Sure thing, let's get straight to it. We start with 990 and we're going to multiply it by 485, which means adding 990 to itself 485 times.
Step 1: 0 + 990 = 990
Step 2: 990 + 990 = 1980
Step 3: 1980 + 990 = 2970
Step 4: 2970 + 990 = 3960
Step 5: 3960 + 990 = 4950
Step 6: 4950 + 990 = 5940
Step 7: 5940 + 990 = 6930
Step 8: 6930 + 990 = 7920
Step 9: 7920 + 990 = 8910
Step 10: 8910 + 990 = 9900
Step 11: 9900 + 990 = 10890
Step 12: 10890 + 990 = 11880
Step 13: 11880 + 990 = 12870
Step 14: 12870 + 990 = 13860
Step 15: 13860 + 990 = 14850
Step 16: 14850 + 990 = 15840
Step 17: 15840 + 990 = 16830
Step 18: 16830 + 990 = 17820
Step 19: 17820 + 990 = 18810
Step 20: 18810 + 990 = 19800
Step 21: 19800 + 990 = 20790
Step 22: 20790 + 990 = 21780
Step 23: 21780 + 990 = 22770
Step 24: 22770 + 990 = 23760
Step 25: 23760 + 990 = 24750
Step 26: 24750 + 990 = 25740
Step 27: 25740 + 990 = 26730
Step 28: 26730 + 990 = 27720
Step 29: 27720 + 990 = 28710
Step 30: 28710 + 990 = 29700
Step 31: 29700 + 990 = 30690
Step 32: 30690 + 990 = 31680
Step 33: 31680 + 990 = 32670
Step 34: 32670 + 990 = 33660
Step 35: 33660 + 990 = 34650
Step 36: 34650 + 990 = 35640
Step 37: 35640 + 990 = 36630
Step 38: 36630 + 990 = 37620
Step 39: 37620 + 990 = 38610
Step 40: 38610 + 990 = 39600
Step 41: 39600 + 990 = 40590
Step 42: 40590 + 990 = 41580
Step 43: 41580 + 990 = 42570
Step 44: 42570 + 990 = 43560
Step 45: 43560 + 990 = 44550
Step 46: 44550 + 990 = 45540
Step 47: 45540 + 990 = 46530
Step 48: 46530 + 990 = 47520
Step 49: 47520 + 990 = 48510
Step 50: 48510 + 990 = 49500
Step 51: 49500 + 990 = 50490
Step 52: 50490 + 990 = 51480
Step 53: 51480 + 990 = 52470
Step 54: 52470 + 990 = 53460
Step 55: 53460 + 990 = 54450
Step 56: 54450 + 990 = 55440
Step 57: 55440 + 990 = 56430
Step 58: 56430 + 990 = 57420
Step 59: 57420 + 990 = 58410
Step 60: 58410 + 990 = 59400
Step 61: 59400 + 990 = 60390
Step 62: 60390 + 990 = 61380
Step 63: 61380 + 990 = 62370
Step 64: 62370 + 990 = 63360
Step 65: 63360 + 990 = 64350
Step 66: 64350 + 990 = 65340
Step 67: 65340 + 990 = 66330
Step 68: 66330 + 990 = 67320
Step 69: 67320 + 990 = 68310
Step 70: 68310 + 990 = 69300
Step 71: 69300 + 990 = 70290
Step 72: 70290 + 990 = 71280
Step 73: 71280 + 990 = 72270
Step 74: 72270 + 990 = 73260
Step 75: 73260 + 990 = 74250
Step 76: 74250 + 990 = 75240
Step 77: 75240 + 990 = 76230
Step 78: 76230 + 990 = 77220
Step 79: 77220 + 990 = 78210
Step 80: 78210 + 990 = 79200
Step 81: 79200 + 990 = 80190
Step 82: 80190 + 990 = 81180
Step 83: 81180 + 990 = 82170
Step 84: 82170 + 990 = 83160
Step 85: 83160 + 990 = 84150
Step 86: 84150 + 990 = 85140
Step 87: 85140 + 990 = 86130
Step 88: 86130 + 990 = 87120
Step 89: 87120 + 990 = 88110
Step 90: 88110 + 990 = 89100
Step 91: 89100 + 990 = 90090
Step 92: 90090 + 990 = 91080
Step 93: 91080 + 990 = 92070
Step 94: 92070 + 990 = 93060
Step 95: 93060 + 990 = 94050
Step 96: 94050 + 990 = 95040
Step 97: 95040 + 990 = 96030
Step 98: 96030 + 990 = 97020
Step 99: 97020 + 990 = 98010
Step 100: 98010 + 990 = 99000
Step 101: 99000 + 990 = 99990
Step 102: 99990 + 990 = 100980
