Let's roll up our sleeves and solve this. We have 841 and we're going to multiply it by 320, essentially adding 841 to itself 320 times.
Step 1: 0 + 841 = 841
Step 2: 841 + 841 = 1682
Step 3: 1682 + 841 = 2523
Step 4: 2523 + 841 = 3364
Step 5: 3364 + 841 = 4205
Step 6: 4205 + 841 = 5046
Step 7: 5046 + 841 = 5887
Step 8: 5887 + 841 = 6728
Step 9: 6728 + 841 = 7569
Step 10: 7569 + 841 = 8410
Step 11: 8410 + 841 = 9251
Step 12: 9251 + 841 = 10092
Step 13: 10092 + 841 = 10933
Step 14: 10933 + 841 = 11774
Step 15: 11774 + 841 = 12615
Step 16: 12615 + 841 = 13456
Step 17: 13456 + 841 = 14297
Step 18: 14297 + 841 = 15138
Step 19: 15138 + 841 = 15979
Step 20: 15979 + 841 = 16820
Step 21: 16820 + 841 = 17661
Step 22: 17661 + 841 = 18502
Step 23: 18502 + 841 = 19343
Step 24: 19343 + 841 = 20184
Step 25: 20184 + 841 = 21025
Step 26: 21025 + 841 = 21866
Step 27: 21866 + 841 = 22707
Step 28: 22707 + 841 = 23548
Step 29: 23548 + 841 = 24389
Step 30: 24389 + 841 = 25230
Step 31: 25230 + 841 = 26071
Step 32: 26071 + 841 = 26912
Step 33: 26912 + 841 = 27753
Step 34: 27753 + 841 = 28594
Step 35: 28594 + 841 = 29435
Step 36: 29435 + 841 = 30276
Step 37: 30276 + 841 = 31117
Step 38: 31117 + 841 = 31958
Step 39: 31958 + 841 = 32799
Step 40: 32799 + 841 = 33640
Step 41: 33640 + 841 = 34481
Step 42: 34481 + 841 = 35322
Step 43: 35322 + 841 = 36163
Step 44: 36163 + 841 = 37004
Step 45: 37004 + 841 = 37845
Step 46: 37845 + 841 = 38686
Step 47: 38686 + 841 = 39527
Step 48: 39527 + 841 = 40368
Step 49: 40368 + 841 = 41209
Step 50: 41209 + 841 = 42050
Step 51: 42050 + 841 = 42891
Step 52: 42891 + 841 = 43732
Step 53: 43732 + 841 = 44573
Step 54: 44573 + 841 = 45414
Step 55: 45414 + 841 = 46255
Step 56: 46255 + 841 = 47096
Step 57: 47096 + 841 = 47937
Step 58: 47937 + 841 = 48778
Step 59: 48778 + 841 = 49619
Step 60: 49619 + 841 = 50460
Step 61: 50460 + 841 = 51301
Step 62: 51301 + 841 = 52142
Step 63: 52142 + 841 = 52983
Step 64: 52983 + 841 = 53824
Step 65: 53824 + 841 = 54665
Step 66: 54665 + 841 = 55506
Step 67: 55506 + 841 = 56347
Step 68: 56347 + 841 = 57188
Step 69: 57188 + 841 = 58029
Step 70: 58029 + 841 = 58870
Step 71: 58870 + 841 = 59711
Step 72: 59711 + 841 = 60552
Step 73: 60552 + 841 = 61393
Step 74: 61393 + 841 = 62234
Step 75: 62234 + 841 = 63075
Step 76: 63075 + 841 = 63916
Step 77: 63916 + 841 = 64757
Step 78: 64757 + 841 = 65598
Step 79: 65598 + 841 = 66439
Step 80: 66439 + 841 = 67280
Step 81: 67280 + 841 = 68121
Step 82: 68121 + 841 = 68962
Step 83: 68962 + 841 = 69803
Step 84: 69803 + 841 = 70644
Step 85: 70644 + 841 = 71485
Step 86: 71485 + 841 = 72326
Step 87: 72326 + 841 = 73167
Step 88: 73167 + 841 = 74008
Step 89: 74008 + 841 = 74849
Step 90: 74849 + 841 = 75690
Step 91: 75690 + 841 = 76531
Step 92: 76531 + 841 = 77372
Step 93: 77372 + 841 = 78213
Step 94: 78213 + 841 = 79054
Step 95: 79054 + 841 = 79895
Step 96: 79895 + 841 = 80736
Step 97: 80736 + 841 = 81577
Step 98: 81577 + 841 = 82418
Step 99: 82418 + 841 = 83259
Step 100: 83259 + 841 = 84100
Step 101: 84100 + 841 = 84941
Step 102: 84941 + 841 = 85782
Step 103: 85782 + 841 = 86623
Step 104: 86623 + 841 = 87464
Step 105: 87464 + 841 = 88305
Step 106: 88305 + 841 = 89146
Step 107: 89146 + 841 = 89987
Step 108: 89987 + 841 = 90828
Step 109: 90828 + 841 = 91669
Step 110: 91669 + 841 = 92510
Step 111: 92510 + 841 = 93351
