Let's get this math done. We have 395 and we're going to multiply it by 405. This is the same as taking 395 and adding it to itself 405 times.
Step 1: 0 + 395 = 395
Step 2: 395 + 395 = 790
Step 3: 790 + 395 = 1185
Step 4: 1185 + 395 = 1580
Step 5: 1580 + 395 = 1975
Step 6: 1975 + 395 = 2370
Step 7: 2370 + 395 = 2765
Step 8: 2765 + 395 = 3160
Step 9: 3160 + 395 = 3555
Step 10: 3555 + 395 = 3950
Step 11: 3950 + 395 = 4345
Step 12: 4345 + 395 = 4740
Step 13: 4740 + 395 = 5135
Step 14: 5135 + 395 = 5530
Step 15: 5530 + 395 = 5925
Step 16: 5925 + 395 = 6320
Step 17: 6320 + 395 = 6715
Step 18: 6715 + 395 = 7110
Step 19: 7110 + 395 = 7505
Step 20: 7505 + 395 = 7900
Step 21: 7900 + 395 = 8295
Step 22: 8295 + 395 = 8690
Step 23: 8690 + 395 = 9085
Step 24: 9085 + 395 = 9480
Step 25: 9480 + 395 = 9875
Step 26: 9875 + 395 = 10270
Step 27: 10270 + 395 = 10665
Step 28: 10665 + 395 = 11060
Step 29: 11060 + 395 = 11455
Step 30: 11455 + 395 = 11850
Step 31: 11850 + 395 = 12245
Step 32: 12245 + 395 = 12640
Step 33: 12640 + 395 = 13035
Step 34: 13035 + 395 = 13430
Step 35: 13430 + 395 = 13825
Step 36: 13825 + 395 = 14220
Step 37: 14220 + 395 = 14615
Step 38: 14615 + 395 = 15010
Step 39: 15010 + 395 = 15405
Step 40: 15405 + 395 = 15800
Step 41: 15800 + 395 = 16195
Step 42: 16195 + 395 = 16590
Step 43: 16590 + 395 = 16985
Step 44: 16985 + 395 = 17380
Step 45: 17380 + 395 = 17775
Step 46: 17775 + 395 = 18170
Step 47: 18170 + 395 = 18565
Step 48: 18565 + 395 = 18960
Step 49: 18960 + 395 = 19355
Step 50: 19355 + 395 = 19750
Step 51: 19750 + 395 = 20145
Step 52: 20145 + 395 = 20540
Step 53: 20540 + 395 = 20935
Step 54: 20935 + 395 = 21330
Step 55: 21330 + 395 = 21725
Step 56: 21725 + 395 = 22120
Step 57: 22120 + 395 = 22515
Step 58: 22515 + 395 = 22910
Step 59: 22910 + 395 = 23305
Step 60: 23305 + 395 = 23700
Step 61: 23700 + 395 = 24095
Step 62: 24095 + 395 = 24490
Step 63: 24490 + 395 = 24885
Step 64: 24885 + 395 = 25280
Step 65: 25280 + 395 = 25675
Step 66: 25675 + 395 = 26070
Step 67: 26070 + 395 = 26465
Step 68: 26465 + 395 = 26860
Step 69: 26860 + 395 = 27255
Step 70: 27255 + 395 = 27650
Step 71: 27650 + 395 = 28045
Step 72: 28045 + 395 = 28440
Step 73: 28440 + 395 = 28835
Step 74: 28835 + 395 = 29230
Step 75: 29230 + 395 = 29625
Step 76: 29625 + 395 = 30020
Step 77: 30020 + 395 = 30415
Step 78: 30415 + 395 = 30810
Step 79: 30810 + 395 = 31205
Step 80: 31205 + 395 = 31600
Step 81: 31600 + 395 = 31995
Step 82: 31995 + 395 = 32390
Step 83: 32390 + 395 = 32785
Step 84: 32785 + 395 = 33180
Step 85: 33180 + 395 = 33575
Step 86: 33575 + 395 = 33970
Step 87: 33970 + 395 = 34365
Step 88: 34365 + 395 = 34760
Step 89: 34760 + 395 = 35155
Step 90: 35155 + 395 = 35550
Step 91: 35550 + 395 = 35945
Step 92: 35945 + 395 = 36340
Step 93: 36340 + 395 = 36735
Step 94: 36735 + 395 = 37130
Step 95: 37130 + 395 = 37525
Step 96: 37525 + 395 = 37920
Step 97: 37920 + 395 = 38315
Step 98: 38315 + 395 = 38710
Step 99: 38710 + 395 = 39105
Step 100: 39105 + 395 = 39500
Step 101: 39500 + 395 = 39895
Step 102: 39895 + 395 = 40290
Step 103: 40290 + 395 = 40685
Step 104: 40685 + 395 = 41080
Step 105: 41080 + 395 = 41475
