Alright, let's solve this math problem step by step. First, we have the number 890. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 321. So, we're going to take the number 890 and add it to itself 321 times.
Step 1: 0 + 890 = 890
Step 2: 890 + 890 = 1780
Step 3: 1780 + 890 = 2670
Step 4: 2670 + 890 = 3560
Step 5: 3560 + 890 = 4450
Step 6: 4450 + 890 = 5340
Step 7: 5340 + 890 = 6230
Step 8: 6230 + 890 = 7120
Step 9: 7120 + 890 = 8010
Step 10: 8010 + 890 = 8900
Step 11: 8900 + 890 = 9790
Step 12: 9790 + 890 = 10680
Step 13: 10680 + 890 = 11570
Step 14: 11570 + 890 = 12460
Step 15: 12460 + 890 = 13350
Step 16: 13350 + 890 = 14240
Step 17: 14240 + 890 = 15130
Step 18: 15130 + 890 = 16020
Step 19: 16020 + 890 = 16910
Step 20: 16910 + 890 = 17800
Step 21: 17800 + 890 = 18690
Step 22: 18690 + 890 = 19580
Step 23: 19580 + 890 = 20470
Step 24: 20470 + 890 = 21360
Step 25: 21360 + 890 = 22250
Step 26: 22250 + 890 = 23140
Step 27: 23140 + 890 = 24030
Step 28: 24030 + 890 = 24920
Step 29: 24920 + 890 = 25810
Step 30: 25810 + 890 = 26700
Step 31: 26700 + 890 = 27590
Step 32: 27590 + 890 = 28480
Step 33: 28480 + 890 = 29370
Step 34: 29370 + 890 = 30260
Step 35: 30260 + 890 = 31150
Step 36: 31150 + 890 = 32040
Step 37: 32040 + 890 = 32930
Step 38: 32930 + 890 = 33820
Step 39: 33820 + 890 = 34710
Step 40: 34710 + 890 = 35600
Step 41: 35600 + 890 = 36490
Step 42: 36490 + 890 = 37380
Step 43: 37380 + 890 = 38270
Step 44: 38270 + 890 = 39160
Step 45: 39160 + 890 = 40050
Step 46: 40050 + 890 = 40940
Step 47: 40940 + 890 = 41830
Step 48: 41830 + 890 = 42720
Step 49: 42720 + 890 = 43610
Step 50: 43610 + 890 = 44500
Step 51: 44500 + 890 = 45390
Step 52: 45390 + 890 = 46280
Step 53: 46280 + 890 = 47170
Step 54: 47170 + 890 = 48060
Step 55: 48060 + 890 = 48950
Step 56: 48950 + 890 = 49840
Step 57: 49840 + 890 = 50730
Step 58: 50730 + 890 = 51620
Step 59: 51620 + 890 = 52510
Step 60: 52510 + 890 = 53400
Step 61: 53400 + 890 = 54290
Step 62: 54290 + 890 = 55180
Step 63: 55180 + 890 = 56070
Step 64: 56070 + 890 = 56960
Step 65: 56960 + 890 = 57850
Step 66: 57850 + 890 = 58740
Step 67: 58740 + 890 = 59630
Step 68: 59630 + 890 = 60520
Step 69: 60520 + 890 = 61410
Step 70: 61410 + 890 = 62300
Step 71: 62300 + 890 = 63190
Step 72: 63190 + 890 = 64080
Step 73: 64080 + 890 = 64970
Step 74: 64970 + 890 = 65860
Step 75: 65860 + 890 = 66750
Step 76: 66750 + 890 = 67640
Step 77: 67640 + 890 = 68530
Step 78: 68530 + 890 = 69420
Step 79: 69420 + 890 = 70310
Step 80: 70310 + 890 = 71200
Step 81: 71200 + 890 = 72090
Step 82: 72090 + 890 = 72980
Step 83: 72980 + 890 = 73870
Step 84: 73870 + 890 = 74760
Step 85: 74760 + 890 = 75650
Step 86: 75650 + 890 = 76540
Step 87: 76540 + 890 = 77430
Step 88: 77430 + 890 = 78320
Step 89: 78320 + 890 = 79210
Step 90: 79210 + 890 = 80100
Step 91: 80100 + 890 = 80990
Step 92: 80990 + 890 = 81880
Step 93: 81880 + 890 = 82770
Step 94: 82770 + 890 = 83660
Step 95: 83660 + 890 = 84550
Step 96: 84550 + 890 = 85440
Step 97: 85440 + 890 = 86330
Step 98: 86330 + 890 = 87220
Step 99: 87220 + 890 = 88110
Step 100: 88110 + 890 = 89000
Step 101: 89000 + 890 = 89890
Step 102: 89890 + 890 = 90780
Step 103: 90780 + 890 = 91670
Step 104: 91670 + 890 = 92560
Step 105: 92560 + 890 = 93450
Step 106: 93450 + 890 = 94340
Step 107: 94340 + 890 = 95230
Step 108: 95230 + 890 = 96120
Step 109: 96120 + 890 = 97010
Step 110: 97010 + 890 = 97900