Step 103: 100980 + 990 = 101970
Step 104: 101970 + 990 = 102960
Step 105: 102960 + 990 = 103950
Step 106: 103950 + 990 = 104940
Step 107: 104940 + 990 = 105930
Step 108: 105930 + 990 = 106920
Step 109: 106920 + 990 = 107910
Step 110: 107910 + 990 = 108900
Step 111: 108900 + 990 = 109890
Step 112: 109890 + 990 = 110880
Step 113: 110880 + 990 = 111870
Step 114: 111870 + 990 = 112860
Step 115: 112860 + 990 = 113850
Step 116: 113850 + 990 = 114840
Step 117: 114840 + 990 = 115830
Step 118: 115830 + 990 = 116820
Step 119: 116820 + 990 = 117810
Step 120: 117810 + 990 = 118800
Step 121: 118800 + 990 = 119790
Step 122: 119790 + 990 = 120780
Step 123: 120780 + 990 = 121770
Step 124: 121770 + 990 = 122760
Step 125: 122760 + 990 = 123750
Step 126: 123750 + 990 = 124740
Step 127: 124740 + 990 = 125730
Step 128: 125730 + 990 = 126720
Step 129: 126720 + 990 = 127710
Step 130: 127710 + 990 = 128700
Step 131: 128700 + 990 = 129690
Step 132: 129690 + 990 = 130680
Step 133: 130680 + 990 = 131670
Step 134: 131670 + 990 = 132660
Step 135: 132660 + 990 = 133650
Step 136: 133650 + 990 = 134640
Step 137: 134640 + 990 = 135630
Step 138: 135630 + 990 = 136620
Step 139: 136620 + 990 = 137610
Step 140: 137610 + 990 = 138600
Step 141: 138600 + 990 = 139590
Step 142: 139590 + 990 = 140580
Step 143: 140580 + 990 = 141570
Step 144: 141570 + 990 = 142560
Step 145: 142560 + 990 = 143550
Step 146: 143550 + 990 = 144540
Step 147: 144540 + 990 = 145530
Step 148: 145530 + 990 = 146520
Step 149: 146520 + 990 = 147510
Step 150: 147510 + 990 = 148500
Step 151: 148500 + 990 = 149490
Step 152: 149490 + 990 = 150480
Step 153: 150480 + 990 = 151470
Step 154: 151470 + 990 = 152460
Step 155: 152460 + 990 = 153450
Step 156: 153450 + 990 = 154440
Step 157: 154440 + 990 = 155430
Step 158: 155430 + 990 = 156420
Step 159: 156420 + 990 = 157410
Step 160: 157410 + 990 = 158400
Step 161: 158400 + 990 = 159390
Step 162: 159390 + 990 = 160380
Step 163: 160380 + 990 = 161370
Step 164: 161370 + 990 = 162360
Step 165: 162360 + 990 = 163350
Step 166: 163350 + 990 = 164340
Step 167: 164340 + 990 = 165330
Step 168: 165330 + 990 = 166320
Step 169: 166320 + 990 = 167310
Step 170: 167310 + 990 = 168300
Step 171: 168300 + 990 = 169290
Step 172: 169290 + 990 = 170280
Step 173: 170280 + 990 = 171270
Step 174: 171270 + 990 = 172260
Step 175: 172260 + 990 = 173250
Step 176: 173250 + 990 = 174240
Step 177: 174240 + 990 = 175230
Step 178: 175230 + 990 = 176220
Step 179: 176220 + 990 = 177210
Step 180: 177210 + 990 = 178200
Step 181: 178200 + 990 = 179190
Step 182: 179190 + 990 = 180180
Step 183: 180180 + 990 = 181170
Step 184: 181170 + 990 = 182160
Step 185: 182160 + 990 = 183150
Step 186: 183150 + 990 = 184140
Step 187: 184140 + 990 = 185130
Step 188: 185130 + 990 = 186120
Step 189: 186120 + 990 = 187110
Step 190: 187110 + 990 = 188100
Step 191: 188100 + 990 = 189090
Step 192: 189090 + 990 = 190080
Step 193: 190080 + 990 = 191070
Step 194: 191070 + 990 = 192060
Step 195: 192060 + 990 = 193050
Step 196: 193050 + 990 = 194040
Step 197: 194040 + 990 = 195030
Step 198: 195030 + 990 = 196020
