Sure thing! We've got 320 and we're gonna multiply it by 491. That's the same as adding 320 to itself 491 times.
Step 1: 0 + 320 = 320
Step 2: 320 + 320 = 640
Step 3: 640 + 320 = 960
Step 4: 960 + 320 = 1280
Step 5: 1280 + 320 = 1600
Step 6: 1600 + 320 = 1920
Step 7: 1920 + 320 = 2240
Step 8: 2240 + 320 = 2560
Step 9: 2560 + 320 = 2880
Step 10: 2880 + 320 = 3200
Step 11: 3200 + 320 = 3520
Step 12: 3520 + 320 = 3840
Step 13: 3840 + 320 = 4160
Step 14: 4160 + 320 = 4480
Step 15: 4480 + 320 = 4800
Step 16: 4800 + 320 = 5120
Step 17: 5120 + 320 = 5440
Step 18: 5440 + 320 = 5760
Step 19: 5760 + 320 = 6080
Step 20: 6080 + 320 = 6400
Step 21: 6400 + 320 = 6720
Step 22: 6720 + 320 = 7040
Step 23: 7040 + 320 = 7360
Step 24: 7360 + 320 = 7680
Step 25: 7680 + 320 = 8000
Step 26: 8000 + 320 = 8320
Step 27: 8320 + 320 = 8640
Step 28: 8640 + 320 = 8960
Step 29: 8960 + 320 = 9280
Step 30: 9280 + 320 = 9600
Step 31: 9600 + 320 = 9920
Step 32: 9920 + 320 = 10240
Step 33: 10240 + 320 = 10560
Step 34: 10560 + 320 = 10880
Step 35: 10880 + 320 = 11200
Step 36: 11200 + 320 = 11520
Step 37: 11520 + 320 = 11840
Step 38: 11840 + 320 = 12160
Step 39: 12160 + 320 = 12480
Step 40: 12480 + 320 = 12800
Step 41: 12800 + 320 = 13120
Step 42: 13120 + 320 = 13440
Step 43: 13440 + 320 = 13760
Step 44: 13760 + 320 = 14080
Step 45: 14080 + 320 = 14400
Step 46: 14400 + 320 = 14720
Step 47: 14720 + 320 = 15040
Step 48: 15040 + 320 = 15360
Step 49: 15360 + 320 = 15680
Step 50: 15680 + 320 = 16000
Step 51: 16000 + 320 = 16320
Step 52: 16320 + 320 = 16640
Step 53: 16640 + 320 = 16960
Step 54: 16960 + 320 = 17280
Step 55: 17280 + 320 = 17600
Step 56: 17600 + 320 = 17920
Step 57: 17920 + 320 = 18240
Step 58: 18240 + 320 = 18560
Step 59: 18560 + 320 = 18880
Step 60: 18880 + 320 = 19200
Step 61: 19200 + 320 = 19520
Step 62: 19520 + 320 = 19840
Step 63: 19840 + 320 = 20160
Step 64: 20160 + 320 = 20480
Step 65: 20480 + 320 = 20800
Step 66: 20800 + 320 = 21120
Step 67: 21120 + 320 = 21440
Step 68: 21440 + 320 = 21760
Step 69: 21760 + 320 = 22080
Step 70: 22080 + 320 = 22400
Step 71: 22400 + 320 = 22720
Step 72: 22720 + 320 = 23040
Step 73: 23040 + 320 = 23360
Step 74: 23360 + 320 = 23680
Step 75: 23680 + 320 = 24000
Step 76: 24000 + 320 = 24320
Step 77: 24320 + 320 = 24640
Step 78: 24640 + 320 = 24960
Step 79: 24960 + 320 = 25280
Step 80: 25280 + 320 = 25600
Step 81: 25600 + 320 = 25920
Step 82: 25920 + 320 = 26240
Step 83: 26240 + 320 = 26560
Step 84: 26560 + 320 = 26880
Step 85: 26880 + 320 = 27200
Step 86: 27200 + 320 = 27520
Step 87: 27520 + 320 = 27840
Step 88: 27840 + 320 = 28160
Step 89: 28160 + 320 = 28480
Step 90: 28480 + 320 = 28800
Step 91: 28800 + 320 = 29120
Step 92: 29120 + 320 = 29440
Step 93: 29440 + 320 = 29760
Step 94: 29760 + 320 = 30080
Step 95: 30080 + 320 = 30400
Step 96: 30400 + 320 = 30720
Step 97: 30720 + 320 = 31040
Step 98: 31040 + 320 = 31360
Step 99: 31360 + 320 = 31680
Step 100: 31680 + 320 = 32000
Step 101: 32000 + 320 = 32320
Step 102: 32320 + 320 = 32640
Step 103: 32640 + 320 = 32960