Step 112: 93351 + 841 = 94192
Step 113: 94192 + 841 = 95033
Step 114: 95033 + 841 = 95874
Step 115: 95874 + 841 = 96715
Step 116: 96715 + 841 = 97556
Step 117: 97556 + 841 = 98397
Step 118: 98397 + 841 = 99238
Step 119: 99238 + 841 = 100079
Step 120: 100079 + 841 = 100920
Step 121: 100920 + 841 = 101761
Step 122: 101761 + 841 = 102602
Step 123: 102602 + 841 = 103443
Step 124: 103443 + 841 = 104284
Step 125: 104284 + 841 = 105125
Step 126: 105125 + 841 = 105966
Step 127: 105966 + 841 = 106807
Step 128: 106807 + 841 = 107648
Step 129: 107648 + 841 = 108489
Step 130: 108489 + 841 = 109330
Step 131: 109330 + 841 = 110171
Step 132: 110171 + 841 = 111012
Step 133: 111012 + 841 = 111853
Step 134: 111853 + 841 = 112694
Step 135: 112694 + 841 = 113535
Step 136: 113535 + 841 = 114376
Step 137: 114376 + 841 = 115217
Step 138: 115217 + 841 = 116058
Step 139: 116058 + 841 = 116899
Step 140: 116899 + 841 = 117740
Step 141: 117740 + 841 = 118581
Step 142: 118581 + 841 = 119422
Step 143: 119422 + 841 = 120263
Step 144: 120263 + 841 = 121104
Step 145: 121104 + 841 = 121945
Step 146: 121945 + 841 = 122786
Step 147: 122786 + 841 = 123627
Step 148: 123627 + 841 = 124468
Step 149: 124468 + 841 = 125309
Step 150: 125309 + 841 = 126150
Step 151: 126150 + 841 = 126991
Step 152: 126991 + 841 = 127832
Step 153: 127832 + 841 = 128673
Step 154: 128673 + 841 = 129514
Step 155: 129514 + 841 = 130355
Step 156: 130355 + 841 = 131196
Step 157: 131196 + 841 = 132037
Step 158: 132037 + 841 = 132878
Step 159: 132878 + 841 = 133719
Step 160: 133719 + 841 = 134560
Step 161: 134560 + 841 = 135401
Step 162: 135401 + 841 = 136242
Step 163: 136242 + 841 = 137083
Step 164: 137083 + 841 = 137924
Step 165: 137924 + 841 = 138765
Step 166: 138765 + 841 = 139606
Step 167: 139606 + 841 = 140447
Step 168: 140447 + 841 = 141288
Step 169: 141288 + 841 = 142129
Step 170: 142129 + 841 = 142970
Step 171: 142970 + 841 = 143811
Step 172: 143811 + 841 = 144652
Step 173: 144652 + 841 = 145493
Step 174: 145493 + 841 = 146334
Step 175: 146334 + 841 = 147175
Step 176: 147175 + 841 = 148016
Step 177: 148016 + 841 = 148857
Step 178: 148857 + 841 = 149698
Step 179: 149698 + 841 = 150539
Step 180: 150539 + 841 = 151380
Step 181: 151380 + 841 = 152221
Step 182: 152221 + 841 = 153062
Step 183: 153062 + 841 = 153903
Step 184: 153903 + 841 = 154744
Step 185: 154744 + 841 = 155585
Step 186: 155585 + 841 = 156426
Step 187: 156426 + 841 = 157267
Step 188: 157267 + 841 = 158108
Step 189: 158108 + 841 = 158949
Step 190: 158949 + 841 = 159790
Step 191: 159790 + 841 = 160631
Step 192: 160631 + 841 = 161472
Step 193: 161472 + 841 = 162313
Step 194: 162313 + 841 = 163154
Step 195: 163154 + 841 = 163995
Step 196: 163995 + 841 = 164836
Step 197: 164836 + 841 = 165677
Step 198: 165677 + 841 = 166518
Step 199: 166518 + 841 = 167359
Step 200: 167359 + 841 = 168200
Step 201: 168200 + 841 = 169041
Step 202: 169041 + 841 = 169882
Step 203: 169882 + 841 = 170723
Step 204: 170723 + 841 = 171564
Step 205: 171564 + 841 = 172405
Step 206: 172405 + 841 = 173246
Step 207: 173246 + 841 = 174087
Step 208: 174087 + 841 = 174928
Step 209: 174928 + 841 = 175769
Step 210: 175769 + 841 = 176610
Step 211: 176610 + 841 = 177451
Step 212: 177451 + 841 = 178292
Step 213: 178292 + 841 = 179133
Step 214: 179133 + 841 = 179974
Step 215: 179974 + 841 = 180815
Step 216: 180815 + 841 = 181656