Step 199: 196020 + 990 = 197010
Step 200: 197010 + 990 = 198000
Step 201: 198000 + 990 = 198990
Step 202: 198990 + 990 = 199980
Step 203: 199980 + 990 = 200970
Step 204: 200970 + 990 = 201960
Step 205: 201960 + 990 = 202950
Step 206: 202950 + 990 = 203940
Step 207: 203940 + 990 = 204930
Step 208: 204930 + 990 = 205920
Step 209: 205920 + 990 = 206910
Step 210: 206910 + 990 = 207900
Step 211: 207900 + 990 = 208890
Step 212: 208890 + 990 = 209880
Step 213: 209880 + 990 = 210870
Step 214: 210870 + 990 = 211860
Step 215: 211860 + 990 = 212850
Step 216: 212850 + 990 = 213840
Step 217: 213840 + 990 = 214830
Step 218: 214830 + 990 = 215820
Step 219: 215820 + 990 = 216810
Step 220: 216810 + 990 = 217800
Step 221: 217800 + 990 = 218790
Step 222: 218790 + 990 = 219780
Step 223: 219780 + 990 = 220770
Step 224: 220770 + 990 = 221760
Step 225: 221760 + 990 = 222750
Step 226: 222750 + 990 = 223740
Step 227: 223740 + 990 = 224730
Step 228: 224730 + 990 = 225720
Step 229: 225720 + 990 = 226710
Step 230: 226710 + 990 = 227700
Step 231: 227700 + 990 = 228690
Step 232: 228690 + 990 = 229680
Step 233: 229680 + 990 = 230670
Step 234: 230670 + 990 = 231660
Step 235: 231660 + 990 = 232650
Step 236: 232650 + 990 = 233640
Step 237: 233640 + 990 = 234630
Step 238: 234630 + 990 = 235620
Step 239: 235620 + 990 = 236610
Step 240: 236610 + 990 = 237600
Step 241: 237600 + 990 = 238590
Step 242: 238590 + 990 = 239580
Step 243: 239580 + 990 = 240570
Step 244: 240570 + 990 = 241560
Step 245: 241560 + 990 = 242550
Step 246: 242550 + 990 = 243540
Step 247: 243540 + 990 = 244530
Step 248: 244530 + 990 = 245520
Step 249: 245520 + 990 = 246510
Step 250: 246510 + 990 = 247500
Step 251: 247500 + 990 = 248490
Step 252: 248490 + 990 = 249480
Step 253: 249480 + 990 = 250470
Step 254: 250470 + 990 = 251460
Step 255: 251460 + 990 = 252450
Step 256: 252450 + 990 = 253440
Step 257: 253440 + 990 = 254430
Step 258: 254430 + 990 = 255420
Step 259: 255420 + 990 = 256410
Step 260: 256410 + 990 = 257400
Step 261: 257400 + 990 = 258390
Step 262: 258390 + 990 = 259380
Step 263: 259380 + 990 = 260370
Step 264: 260370 + 990 = 261360
Step 265: 261360 + 990 = 262350
Step 266: 262350 + 990 = 263340
Step 267: 263340 + 990 = 264330
Step 268: 264330 + 990 = 265320
Step 269: 265320 + 990 = 266310
Step 270: 266310 + 990 = 267300
Step 271: 267300 + 990 = 268290
Step 272: 268290 + 990 = 269280
Step 273: 269280 + 990 = 270270
Step 274: 270270 + 990 = 271260
Step 275: 271260 + 990 = 272250
Step 276: 272250 + 990 = 273240
Step 277: 273240 + 990 = 274230
Step 278: 274230 + 990 = 275220
Step 279: 275220 + 990 = 276210
Step 280: 276210 + 990 = 277200
Step 281: 277200 + 990 = 278190
Step 282: 278190 + 990 = 279180
Step 283: 279180 + 990 = 280170
Step 284: 280170 + 990 = 281160
Step 285: 281160 + 990 = 282150
Step 286: 282150 + 990 = 283140
Step 287: 283140 + 990 = 284130
Step 288: 284130 + 990 = 285120
Step 289: 285120 + 990 = 286110
Step 290: 286110 + 990 = 287100
Step 291: 287100 + 990 = 288090
Step 292: 288090 + 990 = 289080
Step 293: 289080 + 990 = 290070
Step 294: 290070 + 990 = 291060