Step 111: 97900 + 890 = 98790
Step 112: 98790 + 890 = 99680
Step 113: 99680 + 890 = 100570
Step 114: 100570 + 890 = 101460
Step 115: 101460 + 890 = 102350
Step 116: 102350 + 890 = 103240
Step 117: 103240 + 890 = 104130
Step 118: 104130 + 890 = 105020
Step 119: 105020 + 890 = 105910
Step 120: 105910 + 890 = 106800
Step 121: 106800 + 890 = 107690
Step 122: 107690 + 890 = 108580
Step 123: 108580 + 890 = 109470
Step 124: 109470 + 890 = 110360
Step 125: 110360 + 890 = 111250
Step 126: 111250 + 890 = 112140
Step 127: 112140 + 890 = 113030
Step 128: 113030 + 890 = 113920
Step 129: 113920 + 890 = 114810
Step 130: 114810 + 890 = 115700
Step 131: 115700 + 890 = 116590
Step 132: 116590 + 890 = 117480
Step 133: 117480 + 890 = 118370
Step 134: 118370 + 890 = 119260
Step 135: 119260 + 890 = 120150
Step 136: 120150 + 890 = 121040
Step 137: 121040 + 890 = 121930
Step 138: 121930 + 890 = 122820
Step 139: 122820 + 890 = 123710
Step 140: 123710 + 890 = 124600
Step 141: 124600 + 890 = 125490
Step 142: 125490 + 890 = 126380
Step 143: 126380 + 890 = 127270
Step 144: 127270 + 890 = 128160
Step 145: 128160 + 890 = 129050
Step 146: 129050 + 890 = 129940
Step 147: 129940 + 890 = 130830
Step 148: 130830 + 890 = 131720
Step 149: 131720 + 890 = 132610
Step 150: 132610 + 890 = 133500
Step 151: 133500 + 890 = 134390
Step 152: 134390 + 890 = 135280
Step 153: 135280 + 890 = 136170
Step 154: 136170 + 890 = 137060
Step 155: 137060 + 890 = 137950
Step 156: 137950 + 890 = 138840
Step 157: 138840 + 890 = 139730
Step 158: 139730 + 890 = 140620
Step 159: 140620 + 890 = 141510
Step 160: 141510 + 890 = 142400
Step 161: 142400 + 890 = 143290
Step 162: 143290 + 890 = 144180
Step 163: 144180 + 890 = 145070
Step 164: 145070 + 890 = 145960
Step 165: 145960 + 890 = 146850
Step 166: 146850 + 890 = 147740
Step 167: 147740 + 890 = 148630
Step 168: 148630 + 890 = 149520
Step 169: 149520 + 890 = 150410
Step 170: 150410 + 890 = 151300
Step 171: 151300 + 890 = 152190
Step 172: 152190 + 890 = 153080
Step 173: 153080 + 890 = 153970
Step 174: 153970 + 890 = 154860
Step 175: 154860 + 890 = 155750
Step 176: 155750 + 890 = 156640
Step 177: 156640 + 890 = 157530
Step 178: 157530 + 890 = 158420
Step 179: 158420 + 890 = 159310
Step 180: 159310 + 890 = 160200
Step 181: 160200 + 890 = 161090
Step 182: 161090 + 890 = 161980
Step 183: 161980 + 890 = 162870
Step 184: 162870 + 890 = 163760
Step 185: 163760 + 890 = 164650
Step 186: 164650 + 890 = 165540
Step 187: 165540 + 890 = 166430
Step 188: 166430 + 890 = 167320
Step 189: 167320 + 890 = 168210
Step 190: 168210 + 890 = 169100
Step 191: 169100 + 890 = 169990
Step 192: 169990 + 890 = 170880
Step 193: 170880 + 890 = 171770
Step 194: 171770 + 890 = 172660
Step 195: 172660 + 890 = 173550
Step 196: 173550 + 890 = 174440
Step 197: 174440 + 890 = 175330
Step 198: 175330 + 890 = 176220
Step 199: 176220 + 890 = 177110
Step 200: 177110 + 890 = 178000
Step 201: 178000 + 890 = 178890
Step 202: 178890 + 890 = 179780
Step 203: 179780 + 890 = 180670
Step 204: 180670 + 890 = 181560
Step 205: 181560 + 890 = 182450
Step 206: 182450 + 890 = 183340
Step 207: 183340 + 890 = 184230
Step 208: 184230 + 890 = 185120
Step 209: 185120 + 890 = 186010
Step 210: 186010 + 890 = 186900
Step 211: 186900 + 890 = 187790
Step 212: 187790 + 890 = 188680
Step 213: 188680 + 890 = 189570
Step 214: 189570 + 890 = 190460
Step 215: 190460 + 890 = 191350
Step 216: 191350 + 890 = 192240
