Let's get this math done. We have 312 and we're going to multiply it by 490. This is the same as taking 312 and adding it to itself 490 times.
Step 1: 0 + 312 = 312
Step 2: 312 + 312 = 624
Step 3: 624 + 312 = 936
Step 4: 936 + 312 = 1248
Step 5: 1248 + 312 = 1560
Step 6: 1560 + 312 = 1872
Step 7: 1872 + 312 = 2184
Step 8: 2184 + 312 = 2496
Step 9: 2496 + 312 = 2808
Step 10: 2808 + 312 = 3120
Step 11: 3120 + 312 = 3432
Step 12: 3432 + 312 = 3744
Step 13: 3744 + 312 = 4056
Step 14: 4056 + 312 = 4368
Step 15: 4368 + 312 = 4680
Step 16: 4680 + 312 = 4992
Step 17: 4992 + 312 = 5304
Step 18: 5304 + 312 = 5616
Step 19: 5616 + 312 = 5928
Step 20: 5928 + 312 = 6240
Step 21: 6240 + 312 = 6552
Step 22: 6552 + 312 = 6864
Step 23: 6864 + 312 = 7176
Step 24: 7176 + 312 = 7488
Step 25: 7488 + 312 = 7800
Step 26: 7800 + 312 = 8112
Step 27: 8112 + 312 = 8424
Step 28: 8424 + 312 = 8736
Step 29: 8736 + 312 = 9048
Step 30: 9048 + 312 = 9360
Step 31: 9360 + 312 = 9672
Step 32: 9672 + 312 = 9984
Step 33: 9984 + 312 = 10296
Step 34: 10296 + 312 = 10608
Step 35: 10608 + 312 = 10920
Step 36: 10920 + 312 = 11232
Step 37: 11232 + 312 = 11544
Step 38: 11544 + 312 = 11856
Step 39: 11856 + 312 = 12168
Step 40: 12168 + 312 = 12480
Step 41: 12480 + 312 = 12792
Step 42: 12792 + 312 = 13104
Step 43: 13104 + 312 = 13416
Step 44: 13416 + 312 = 13728
Step 45: 13728 + 312 = 14040
Step 46: 14040 + 312 = 14352
Step 47: 14352 + 312 = 14664
Step 48: 14664 + 312 = 14976
Step 49: 14976 + 312 = 15288
Step 50: 15288 + 312 = 15600
Step 51: 15600 + 312 = 15912
Step 52: 15912 + 312 = 16224
Step 53: 16224 + 312 = 16536
Step 54: 16536 + 312 = 16848
Step 55: 16848 + 312 = 17160
Step 56: 17160 + 312 = 17472
Step 57: 17472 + 312 = 17784
Step 58: 17784 + 312 = 18096
Step 59: 18096 + 312 = 18408
Step 60: 18408 + 312 = 18720
Step 61: 18720 + 312 = 19032
Step 62: 19032 + 312 = 19344
Step 63: 19344 + 312 = 19656
Step 64: 19656 + 312 = 19968
Step 65: 19968 + 312 = 20280
Step 66: 20280 + 312 = 20592
Step 67: 20592 + 312 = 20904
Step 68: 20904 + 312 = 21216
Step 69: 21216 + 312 = 21528
Step 70: 21528 + 312 = 21840
Step 71: 21840 + 312 = 22152
Step 72: 22152 + 312 = 22464
Step 73: 22464 + 312 = 22776
Step 74: 22776 + 312 = 23088
Step 75: 23088 + 312 = 23400
Step 76: 23400 + 312 = 23712
Step 77: 23712 + 312 = 24024
Step 78: 24024 + 312 = 24336
Step 79: 24336 + 312 = 24648
Step 80: 24648 + 312 = 24960
Step 81: 24960 + 312 = 25272
Step 82: 25272 + 312 = 25584
Step 83: 25584 + 312 = 25896
Step 84: 25896 + 312 = 26208
Step 85: 26208 + 312 = 26520
Step 86: 26520 + 312 = 26832
Step 87: 26832 + 312 = 27144
Step 88: 27144 + 312 = 27456
Step 89: 27456 + 312 = 27768
Step 90: 27768 + 312 = 28080
Step 91: 28080 + 312 = 28392
Step 92: 28392 + 312 = 28704
Step 93: 28704 + 312 = 29016
Step 94: 29016 + 312 = 29328
Step 95: 29328 + 312 = 29640
Step 96: 29640 + 312 = 29952
Step 97: 29952 + 312 = 30264
Step 98: 30264 + 312 = 30576
Step 99: 30576 + 312 = 30888
Step 100: 30888 + 312 = 31200
Step 101: 31200 + 312 = 31512