Step 106: 41475 + 395 = 41870
Step 107: 41870 + 395 = 42265
Step 108: 42265 + 395 = 42660
Step 109: 42660 + 395 = 43055
Step 110: 43055 + 395 = 43450
Step 111: 43450 + 395 = 43845
Step 112: 43845 + 395 = 44240
Step 113: 44240 + 395 = 44635
Step 114: 44635 + 395 = 45030
Step 115: 45030 + 395 = 45425
Step 116: 45425 + 395 = 45820
Step 117: 45820 + 395 = 46215
Step 118: 46215 + 395 = 46610
Step 119: 46610 + 395 = 47005
Step 120: 47005 + 395 = 47400
Step 121: 47400 + 395 = 47795
Step 122: 47795 + 395 = 48190
Step 123: 48190 + 395 = 48585
Step 124: 48585 + 395 = 48980
Step 125: 48980 + 395 = 49375
Step 126: 49375 + 395 = 49770
Step 127: 49770 + 395 = 50165
Step 128: 50165 + 395 = 50560
Step 129: 50560 + 395 = 50955
Step 130: 50955 + 395 = 51350
Step 131: 51350 + 395 = 51745
Step 132: 51745 + 395 = 52140
Step 133: 52140 + 395 = 52535
Step 134: 52535 + 395 = 52930
Step 135: 52930 + 395 = 53325
Step 136: 53325 + 395 = 53720
Step 137: 53720 + 395 = 54115
Step 138: 54115 + 395 = 54510
Step 139: 54510 + 395 = 54905
Step 140: 54905 + 395 = 55300
Step 141: 55300 + 395 = 55695
Step 142: 55695 + 395 = 56090
Step 143: 56090 + 395 = 56485
Step 144: 56485 + 395 = 56880
Step 145: 56880 + 395 = 57275
Step 146: 57275 + 395 = 57670
Step 147: 57670 + 395 = 58065
Step 148: 58065 + 395 = 58460
Step 149: 58460 + 395 = 58855
Step 150: 58855 + 395 = 59250
Step 151: 59250 + 395 = 59645
Step 152: 59645 + 395 = 60040
Step 153: 60040 + 395 = 60435
Step 154: 60435 + 395 = 60830
Step 155: 60830 + 395 = 61225
Step 156: 61225 + 395 = 61620
Step 157: 61620 + 395 = 62015
Step 158: 62015 + 395 = 62410
Step 159: 62410 + 395 = 62805
Step 160: 62805 + 395 = 63200
Step 161: 63200 + 395 = 63595
Step 162: 63595 + 395 = 63990
Step 163: 63990 + 395 = 64385
Step 164: 64385 + 395 = 64780
Step 165: 64780 + 395 = 65175
Step 166: 65175 + 395 = 65570
Step 167: 65570 + 395 = 65965
Step 168: 65965 + 395 = 66360
Step 169: 66360 + 395 = 66755
Step 170: 66755 + 395 = 67150
Step 171: 67150 + 395 = 67545
Step 172: 67545 + 395 = 67940
Step 173: 67940 + 395 = 68335
Step 174: 68335 + 395 = 68730
Step 175: 68730 + 395 = 69125
Step 176: 69125 + 395 = 69520
Step 177: 69520 + 395 = 69915
Step 178: 69915 + 395 = 70310
Step 179: 70310 + 395 = 70705
Step 180: 70705 + 395 = 71100
Step 181: 71100 + 395 = 71495
Step 182: 71495 + 395 = 71890
Step 183: 71890 + 395 = 72285
Step 184: 72285 + 395 = 72680
Step 185: 72680 + 395 = 73075
Step 186: 73075 + 395 = 73470
Step 187: 73470 + 395 = 73865
Step 188: 73865 + 395 = 74260
Step 189: 74260 + 395 = 74655
Step 190: 74655 + 395 = 75050
Step 191: 75050 + 395 = 75445
Step 192: 75445 + 395 = 75840
Step 193: 75840 + 395 = 76235
Step 194: 76235 + 395 = 76630
Step 195: 76630 + 395 = 77025
Step 196: 77025 + 395 = 77420
Step 197: 77420 + 395 = 77815
Step 198: 77815 + 395 = 78210
Step 199: 78210 + 395 = 78605
Step 200: 78605 + 395 = 79000
Step 201: 79000 + 395 = 79395
Step 202: 79395 + 395 = 79790
Step 203: 79790 + 395 = 80185
Step 204: 80185 + 395 = 80580
Step 205: 80580 + 395 = 80975
Step 206: 80975 + 395 = 81370
Step 207: 81370 + 395 = 81765
Step 208: 81765 + 395 = 82160