Step 217: 192240 + 890 = 193130
Step 218: 193130 + 890 = 194020
Step 219: 194020 + 890 = 194910
Step 220: 194910 + 890 = 195800
Step 221: 195800 + 890 = 196690
Step 222: 196690 + 890 = 197580
Step 223: 197580 + 890 = 198470
Step 224: 198470 + 890 = 199360
Step 225: 199360 + 890 = 200250
Step 226: 200250 + 890 = 201140
Step 227: 201140 + 890 = 202030
Step 228: 202030 + 890 = 202920
Step 229: 202920 + 890 = 203810
Step 230: 203810 + 890 = 204700
Step 231: 204700 + 890 = 205590
Step 232: 205590 + 890 = 206480
Step 233: 206480 + 890 = 207370
Step 234: 207370 + 890 = 208260
Step 235: 208260 + 890 = 209150
Step 236: 209150 + 890 = 210040
Step 237: 210040 + 890 = 210930
Step 238: 210930 + 890 = 211820
Step 239: 211820 + 890 = 212710
Step 240: 212710 + 890 = 213600
Step 241: 213600 + 890 = 214490
Step 242: 214490 + 890 = 215380
Step 243: 215380 + 890 = 216270
Step 244: 216270 + 890 = 217160
Step 245: 217160 + 890 = 218050
Step 246: 218050 + 890 = 218940
Step 247: 218940 + 890 = 219830
Step 248: 219830 + 890 = 220720
Step 249: 220720 + 890 = 221610
Step 250: 221610 + 890 = 222500
Step 251: 222500 + 890 = 223390
Step 252: 223390 + 890 = 224280
Step 253: 224280 + 890 = 225170
Step 254: 225170 + 890 = 226060
Step 255: 226060 + 890 = 226950
Step 256: 226950 + 890 = 227840
Step 257: 227840 + 890 = 228730
Step 258: 228730 + 890 = 229620
Step 259: 229620 + 890 = 230510
Step 260: 230510 + 890 = 231400
Step 261: 231400 + 890 = 232290
Step 262: 232290 + 890 = 233180
Step 263: 233180 + 890 = 234070
Step 264: 234070 + 890 = 234960
Step 265: 234960 + 890 = 235850
Step 266: 235850 + 890 = 236740
Step 267: 236740 + 890 = 237630
Step 268: 237630 + 890 = 238520
Step 269: 238520 + 890 = 239410
Step 270: 239410 + 890 = 240300
Step 271: 240300 + 890 = 241190
Step 272: 241190 + 890 = 242080
Step 273: 242080 + 890 = 242970
Step 274: 242970 + 890 = 243860
Step 275: 243860 + 890 = 244750
Step 276: 244750 + 890 = 245640
Step 277: 245640 + 890 = 246530
Step 278: 246530 + 890 = 247420
Step 279: 247420 + 890 = 248310
Step 280: 248310 + 890 = 249200
Step 281: 249200 + 890 = 250090
Step 282: 250090 + 890 = 250980
Step 283: 250980 + 890 = 251870
Step 284: 251870 + 890 = 252760
Step 285: 252760 + 890 = 253650
Step 286: 253650 + 890 = 254540
Step 287: 254540 + 890 = 255430
Step 288: 255430 + 890 = 256320
Step 289: 256320 + 890 = 257210
Step 290: 257210 + 890 = 258100
Step 291: 258100 + 890 = 258990
Step 292: 258990 + 890 = 259880
Step 293: 259880 + 890 = 260770
Step 294: 260770 + 890 = 261660
Step 295: 261660 + 890 = 262550
Step 296: 262550 + 890 = 263440
Step 297: 263440 + 890 = 264330
Step 298: 264330 + 890 = 265220
Step 299: 265220 + 890 = 266110
Step 300: 266110 + 890 = 267000
Step 301: 267000 + 890 = 267890
Step 302: 267890 + 890 = 268780
Step 303: 268780 + 890 = 269670
Step 304: 269670 + 890 = 270560
Step 305: 270560 + 890 = 271450
Step 306: 271450 + 890 = 272340
Step 307: 272340 + 890 = 273230
Step 308: 273230 + 890 = 274120
Step 309: 274120 + 890 = 275010
Step 310: 275010 + 890 = 275900
Step 311: 275900 + 890 = 276790
Step 312: 276790 + 890 = 277680
Step 313: 277680 + 890 = 278570
Step 314: 278570 + 890 = 279460
Step 315: 279460 + 890 = 280350
Step 316: 280350 + 890 = 281240
Step 317: 281240 + 890 = 282130
Step 318: 282130 + 890 = 283020
Step 319: 283020 + 890 = 283910
Step 320: 283910 + 890 = 284800
Step 321: 284800 + 890 = 285690

So, 890*321 = 285690