Step 102: 31512 + 312 = 31824
Step 103: 31824 + 312 = 32136
Step 104: 32136 + 312 = 32448
Step 105: 32448 + 312 = 32760
Step 106: 32760 + 312 = 33072
Step 107: 33072 + 312 = 33384
Step 108: 33384 + 312 = 33696
Step 109: 33696 + 312 = 34008
Step 110: 34008 + 312 = 34320
Step 111: 34320 + 312 = 34632
Step 112: 34632 + 312 = 34944
Step 113: 34944 + 312 = 35256
Step 114: 35256 + 312 = 35568
Step 115: 35568 + 312 = 35880
Step 116: 35880 + 312 = 36192
Step 117: 36192 + 312 = 36504
Step 118: 36504 + 312 = 36816
Step 119: 36816 + 312 = 37128
Step 120: 37128 + 312 = 37440
Step 121: 37440 + 312 = 37752
Step 122: 37752 + 312 = 38064
Step 123: 38064 + 312 = 38376
Step 124: 38376 + 312 = 38688
Step 125: 38688 + 312 = 39000
Step 126: 39000 + 312 = 39312
Step 127: 39312 + 312 = 39624
Step 128: 39624 + 312 = 39936
Step 129: 39936 + 312 = 40248
Step 130: 40248 + 312 = 40560
Step 131: 40560 + 312 = 40872
Step 132: 40872 + 312 = 41184
Step 133: 41184 + 312 = 41496
Step 134: 41496 + 312 = 41808
Step 135: 41808 + 312 = 42120
Step 136: 42120 + 312 = 42432
Step 137: 42432 + 312 = 42744
Step 138: 42744 + 312 = 43056
Step 139: 43056 + 312 = 43368
Step 140: 43368 + 312 = 43680
Step 141: 43680 + 312 = 43992
Step 142: 43992 + 312 = 44304
Step 143: 44304 + 312 = 44616
Step 144: 44616 + 312 = 44928
Step 145: 44928 + 312 = 45240
Step 146: 45240 + 312 = 45552
Step 147: 45552 + 312 = 45864
Step 148: 45864 + 312 = 46176
Step 149: 46176 + 312 = 46488
Step 150: 46488 + 312 = 46800
Step 151: 46800 + 312 = 47112
Step 152: 47112 + 312 = 47424
Step 153: 47424 + 312 = 47736
Step 154: 47736 + 312 = 48048
Step 155: 48048 + 312 = 48360
Step 156: 48360 + 312 = 48672
Step 157: 48672 + 312 = 48984
Step 158: 48984 + 312 = 49296
Step 159: 49296 + 312 = 49608
Step 160: 49608 + 312 = 49920
Step 161: 49920 + 312 = 50232
Step 162: 50232 + 312 = 50544
Step 163: 50544 + 312 = 50856
Step 164: 50856 + 312 = 51168
Step 165: 51168 + 312 = 51480
Step 166: 51480 + 312 = 51792
Step 167: 51792 + 312 = 52104
Step 168: 52104 + 312 = 52416
Step 169: 52416 + 312 = 52728
Step 170: 52728 + 312 = 53040
Step 171: 53040 + 312 = 53352
Step 172: 53352 + 312 = 53664
Step 173: 53664 + 312 = 53976
Step 174: 53976 + 312 = 54288
Step 175: 54288 + 312 = 54600
Step 176: 54600 + 312 = 54912
Step 177: 54912 + 312 = 55224
Step 178: 55224 + 312 = 55536
Step 179: 55536 + 312 = 55848
Step 180: 55848 + 312 = 56160
Step 181: 56160 + 312 = 56472
Step 182: 56472 + 312 = 56784
Step 183: 56784 + 312 = 57096
Step 184: 57096 + 312 = 57408
Step 185: 57408 + 312 = 57720
Step 186: 57720 + 312 = 58032
Step 187: 58032 + 312 = 58344
Step 188: 58344 + 312 = 58656
Step 189: 58656 + 312 = 58968
Step 190: 58968 + 312 = 59280
Step 191: 59280 + 312 = 59592
Step 192: 59592 + 312 = 59904
Step 193: 59904 + 312 = 60216
Step 194: 60216 + 312 = 60528
Step 195: 60528 + 312 = 60840
Step 196: 60840 + 312 = 61152
Step 197: 61152 + 312 = 61464
Step 198: 61464 + 312 = 61776
Step 199: 61776 + 312 = 62088
Step 200: 62088 + 312 = 62400
Step 201: 62400 + 312 = 62712
Step 202: 62712 + 312 = 63024