Step 104: 32960 + 320 = 33280
Step 105: 33280 + 320 = 33600
Step 106: 33600 + 320 = 33920
Step 107: 33920 + 320 = 34240
Step 108: 34240 + 320 = 34560
Step 109: 34560 + 320 = 34880
Step 110: 34880 + 320 = 35200
Step 111: 35200 + 320 = 35520
Step 112: 35520 + 320 = 35840
Step 113: 35840 + 320 = 36160
Step 114: 36160 + 320 = 36480
Step 115: 36480 + 320 = 36800
Step 116: 36800 + 320 = 37120
Step 117: 37120 + 320 = 37440
Step 118: 37440 + 320 = 37760
Step 119: 37760 + 320 = 38080
Step 120: 38080 + 320 = 38400
Step 121: 38400 + 320 = 38720
Step 122: 38720 + 320 = 39040
Step 123: 39040 + 320 = 39360
Step 124: 39360 + 320 = 39680
Step 125: 39680 + 320 = 40000
Step 126: 40000 + 320 = 40320
Step 127: 40320 + 320 = 40640
Step 128: 40640 + 320 = 40960
Step 129: 40960 + 320 = 41280
Step 130: 41280 + 320 = 41600
Step 131: 41600 + 320 = 41920
Step 132: 41920 + 320 = 42240
Step 133: 42240 + 320 = 42560
Step 134: 42560 + 320 = 42880
Step 135: 42880 + 320 = 43200
Step 136: 43200 + 320 = 43520
Step 137: 43520 + 320 = 43840
Step 138: 43840 + 320 = 44160
Step 139: 44160 + 320 = 44480
Step 140: 44480 + 320 = 44800
Step 141: 44800 + 320 = 45120
Step 142: 45120 + 320 = 45440
Step 143: 45440 + 320 = 45760
Step 144: 45760 + 320 = 46080
Step 145: 46080 + 320 = 46400
Step 146: 46400 + 320 = 46720
Step 147: 46720 + 320 = 47040
Step 148: 47040 + 320 = 47360
Step 149: 47360 + 320 = 47680
Step 150: 47680 + 320 = 48000
Step 151: 48000 + 320 = 48320
Step 152: 48320 + 320 = 48640
Step 153: 48640 + 320 = 48960
Step 154: 48960 + 320 = 49280
Step 155: 49280 + 320 = 49600
Step 156: 49600 + 320 = 49920
Step 157: 49920 + 320 = 50240
Step 158: 50240 + 320 = 50560
Step 159: 50560 + 320 = 50880
Step 160: 50880 + 320 = 51200
Step 161: 51200 + 320 = 51520
Step 162: 51520 + 320 = 51840
Step 163: 51840 + 320 = 52160
Step 164: 52160 + 320 = 52480
Step 165: 52480 + 320 = 52800
Step 166: 52800 + 320 = 53120
Step 167: 53120 + 320 = 53440
Step 168: 53440 + 320 = 53760
Step 169: 53760 + 320 = 54080
Step 170: 54080 + 320 = 54400
Step 171: 54400 + 320 = 54720
Step 172: 54720 + 320 = 55040
Step 173: 55040 + 320 = 55360
Step 174: 55360 + 320 = 55680
Step 175: 55680 + 320 = 56000
Step 176: 56000 + 320 = 56320
Step 177: 56320 + 320 = 56640
Step 178: 56640 + 320 = 56960
Step 179: 56960 + 320 = 57280
Step 180: 57280 + 320 = 57600
Step 181: 57600 + 320 = 57920
Step 182: 57920 + 320 = 58240
Step 183: 58240 + 320 = 58560
Step 184: 58560 + 320 = 58880
Step 185: 58880 + 320 = 59200
Step 186: 59200 + 320 = 59520
Step 187: 59520 + 320 = 59840
Step 188: 59840 + 320 = 60160
Step 189: 60160 + 320 = 60480
Step 190: 60480 + 320 = 60800
Step 191: 60800 + 320 = 61120
Step 192: 61120 + 320 = 61440
Step 193: 61440 + 320 = 61760
Step 194: 61760 + 320 = 62080
Step 195: 62080 + 320 = 62400
Step 196: 62400 + 320 = 62720
Step 197: 62720 + 320 = 63040
Step 198: 63040 + 320 = 63360
Step 199: 63360 + 320 = 63680
Step 200: 63680 + 320 = 64000
Step 201: 64000 + 320 = 64320
Step 202: 64320 + 320 = 64640
Step 203: 64640 + 320 = 64960
