251: 122250 + 489 = 122739
Step 252: 122739 + 489 = 123228
Step 253: 123228 + 489 = 123717
Step 254: 123717 + 489 = 124206
Step 255: 124206 + 489 = 124695
Step 256: 124695 + 489 = 125184
Step 257: 125184 + 489 = 125673
Step 258: 125673 + 489 = 126162
Step 259: 126162 + 489 = 126651
Step 260: 126651 + 489 = 127140
Step 261: 127140 + 489 = 127629
Step 262: 127629 + 489 = 128118
Step 263: 128118 + 489 = 128607
Step 264: 128607 + 489 = 129096
Step 265: 129096 + 489 = 129585
Step 266: 129585 + 489 = 130074
Step 267: 130074 + 489 = 130563
Step 268: 130563 + 489 = 131052
Step 269: 131052 + 489 = 131541
Step 270: 131541 + 489 = 132030
Step 271: 132030 + 489 = 132519
Step 272: 132519 + 489 = 133008
Step 273: 133008 + 489 = 133497
Step 274: 133497 + 489 = 133986
Step 275: 133986 + 489 = 134475
Step 276: 134475 + 489 = 134964
Step 277: 134964 + 489 = 135453
Step 278: 135453 + 489 = 135942
Step 279: 135942 + 489 = 136431
Step 280: 136431 + 489 = 136920
Step 281: 136920 + 489 = 137409
Step 282: 137409 + 489 = 137898
Step 283: 137898 + 489 = 138387
Step 284: 138387 + 489 = 138876
Step 285: 138876 + 489 = 139365
Step 286: 139365 + 489 = 139854
Step 287: 139854 + 489 = 140343
Step 288: 140343 + 489 = 140832
Step 289: 140832 + 489 = 141321
Step 290: 141321 + 489 = 141810
Step 291: 141810 + 489 = 142299
Step 292: 142299 + 489 = 142788
Step 293: 142788 + 489 = 143277
Step 294: 143277 + 489 = 143766
Step 295: 143766 + 489 = 144255
Step 296: 144255 + 489 = 144744
Step 297: 144744 + 489 = 145233
Step 298: 145233 + 489 = 145722
Step 299: 145722 + 489 = 146211
Step 300: 146211 + 489 = 146700
Step 301: 146700 + 489 = 147189
Step 302: 147189 + 489 = 147678
Step 303: 147678 + 489 = 148167
Step 304: 148167 + 489 = 148656
Step 305: 148656 + 489 = 149145
Step 306: 149145 + 489 = 149634
Step 307: 149634 + 489 = 150123
Step 308: 150123 + 489 = 150612
Step 309: 150612 + 489 = 151101
Step 310: 151101 + 489 = 151590

So, 489*310 = 151590