Step 203: 63024 + 312 = 63336
Step 204: 63336 + 312 = 63648
Step 205: 63648 + 312 = 63960
Step 206: 63960 + 312 = 64272
Step 207: 64272 + 312 = 64584
Step 208: 64584 + 312 = 64896
Step 209: 64896 + 312 = 65208
Step 210: 65208 + 312 = 65520
Step 211: 65520 + 312 = 65832
Step 212: 65832 + 312 = 66144
Step 213: 66144 + 312 = 66456
Step 214: 66456 + 312 = 66768
Step 215: 66768 + 312 = 67080
Step 216: 67080 + 312 = 67392
Step 217: 67392 + 312 = 67704
Step 218: 67704 + 312 = 68016
Step 219: 68016 + 312 = 68328
Step 220: 68328 + 312 = 68640
Step 221: 68640 + 312 = 68952
Step 222: 68952 + 312 = 69264
Step 223: 69264 + 312 = 69576
Step 224: 69576 + 312 = 69888
Step 225: 69888 + 312 = 70200
Step 226: 70200 + 312 = 70512
Step 227: 70512 + 312 = 70824
Step 228: 70824 + 312 = 71136
Step 229: 71136 + 312 = 71448
Step 230: 71448 + 312 = 71760
Step 231: 71760 + 312 = 72072
Step 232: 72072 + 312 = 72384
Step 233: 72384 + 312 = 72696
Step 234: 72696 + 312 = 73008
Step 235: 73008 + 312 = 73320
Step 236: 73320 + 312 = 73632
Step 237: 73632 + 312 = 73944
Step 238: 73944 + 312 = 74256
Step 239: 74256 + 312 = 74568
Step 240: 74568 + 312 = 74880
Step 241: 74880 + 312 = 75192
Step 242: 75192 + 312 = 75504
Step 243: 75504 + 312 = 75816
Step 244: 75816 + 312 = 76128
Step 245: 76128 + 312 = 76440
Step 246: 76440 + 312 = 76752
Step 247: 76752 + 312 = 77064
Step 248: 77064 + 312 = 77376
Step 249: 77376 + 312 = 77688
Step 250: 77688 + 312 = 78000
Step 251: 78000 + 312 = 78312
Step 252: 78312 + 312 = 78624
Step 253: 78624 + 312 = 78936
Step 254: 78936 + 312 = 79248
Step 255: 79248 + 312 = 79560
Step 256: 79560 + 312 = 79872
Step 257: 79872 + 312 = 80184
Step 258: 80184 + 312 = 80496
Step 259: 80496 + 312 = 80808
Step 260: 80808 + 312 = 81120
Step 261: 81120 + 312 = 81432
Step 262: 81432 + 312 = 81744
Step 263: 81744 + 312 = 82056
Step 264: 82056 + 312 = 82368
Step 265: 82368 + 312 = 82680
Step 266: 82680 + 312 = 82992
Step 267: 82992 + 312 = 83304
Step 268: 83304 + 312 = 83616
Step 269: 83616 + 312 = 83928
Step 270: 83928 + 312 = 84240
Step 271: 84240 + 312 = 84552
Step 272: 84552 + 312 = 84864
Step 273: 84864 + 312 = 85176
Step 274: 85176 + 312 = 85488
Step 275: 85488 + 312 = 85800
Step 276: 85800 + 312 = 86112
Step 277: 86112 + 312 = 86424
Step 278: 86424 + 312 = 86736
Step 279: 86736 + 312 = 87048
Step 280: 87048 + 312 = 87360
Step 281: 87360 + 312 = 87672
Step 282: 87672 + 312 = 87984
Step 283: 87984 + 312 = 88296
Step 284: 88296 + 312 = 88608
Step 285: 88608 + 312 = 88920
Step 286: 88920 + 312 = 89232
Step 287: 89232 + 312 = 89544
Step 288: 89544 + 312 = 89856
Step 289: 89856 + 312 = 90168
Step 290: 90168 + 312 = 90480
Step 291: 90480 + 312 = 90792
Step 292: 90792 + 312 = 91104
Step 293: 91104 + 312 = 91416
Step 294: 91416 + 312 = 91728
Step 295: 91728 + 312 = 92040
Step 296: 92040 + 312 = 92352
Step 297: 92352 + 312 = 92664
Step 298: 92664 + 312 = 92976
Step 299: 92976 + 312 = 93288
Step 300: 93288 + 312 = 93600
Step 301: 93600 + 312 = 93912
Step 302: 93912 + 312 = 94224