Step 209: 82160 + 395 = 82555
Step 210: 82555 + 395 = 82950
Step 211: 82950 + 395 = 83345
Step 212: 83345 + 395 = 83740
Step 213: 83740 + 395 = 84135
Step 214: 84135 + 395 = 84530
Step 215: 84530 + 395 = 84925
Step 216: 84925 + 395 = 85320
Step 217: 85320 + 395 = 85715
Step 218: 85715 + 395 = 86110
Step 219: 86110 + 395 = 86505
Step 220: 86505 + 395 = 86900
Step 221: 86900 + 395 = 87295
Step 222: 87295 + 395 = 87690
Step 223: 87690 + 395 = 88085
Step 224: 88085 + 395 = 88480
Step 225: 88480 + 395 = 88875
Step 226: 88875 + 395 = 89270
Step 227: 89270 + 395 = 89665
Step 228: 89665 + 395 = 90060
Step 229: 90060 + 395 = 90455
Step 230: 90455 + 395 = 90850
Step 231: 90850 + 395 = 91245
Step 232: 91245 + 395 = 91640
Step 233: 91640 + 395 = 92035
Step 234: 92035 + 395 = 92430
Step 235: 92430 + 395 = 92825
Step 236: 92825 + 395 = 93220
Step 237: 93220 + 395 = 93615
Step 238: 93615 + 395 = 94010
Step 239: 94010 + 395 = 94405
Step 240: 94405 + 395 = 94800
Step 241: 94800 + 395 = 95195
Step 242: 95195 + 395 = 95590
Step 243: 95590 + 395 = 95985
Step 244: 95985 + 395 = 96380
Step 245: 96380 + 395 = 96775
Step 246: 96775 + 395 = 97170
Step 247: 97170 + 395 = 97565
Step 248: 97565 + 395 = 97960
Step 249: 97960 + 395 = 98355
Step 250: 98355 + 395 = 98750
Step 251: 98750 + 395 = 99145
Step 252: 99145 + 395 = 99540
Step 253: 99540 + 395 = 99935
Step 254: 99935 + 395 = 100330
Step 255: 100330 + 395 = 100725
Step 256: 100725 + 395 = 101120
Step 257: 101120 + 395 = 101515
Step 258: 101515 + 395 = 101910
Step 259: 101910 + 395 = 102305
Step 260: 102305 + 395 = 102700
Step 261: 102700 + 395 = 103095
Step 262: 103095 + 395 = 103490
Step 263: 103490 + 395 = 103885
Step 264: 103885 + 395 = 104280
Step 265: 104280 + 395 = 104675
Step 266: 104675 + 395 = 105070
Step 267: 105070 + 395 = 105465
Step 268: 105465 + 395 = 105860
Step 269: 105860 + 395 = 106255
Step 270: 106255 + 395 = 106650
Step 271: 106650 + 395 = 107045
Step 272: 107045 + 395 = 107440
Step 273: 107440 + 395 = 107835
Step 274: 107835 + 395 = 108230
Step 275: 108230 + 395 = 108625
Step 276: 108625 + 395 = 109020
Step 277: 109020 + 395 = 109415
Step 278: 109415 + 395 = 109810
Step 279: 109810 + 395 = 110205
Step 280: 110205 + 395 = 110600
Step 281: 110600 + 395 = 110995
Step 282: 110995 + 395 = 111390
Step 283: 111390 + 395 = 111785
Step 284: 111785 + 395 = 112180
Step 285: 112180 + 395 = 112575
Step 286: 112575 + 395 = 112970
Step 287: 112970 + 395 = 113365
Step 288: 113365 + 395 = 113760
Step 289: 113760 + 395 = 114155
Step 290: 114155 + 395 = 114550
Step 291: 114550 + 395 = 114945
Step 292: 114945 + 395 = 115340
Step 293: 115340 + 395 = 115735
Step 294: 115735 + 395 = 116130
Step 295: 116130 + 395 = 116525
Step 296: 116525 + 395 = 116920
Step 297: 116920 + 395 = 117315
Step 298: 117315 + 395 = 117710
Step 299: 117710 + 395 = 118105
Step 300: 118105 + 395 = 118500
Step 301: 118500 + 395 = 118895
Step 302: 118895 + 395 = 119290
Step 303: 119290 + 395 = 119685
Step 304: 119685 + 395 = 120080
Step 305: 120080 + 395 = 120475
Step 306: 120475 + 395 = 120870
Step 307: 120870 + 395 = 121265
Step 308: 121265 + 395 = 121660