Step 204: 64960 + 320 = 65280
Step 205: 65280 + 320 = 65600
Step 206: 65600 + 320 = 65920
Step 207: 65920 + 320 = 66240
Step 208: 66240 + 320 = 66560
Step 209: 66560 + 320 = 66880
Step 210: 66880 + 320 = 67200
Step 211: 67200 + 320 = 67520
Step 212: 67520 + 320 = 67840
Step 213: 67840 + 320 = 68160
Step 214: 68160 + 320 = 68480
Step 215: 68480 + 320 = 68800
Step 216: 68800 + 320 = 69120
Step 217: 69120 + 320 = 69440
Step 218: 69440 + 320 = 69760
Step 219: 69760 + 320 = 70080
Step 220: 70080 + 320 = 70400
Step 221: 70400 + 320 = 70720
Step 222: 70720 + 320 = 71040
Step 223: 71040 + 320 = 71360
Step 224: 71360 + 320 = 71680
Step 225: 71680 + 320 = 72000
Step 226: 72000 + 320 = 72320
Step 227: 72320 + 320 = 72640
Step 228: 72640 + 320 = 72960
Step 229: 72960 + 320 = 73280
Step 230: 73280 + 320 = 73600
Step 231: 73600 + 320 = 73920
Step 232: 73920 + 320 = 74240
Step 233: 74240 + 320 = 74560
Step 234: 74560 + 320 = 74880
Step 235: 74880 + 320 = 75200
Step 236: 75200 + 320 = 75520
Step 237: 75520 + 320 = 75840
Step 238: 75840 + 320 = 76160
Step 239: 76160 + 320 = 76480
Step 240: 76480 + 320 = 76800
Step 241: 76800 + 320 = 77120
Step 242: 77120 + 320 = 77440
Step 243: 77440 + 320 = 77760
Step 244: 77760 + 320 = 78080
Step 245: 78080 + 320 = 78400
Step 246: 78400 + 320 = 78720
Step 247: 78720 + 320 = 79040
Step 248: 79040 + 320 = 79360
Step 249: 79360 + 320 = 79680
Step 250: 79680 + 320 = 80000
Step 251: 80000 + 320 = 80320
Step 252: 80320 + 320 = 80640
Step 253: 80640 + 320 = 80960
Step 254: 80960 + 320 = 81280
Step 255: 81280 + 320 = 81600
Step 256: 81600 + 320 = 81920
Step 257: 81920 + 320 = 82240
Step 258: 82240 + 320 = 82560
Step 259: 82560 + 320 = 82880
Step 260: 82880 + 320 = 83200
Step 261: 83200 + 320 = 83520
Step 262: 83520 + 320 = 83840
Step 263: 83840 + 320 = 84160
Step 264: 84160 + 320 = 84480
Step 265: 84480 + 320 = 84800
Step 266: 84800 + 320 = 85120
Step 267: 85120 + 320 = 85440
Step 268: 85440 + 320 = 85760
Step 269: 85760 + 320 = 86080
Step 270: 86080 + 320 = 86400
Step 271: 86400 + 320 = 86720
Step 272: 86720 + 320 = 87040
Step 273: 87040 + 320 = 87360
Step 274: 87360 + 320 = 87680
Step 275: 87680 + 320 = 88000
Step 276: 88000 + 320 = 88320
Step 277: 88320 + 320 = 88640
Step 278: 88640 + 320 = 88960
Step 279: 88960 + 320 = 89280
Step 280: 89280 + 320 = 89600
Step 281: 89600 + 320 = 89920
Step 282: 89920 + 320 = 90240
Step 283: 90240 + 320 = 90560
Step 284: 90560 + 320 = 90880
Step 285: 90880 + 320 = 91200
Step 286: 91200 + 320 = 91520
Step 287: 91520 + 320 = 91840
Step 288: 91840 + 320 = 92160
Step 289: 92160 + 320 = 92480
Step 290: 92480 + 320 = 92800
Step 291: 92800 + 320 = 93120
Step 292: 93120 + 320 = 93440
Step 293: 93440 + 320 = 93760
Step 294: 93760 + 320 = 94080
Step 295: 94080 + 320 = 94400
Step 296: 94400 + 320 = 94720
Step 297: 94720 + 320 = 95040
Step 298: 95040 + 320 = 95360
Step 299: 95360 + 320 = 95680
Step 300: 95680 + 320 = 96000
Step 301: 96000 + 320 = 96320
Step 302: 96320 + 320 = 96640
Step 303: 96640 + 320 = 96960