Step 303: 94224 + 312 = 94536
Step 304: 94536 + 312 = 94848
Step 305: 94848 + 312 = 95160
Step 306: 95160 + 312 = 95472
Step 307: 95472 + 312 = 95784
Step 308: 95784 + 312 = 96096
Step 309: 96096 + 312 = 96408
Step 310: 96408 + 312 = 96720
Step 311: 96720 + 312 = 97032
Step 312: 97032 + 312 = 97344
Step 313: 97344 + 312 = 97656
Step 314: 97656 + 312 = 97968
Step 315: 97968 + 312 = 98280
Step 316: 98280 + 312 = 98592
Step 317: 98592 + 312 = 98904
Step 318: 98904 + 312 = 99216
Step 319: 99216 + 312 = 99528
Step 320: 99528 + 312 = 99840
Step 321: 99840 + 312 = 100152
Step 322: 100152 + 312 = 100464
Step 323: 100464 + 312 = 100776
Step 324: 100776 + 312 = 101088
Step 325: 101088 + 312 = 101400
Step 326: 101400 + 312 = 101712
Step 327: 101712 + 312 = 102024
Step 328: 102024 + 312 = 102336
Step 329: 102336 + 312 = 102648
Step 330: 102648 + 312 = 102960
Step 331: 102960 + 312 = 103272
Step 332: 103272 + 312 = 103584
Step 333: 103584 + 312 = 103896
Step 334: 103896 + 312 = 104208
Step 335: 104208 + 312 = 104520
Step 336: 104520 + 312 = 104832
Step 337: 104832 + 312 = 105144
Step 338: 105144 + 312 = 105456
Step 339: 105456 + 312 = 105768
Step 340: 105768 + 312 = 106080
Step 341: 106080 + 312 = 106392
Step 342: 106392 + 312 = 106704
Step 343: 106704 + 312 = 107016
Step 344: 107016 + 312 = 107328
Step 345: 107328 + 312 = 107640
Step 346: 107640 + 312 = 107952
Step 347: 107952 + 312 = 108264
Step 348: 108264 + 312 = 108576
Step 349: 108576 + 312 = 108888
Step 350: 108888 + 312 = 109200
Step 351: 109200 + 312 = 109512
Step 352: 109512 + 312 = 109824
Step 353: 109824 + 312 = 110136
Step 354: 110136 + 312 = 110448
Step 355: 110448 + 312 = 110760
Step 356: 110760 + 312 = 111072
Step 357: 111072 + 312 = 111384
Step 358: 111384 + 312 = 111696
Step 359: 111696 + 312 = 112008
Step 360: 112008 + 312 = 112320
Step 361: 112320 + 312 = 112632
Step 362: 112632 + 312 = 112944
Step 363: 112944 + 312 = 113256
Step 364: 113256 + 312 = 113568
Step 365: 113568 + 312 = 113880
Step 366: 113880 + 312 = 114192
Step 367: 114192 + 312 = 114504
Step 368: 114504 + 312 = 114816
Step 369: 114816 + 312 = 115128
Step 370: 115128 + 312 = 115440
Step 371: 115440 + 312 = 115752
Step 372: 115752 + 312 = 116064
Step 373: 116064 + 312 = 116376
Step 374: 116376 + 312 = 116688
Step 375: 116688 + 312 = 117000
Step 376: 117000 + 312 = 117312
Step 377: 117312 + 312 = 117624
Step 378: 117624 + 312 = 117936
Step 379: 117936 + 312 = 118248
Step 380: 118248 + 312 = 118560
Step 381: 118560 + 312 = 118872
Step 382: 118872 + 312 = 119184
Step 383: 119184 + 312 = 119496
Step 384: 119496 + 312 = 119808
Step 385: 119808 + 312 = 120120
Step 386: 120120 + 312 = 120432
Step 387: 120432 + 312 = 120744
Step 388: 120744 + 312 = 121056
Step 389: 121056 + 312 = 121368
Step 390: 121368 + 312 = 121680
Step 391: 121680 + 312 = 121992
Step 392: 121992 + 312 = 122304
Step 393: 122304 + 312 = 122616
Step 394: 122616 + 312 = 122928
Step 395: 122928 + 312 = 123240
Step 396: 123240 + 312 = 123552
Step 397: 123552 + 312 = 123864