Step 309: 121660 + 395 = 122055
Step 310: 122055 + 395 = 122450
Step 311: 122450 + 395 = 122845
Step 312: 122845 + 395 = 123240
Step 313: 123240 + 395 = 123635
Step 314: 123635 + 395 = 124030
Step 315: 124030 + 395 = 124425
Step 316: 124425 + 395 = 124820
Step 317: 124820 + 395 = 125215
Step 318: 125215 + 395 = 125610
Step 319: 125610 + 395 = 126005
Step 320: 126005 + 395 = 126400
Step 321: 126400 + 395 = 126795
Step 322: 126795 + 395 = 127190
Step 323: 127190 + 395 = 127585
Step 324: 127585 + 395 = 127980
Step 325: 127980 + 395 = 128375
Step 326: 128375 + 395 = 128770
Step 327: 128770 + 395 = 129165
Step 328: 129165 + 395 = 129560
Step 329: 129560 + 395 = 129955
Step 330: 129955 + 395 = 130350
Step 331: 130350 + 395 = 130745
Step 332: 130745 + 395 = 131140
Step 333: 131140 + 395 = 131535
Step 334: 131535 + 395 = 131930
Step 335: 131930 + 395 = 132325
Step 336: 132325 + 395 = 132720
Step 337: 132720 + 395 = 133115
Step 338: 133115 + 395 = 133510
Step 339: 133510 + 395 = 133905
Step 340: 133905 + 395 = 134300
Step 341: 134300 + 395 = 134695
Step 342: 134695 + 395 = 135090
Step 343: 135090 + 395 = 135485
Step 344: 135485 + 395 = 135880
Step 345: 135880 + 395 = 136275
Step 346: 136275 + 395 = 136670
Step 347: 136670 + 395 = 137065
Step 348: 137065 + 395 = 137460
Step 349: 137460 + 395 = 137855
Step 350: 137855 + 395 = 138250
Step 351: 138250 + 395 = 138645
Step 352: 138645 + 395 = 139040
Step 353: 139040 + 395 = 139435
Step 354: 139435 + 395 = 139830
Step 355: 139830 + 395 = 140225
Step 356: 140225 + 395 = 140620
Step 357: 140620 + 395 = 141015
Step 358: 141015 + 395 = 141410
Step 359: 141410 + 395 = 141805
Step 360: 141805 + 395 = 142200
Step 361: 142200 + 395 = 142595
Step 362: 142595 + 395 = 142990
Step 363: 142990 + 395 = 143385
Step 364: 143385 + 395 = 143780
Step 365: 143780 + 395 = 144175
Step 366: 144175 + 395 = 144570
Step 367: 144570 + 395 = 144965
Step 368: 144965 + 395 = 145360
Step 369: 145360 + 395 = 145755
Step 370: 145755 + 395 = 146150
Step 371: 146150 + 395 = 146545
Step 372: 146545 + 395 = 146940
Step 373: 146940 + 395 = 147335
Step 374: 147335 + 395 = 147730
Step 375: 147730 + 395 = 148125
Step 376: 148125 + 395 = 148520
Step 377: 148520 + 395 = 148915
Step 378: 148915 + 395 = 149310
Step 379: 149310 + 395 = 149705
Step 380: 149705 + 395 = 150100
Step 381: 150100 + 395 = 150495
Step 382: 150495 + 395 = 150890
Step 383: 150890 + 395 = 151285
Step 384: 151285 + 395 = 151680
Step 385: 151680 + 395 = 152075
Step 386: 152075 + 395 = 152470
Step 387: 152470 + 395 = 152865
Step 388: 152865 + 395 = 153260
Step 389: 153260 + 395 = 153655
Step 390: 153655 + 395 = 154050
Step 391: 154050 + 395 = 154445
Step 392: 154445 + 395 = 154840
Step 393: 154840 + 395 = 155235
Step 394: 155235 + 395 = 155630
Step 395: 155630 + 395 = 156025
Step 396: 156025 + 395 = 156420
Step 397: 156420 + 395 = 156815
Step 398: 156815 + 395 = 157210
Step 399: 157210 + 395 = 157605
Step 400: 157605 + 395 = 158000
Step 401: 158000 + 395 = 158395
Step 402: 158395 + 395 = 158790
Step 403: 158790 + 395 = 159185
Step 404: 159185 + 395 = 159580
Step 405: 159580 + 395 = 159975

So, 395*405 = 159975