Step 295: 291060 + 990 = 292050
Step 296: 292050 + 990 = 293040
Step 297: 293040 + 990 = 294030
Step 298: 294030 + 990 = 295020
Step 299: 295020 + 990 = 296010
Step 300: 296010 + 990 = 297000
Step 301: 297000 + 990 = 297990
Step 302: 297990 + 990 = 298980
Step 303: 298980 + 990 = 299970
Step 304: 299970 + 990 = 300960
Step 305: 300960 + 990 = 301950
Step 306: 301950 + 990 = 302940
Step 307: 302940 + 990 = 303930
Step 308: 303930 + 990 = 304920
Step 309: 304920 + 990 = 305910
Step 310: 305910 + 990 = 306900
Step 311: 306900 + 990 = 307890
Step 312: 307890 + 990 = 308880
Step 313: 308880 + 990 = 309870
Step 314: 309870 + 990 = 310860
Step 315: 310860 + 990 = 311850
Step 316: 311850 + 990 = 312840
Step 317: 312840 + 990 = 313830
Step 318: 313830 + 990 = 314820
Step 319: 314820 + 990 = 315810
Step 320: 315810 + 990 = 316800
Step 321: 316800 + 990 = 317790
Step 322: 317790 + 990 = 318780
Step 323: 318780 + 990 = 319770
Step 324: 319770 + 990 = 320760
Step 325: 320760 + 990 = 321750
Step 326: 321750 + 990 = 322740
Step 327: 322740 + 990 = 323730
Step 328: 323730 + 990 = 324720
Step 329: 324720 + 990 = 325710
Step 330: 325710 + 990 = 326700
Step 331: 326700 + 990 = 327690
Step 332: 327690 + 990 = 328680
Step 333: 328680 + 990 = 329670
Step 334: 329670 + 990 = 330660
Step 335: 330660 + 990 = 331650
Step 336: 331650 + 990 = 332640
Step 337: 332640 + 990 = 333630
Step 338: 333630 + 990 = 334620
Step 339: 334620 + 990 = 335610
Step 340: 335610 + 990 = 336600
Step 341: 336600 + 990 = 337590
Step 342: 337590 + 990 = 338580
Step 343: 338580 + 990 = 339570
Step 344: 339570 + 990 = 340560
Step 345: 340560 + 990 = 341550
Step 346: 341550 + 990 = 342540
Step 347: 342540 + 990 = 343530
Step 348: 343530 + 990 = 344520
Step 349: 344520 + 990 = 345510
Step 350: 345510 + 990 = 346500
Step 351: 346500 + 990 = 347490
Step 352: 347490 + 990 = 348480
Step 353: 348480 + 990 = 349470
Step 354: 349470 + 990 = 350460
Step 355: 350460 + 990 = 351450
Step 356: 351450 + 990 = 352440
Step 357: 352440 + 990 = 353430
Step 358: 353430 + 990 = 354420
Step 359: 354420 + 990 = 355410
Step 360: 355410 + 990 = 356400
Step 361: 356400 + 990 = 357390
Step 362: 357390 + 990 = 358380
Step 363: 358380 + 990 = 359370
Step 364: 359370 + 990 = 360360
Step 365: 360360 + 990 = 361350
Step 366: 361350 + 990 = 362340
Step 367: 362340 + 990 = 363330
Step 368: 363330 + 990 = 364320
Step 369: 364320 + 990 = 365310
Step 370: 365310 + 990 = 366300
Step 371: 366300 + 990 = 367290
Step 372: 367290 + 990 = 368280
Step 373: 368280 + 990 = 369270
Step 374: 369270 + 990 = 370260
Step 375: 370260 + 990 = 371250
Step 376: 371250 + 990 = 372240
Step 377: 372240 + 990 = 373230
Step 378: 373230 + 990 = 374220
Step 379: 374220 + 990 = 375210
Step 380: 375210 + 990 = 376200
Step 381: 376200 + 990 = 377190
Step 382: 377190 + 990 = 378180
Step 383: 378180 + 990 = 379170
Step 384: 379170 + 990 = 380160
Step 385: 380160 + 990 = 381150
Step 386: 381150 + 990 = 382140
Step 387: 382140 + 990 = 383130
Step 388: 383130 + 990 = 384120
Step 389: 384120 + 990 = 385110
Step 390: 385110 + 990 = 386100