Step 398: 123864 + 312 = 124176
Step 399: 124176 + 312 = 124488
Step 400: 124488 + 312 = 124800
Step 401: 124800 + 312 = 125112
Step 402: 125112 + 312 = 125424
Step 403: 125424 + 312 = 125736
Step 404: 125736 + 312 = 126048
Step 405: 126048 + 312 = 126360
Step 406: 126360 + 312 = 126672
Step 407: 126672 + 312 = 126984
Step 408: 126984 + 312 = 127296
Step 409: 127296 + 312 = 127608
Step 410: 127608 + 312 = 127920
Step 411: 127920 + 312 = 128232
Step 412: 128232 + 312 = 128544
Step 413: 128544 + 312 = 128856
Step 414: 128856 + 312 = 129168
Step 415: 129168 + 312 = 129480
Step 416: 129480 + 312 = 129792
Step 417: 129792 + 312 = 130104
Step 418: 130104 + 312 = 130416
Step 419: 130416 + 312 = 130728
Step 420: 130728 + 312 = 131040
Step 421: 131040 + 312 = 131352
Step 422: 131352 + 312 = 131664
Step 423: 131664 + 312 = 131976
Step 424: 131976 + 312 = 132288
Step 425: 132288 + 312 = 132600
Step 426: 132600 + 312 = 132912
Step 427: 132912 + 312 = 133224
Step 428: 133224 + 312 = 133536
Step 429: 133536 + 312 = 133848
Step 430: 133848 + 312 = 134160
Step 431: 134160 + 312 = 134472
Step 432: 134472 + 312 = 134784
Step 433: 134784 + 312 = 135096
Step 434: 135096 + 312 = 135408
Step 435: 135408 + 312 = 135720
Step 436: 135720 + 312 = 136032
Step 437: 136032 + 312 = 136344
Step 438: 136344 + 312 = 136656
Step 439: 136656 + 312 = 136968
Step 440: 136968 + 312 = 137280
Step 441: 137280 + 312 = 137592
Step 442: 137592 + 312 = 137904
Step 443: 137904 + 312 = 138216
Step 444: 138216 + 312 = 138528
Step 445: 138528 + 312 = 138840
Step 446: 138840 + 312 = 139152
Step 447: 139152 + 312 = 139464
Step 448: 139464 + 312 = 139776
Step 449: 139776 + 312 = 140088
Step 450: 140088 + 312 = 140400
Step 451: 140400 + 312 = 140712
Step 452: 140712 + 312 = 141024
Step 453: 141024 + 312 = 141336
Step 454: 141336 + 312 = 141648
Step 455: 141648 + 312 = 141960
Step 456: 141960 + 312 = 142272
Step 457: 142272 + 312 = 142584
Step 458: 142584 + 312 = 142896
Step 459: 142896 + 312 = 143208
Step 460: 143208 + 312 = 143520
Step 461: 143520 + 312 = 143832
Step 462: 143832 + 312 = 144144
Step 463: 144144 + 312 = 144456
Step 464: 144456 + 312 = 144768
Step 465: 144768 + 312 = 145080
Step 466: 145080 + 312 = 145392
Step 467: 145392 + 312 = 145704
Step 468: 145704 + 312 = 146016
Step 469: 146016 + 312 = 146328
Step 470: 146328 + 312 = 146640
Step 471: 146640 + 312 = 146952
Step 472: 146952 + 312 = 147264
Step 473: 147264 + 312 = 147576
Step 474: 147576 + 312 = 147888
Step 475: 147888 + 312 = 148200
Step 476: 148200 + 312 = 148512
Step 477: 148512 + 312 = 148824
Step 478: 148824 + 312 = 149136
Step 479: 149136 + 312 = 149448
Step 480: 149448 + 312 = 149760
Step 481: 149760 + 312 = 150072
Step 482: 150072 + 312 = 150384
Step 483: 150384 + 312 = 150696
Step 484: 150696 + 312 = 151008
Step 485: 151008 + 312 = 151320
Step 486: 151320 + 312 = 151632
Step 487: 151632 + 312 = 151944
Step 488: 151944 + 312 = 152256
Step 489: 152256 + 312 = 152568
Step 490: 152568 + 312 = 152880

So, 312*490 = 152880