Step 217: 181656 + 841 = 182497
Step 218: 182497 + 841 = 183338
Step 219: 183338 + 841 = 184179
Step 220: 184179 + 841 = 185020
Step 221: 185020 + 841 = 185861
Step 222: 185861 + 841 = 186702
Step 223: 186702 + 841 = 187543
Step 224: 187543 + 841 = 188384
Step 225: 188384 + 841 = 189225
Step 226: 189225 + 841 = 190066
Step 227: 190066 + 841 = 190907
Step 228: 190907 + 841 = 191748
Step 229: 191748 + 841 = 192589
Step 230: 192589 + 841 = 193430
Step 231: 193430 + 841 = 194271
Step 232: 194271 + 841 = 195112
Step 233: 195112 + 841 = 195953
Step 234: 195953 + 841 = 196794
Step 235: 196794 + 841 = 197635
Step 236: 197635 + 841 = 198476
Step 237: 198476 + 841 = 199317
Step 238: 199317 + 841 = 200158
Step 239: 200158 + 841 = 200999
Step 240: 200999 + 841 = 201840
Step 241: 201840 + 841 = 202681
Step 242: 202681 + 841 = 203522
Step 243: 203522 + 841 = 204363
Step 244: 204363 + 841 = 205204
Step 245: 205204 + 841 = 206045
Step 246: 206045 + 841 = 206886
Step 247: 206886 + 841 = 207727
Step 248: 207727 + 841 = 208568
Step 249: 208568 + 841 = 209409
Step 250: 209409 + 841 = 210250
Step 251: 210250 + 841 = 211091
Step 252: 211091 + 841 = 211932
Step 253: 211932 + 841 = 212773
Step 254: 212773 + 841 = 213614
Step 255: 213614 + 841 = 214455
Step 256: 214455 + 841 = 215296
Step 257: 215296 + 841 = 216137
Step 258: 216137 + 841 = 216978
Step 259: 216978 + 841 = 217819
Step 260: 217819 + 841 = 218660
Step 261: 218660 + 841 = 219501
Step 262: 219501 + 841 = 220342
Step 263: 220342 + 841 = 221183
Step 264: 221183 + 841 = 222024
Step 265: 222024 + 841 = 222865
Step 266: 222865 + 841 = 223706
Step 267: 223706 + 841 = 224547
Step 268: 224547 + 841 = 225388
Step 269: 225388 + 841 = 226229
Step 270: 226229 + 841 = 227070
Step 271: 227070 + 841 = 227911
Step 272: 227911 + 841 = 228752
Step 273: 228752 + 841 = 229593
Step 274: 229593 + 841 = 230434
Step 275: 230434 + 841 = 231275
Step 276: 231275 + 841 = 232116
Step 277: 232116 + 841 = 232957
Step 278: 232957 + 841 = 233798
Step 279: 233798 + 841 = 234639
Step 280: 234639 + 841 = 235480
Step 281: 235480 + 841 = 236321
Step 282: 236321 + 841 = 237162
Step 283: 237162 + 841 = 238003
Step 284: 238003 + 841 = 238844
Step 285: 238844 + 841 = 239685
Step 286: 239685 + 841 = 240526
Step 287: 240526 + 841 = 241367
Step 288: 241367 + 841 = 242208
Step 289: 242208 + 841 = 243049
Step 290: 243049 + 841 = 243890
Step 291: 243890 + 841 = 244731
Step 292: 244731 + 841 = 245572
Step 293: 245572 + 841 = 246413
Step 294: 246413 + 841 = 247254
Step 295: 247254 + 841 = 248095
Step 296: 248095 + 841 = 248936
Step 297: 248936 + 841 = 249777
Step 298: 249777 + 841 = 250618
Step 299: 250618 + 841 = 251459
Step 300: 251459 + 841 = 252300
Step 301: 252300 + 841 = 253141
Step 302: 253141 + 841 = 253982
Step 303: 253982 + 841 = 254823
Step 304: 254823 + 841 = 255664
Step 305: 255664 + 841 = 256505
Step 306: 256505 + 841 = 257346
Step 307: 257346 + 841 = 258187
Step 308: 258187 + 841 = 259028
Step 309: 259028 + 841 = 259869
Step 310: 259869 + 841 = 260710
Step 311: 260710 + 841 = 261551
Step 312: 261551 + 841 = 262392
Step 313: 262392 + 841 = 263233
Step 314: 263233 + 841 = 264074
Step 315: 264074 + 841 = 264915
Step 316: 264915 + 841 = 265756
Step 317: 265756 + 841 = 266597
Step 318: 266597 + 841 = 267438
Step 319: 267438 + 841 = 268279
Step 320: 268279 + 841 = 269120

So, 841*320 = 269120