Step 304: 96960 + 320 = 97280
Step 305: 97280 + 320 = 97600
Step 306: 97600 + 320 = 97920
Step 307: 97920 + 320 = 98240
Step 308: 98240 + 320 = 98560
Step 309: 98560 + 320 = 98880
Step 310: 98880 + 320 = 99200
Step 311: 99200 + 320 = 99520
Step 312: 99520 + 320 = 99840
Step 313: 99840 + 320 = 100160
Step 314: 100160 + 320 = 100480
Step 315: 100480 + 320 = 100800
Step 316: 100800 + 320 = 101120
Step 317: 101120 + 320 = 101440
Step 318: 101440 + 320 = 101760
Step 319: 101760 + 320 = 102080
Step 320: 102080 + 320 = 102400
Step 321: 102400 + 320 = 102720
Step 322: 102720 + 320 = 103040
Step 323: 103040 + 320 = 103360
Step 324: 103360 + 320 = 103680
Step 325: 103680 + 320 = 104000
Step 326: 104000 + 320 = 104320
Step 327: 104320 + 320 = 104640
Step 328: 104640 + 320 = 104960
Step 329: 104960 + 320 = 105280
Step 330: 105280 + 320 = 105600
Step 331: 105600 + 320 = 105920
Step 332: 105920 + 320 = 106240
Step 333: 106240 + 320 = 106560
Step 334: 106560 + 320 = 106880
Step 335: 106880 + 320 = 107200
Step 336: 107200 + 320 = 107520
Step 337: 107520 + 320 = 107840
Step 338: 107840 + 320 = 108160
Step 339: 108160 + 320 = 108480
Step 340: 108480 + 320 = 108800
Step 341: 108800 + 320 = 109120
Step 342: 109120 + 320 = 109440
Step 343: 109440 + 320 = 109760
Step 344: 109760 + 320 = 110080
Step 345: 110080 + 320 = 110400
Step 346: 110400 + 320 = 110720
Step 347: 110720 + 320 = 111040
Step 348: 111040 + 320 = 111360
Step 349: 111360 + 320 = 111680
Step 350: 111680 + 320 = 112000
Step 351: 112000 + 320 = 112320
Step 352: 112320 + 320 = 112640
Step 353: 112640 + 320 = 112960
Step 354: 112960 + 320 = 113280
Step 355: 113280 + 320 = 113600
Step 356: 113600 + 320 = 113920
Step 357: 113920 + 320 = 114240
Step 358: 114240 + 320 = 114560
Step 359: 114560 + 320 = 114880
Step 360: 114880 + 320 = 115200
Step 361: 115200 + 320 = 115520
Step 362: 115520 + 320 = 115840
Step 363: 115840 + 320 = 116160
Step 364: 116160 + 320 = 116480
Step 365: 116480 + 320 = 116800
Step 366: 116800 + 320 = 117120
Step 367: 117120 + 320 = 117440
Step 368: 117440 + 320 = 117760
Step 369: 117760 + 320 = 118080
Step 370: 118080 + 320 = 118400
Step 371: 118400 + 320 = 118720
Step 372: 118720 + 320 = 119040
Step 373: 119040 + 320 = 119360
Step 374: 119360 + 320 = 119680
Step 375: 119680 + 320 = 120000
Step 376: 120000 + 320 = 120320
Step 377: 120320 + 320 = 120640
Step 378: 120640 + 320 = 120960
Step 379: 120960 + 320 = 121280
Step 380: 121280 + 320 = 121600
Step 381: 121600 + 320 = 121920
Step 382: 121920 + 320 = 122240
Step 383: 122240 + 320 = 122560
Step 384: 122560 + 320 = 122880
Step 385: 122880 + 320 = 123200
Step 386: 123200 + 320 = 123520
Step 387: 123520 + 320 = 123840
Step 388: 123840 + 320 = 124160
Step 389: 124160 + 320 = 124480
Step 390: 124480 + 320 = 124800
Step 391: 124800 + 320 = 125120
Step 392: 125120 + 320 = 125440
Step 393: 125440 + 320 = 125760
Step 394: 125760 + 320 = 126080
Step 395: 126080 + 320 = 126400
Step 396: 126400 + 320 = 126720
Step 397: 126720 + 320 = 127040
Step 398: 127040 + 320 = 127360