Step 391: 386100 + 990 = 387090
Step 392: 387090 + 990 = 388080
Step 393: 388080 + 990 = 389070
Step 394: 389070 + 990 = 390060
Step 395: 390060 + 990 = 391050
Step 396: 391050 + 990 = 392040
Step 397: 392040 + 990 = 393030
Step 398: 393030 + 990 = 394020
Step 399: 394020 + 990 = 395010
Step 400: 395010 + 990 = 396000
Step 401: 396000 + 990 = 396990
Step 402: 396990 + 990 = 397980
Step 403: 397980 + 990 = 398970
Step 404: 398970 + 990 = 399960
Step 405: 399960 + 990 = 400950
Step 406: 400950 + 990 = 401940
Step 407: 401940 + 990 = 402930
Step 408: 402930 + 990 = 403920
Step 409: 403920 + 990 = 404910
Step 410: 404910 + 990 = 405900
Step 411: 405900 + 990 = 406890
Step 412: 406890 + 990 = 407880
Step 413: 407880 + 990 = 408870
Step 414: 408870 + 990 = 409860
Step 415: 409860 + 990 = 410850
Step 416: 410850 + 990 = 411840
Step 417: 411840 + 990 = 412830
Step 418: 412830 + 990 = 413820
Step 419: 413820 + 990 = 414810
Step 420: 414810 + 990 = 415800
Step 421: 415800 + 990 = 416790
Step 422: 416790 + 990 = 417780
Step 423: 417780 + 990 = 418770
Step 424: 418770 + 990 = 419760
Step 425: 419760 + 990 = 420750
Step 426: 420750 + 990 = 421740
Step 427: 421740 + 990 = 422730
Step 428: 422730 + 990 = 423720
Step 429: 423720 + 990 = 424710
Step 430: 424710 + 990 = 425700
Step 431: 425700 + 990 = 426690
Step 432: 426690 + 990 = 427680
Step 433: 427680 + 990 = 428670
Step 434: 428670 + 990 = 429660
Step 435: 429660 + 990 = 430650
Step 436: 430650 + 990 = 431640
Step 437: 431640 + 990 = 432630
Step 438: 432630 + 990 = 433620
Step 439: 433620 + 990 = 434610
Step 440: 434610 + 990 = 435600
Step 441: 435600 + 990 = 436590
Step 442: 436590 + 990 = 437580
Step 443: 437580 + 990 = 438570
Step 444: 438570 + 990 = 439560
Step 445: 439560 + 990 = 440550
Step 446: 440550 + 990 = 441540
Step 447: 441540 + 990 = 442530
Step 448: 442530 + 990 = 443520
Step 449: 443520 + 990 = 444510
Step 450: 444510 + 990 = 445500
Step 451: 445500 + 990 = 446490
Step 452: 446490 + 990 = 447480
Step 453: 447480 + 990 = 448470
Step 454: 448470 + 990 = 449460
Step 455: 449460 + 990 = 450450
Step 456: 450450 + 990 = 451440
Step 457: 451440 + 990 = 452430
Step 458: 452430 + 990 = 453420
Step 459: 453420 + 990 = 454410
Step 460: 454410 + 990 = 455400
Step 461: 455400 + 990 = 456390
Step 462: 456390 + 990 = 457380
Step 463: 457380 + 990 = 458370
Step 464: 458370 + 990 = 459360
Step 465: 459360 + 990 = 460350
Step 466: 460350 + 990 = 461340
Step 467: 461340 + 990 = 462330
Step 468: 462330 + 990 = 463320
Step 469: 463320 + 990 = 464310
Step 470: 464310 + 990 = 465300
Step 471: 465300 + 990 = 466290
Step 472: 466290 + 990 = 467280
Step 473: 467280 + 990 = 468270
Step 474: 468270 + 990 = 469260
Step 475: 469260 + 990 = 470250
Step 476: 470250 + 990 = 471240
Step 477: 471240 + 990 = 472230
Step 478: 472230 + 990 = 473220
Step 479: 473220 + 990 = 474210
Step 480: 474210 + 990 = 475200
Step 481: 475200 + 990 = 476190
Step 482: 476190 + 990 = 477180
Step 483: 477180 + 990 = 478170
Step 484: 478170 + 990 = 479160
Step 485: 479160 + 990 = 480150

So, 990*485 = 480150