Step 399: 127360 + 320 = 127680
Step 400: 127680 + 320 = 128000
Step 401: 128000 + 320 = 128320
Step 402: 128320 + 320 = 128640
Step 403: 128640 + 320 = 128960
Step 404: 128960 + 320 = 129280
Step 405: 129280 + 320 = 129600
Step 406: 129600 + 320 = 129920
Step 407: 129920 + 320 = 130240
Step 408: 130240 + 320 = 130560
Step 409: 130560 + 320 = 130880
Step 410: 130880 + 320 = 131200
Step 411: 131200 + 320 = 131520
Step 412: 131520 + 320 = 131840
Step 413: 131840 + 320 = 132160
Step 414: 132160 + 320 = 132480
Step 415: 132480 + 320 = 132800
Step 416: 132800 + 320 = 133120
Step 417: 133120 + 320 = 133440
Step 418: 133440 + 320 = 133760
Step 419: 133760 + 320 = 134080
Step 420: 134080 + 320 = 134400
Step 421: 134400 + 320 = 134720
Step 422: 134720 + 320 = 135040
Step 423: 135040 + 320 = 135360
Step 424: 135360 + 320 = 135680
Step 425: 135680 + 320 = 136000
Step 426: 136000 + 320 = 136320
Step 427: 136320 + 320 = 136640
Step 428: 136640 + 320 = 136960
Step 429: 136960 + 320 = 137280
Step 430: 137280 + 320 = 137600
Step 431: 137600 + 320 = 137920
Step 432: 137920 + 320 = 138240
Step 433: 138240 + 320 = 138560
Step 434: 138560 + 320 = 138880
Step 435: 138880 + 320 = 139200
Step 436: 139200 + 320 = 139520
Step 437: 139520 + 320 = 139840
Step 438: 139840 + 320 = 140160
Step 439: 140160 + 320 = 140480
Step 440: 140480 + 320 = 140800
Step 441: 140800 + 320 = 141120
Step 442: 141120 + 320 = 141440
Step 443: 141440 + 320 = 141760
Step 444: 141760 + 320 = 142080
Step 445: 142080 + 320 = 142400
Step 446: 142400 + 320 = 142720
Step 447: 142720 + 320 = 143040
Step 448: 143040 + 320 = 143360
Step 449: 143360 + 320 = 143680
Step 450: 143680 + 320 = 144000
Step 451: 144000 + 320 = 144320
Step 452: 144320 + 320 = 144640
Step 453: 144640 + 320 = 144960
Step 454: 144960 + 320 = 145280
Step 455: 145280 + 320 = 145600
Step 456: 145600 + 320 = 145920
Step 457: 145920 + 320 = 146240
Step 458: 146240 + 320 = 146560
Step 459: 146560 + 320 = 146880
Step 460: 146880 + 320 = 147200
Step 461: 147200 + 320 = 147520
Step 462: 147520 + 320 = 147840
Step 463: 147840 + 320 = 148160
Step 464: 148160 + 320 = 148480
Step 465: 148480 + 320 = 148800
Step 466: 148800 + 320 = 149120
Step 467: 149120 + 320 = 149440
Step 468: 149440 + 320 = 149760
Step 469: 149760 + 320 = 150080
Step 470: 150080 + 320 = 150400
Step 471: 150400 + 320 = 150720
Step 472: 150720 + 320 = 151040
Step 473: 151040 + 320 = 151360
Step 474: 151360 + 320 = 151680
Step 475: 151680 + 320 = 152000
Step 476: 152000 + 320 = 152320
Step 477: 152320 + 320 = 152640
Step 478: 152640 + 320 = 152960
Step 479: 152960 + 320 = 153280
Step 480: 153280 + 320 = 153600
Step 481: 153600 + 320 = 153920
Step 482: 153920 + 320 = 154240
Step 483: 154240 + 320 = 154560
Step 484: 154560 + 320 = 154880
Step 485: 154880 + 320 = 155200
Step 486: 155200 + 320 = 155520
Step 487: 155520 + 320 = 155840
Step 488: 155840 + 320 = 156160
Step 489: 156160 + 320 = 156480
Step 490: 156480 + 320 = 156800
Step 491: 156800 + 320 = 157120

So, 320*491 = 157120