Let's roll up our sleeves and solve this. We have 101 and we're going to multiply it by 205, essentially adding 101 to itself 205 times.
Step 1: 0 + 101 = 101
Step 2: 101 + 101 = 202
Step 3: 202 + 101 = 303
Step 4: 303 + 101 = 404
Step 5: 404 + 101 = 505
Step 6: 505 + 101 = 606
Step 7: 606 + 101 = 707
Step 8: 707 + 101 = 808
Step 9: 808 + 101 = 909
Step 10: 909 + 101 = 1010
Step 11: 1010 + 101 = 1111
Step 12: 1111 + 101 = 1212
Step 13: 1212 + 101 = 1313
Step 14: 1313 + 101 = 1414
Step 15: 1414 + 101 = 1515
Step 16: 1515 + 101 = 1616
Step 17: 1616 + 101 = 1717
Step 18: 1717 + 101 = 1818
Step 19: 1818 + 101 = 1919
Step 20: 1919 + 101 = 2020
Step 21: 2020 + 101 = 2121
Step 22: 2121 + 101 = 2222
Step 23: 2222 + 101 = 2323
Step 24: 2323 + 101 = 2424
Step 25: 2424 + 101 = 2525
Step 26: 2525 + 101 = 2626
Step 27: 2626 + 101 = 2727
Step 28: 2727 + 101 = 2828
Step 29: 2828 + 101 = 2929
Step 30: 2929 + 101 = 3030
Step 31: 3030 + 101 = 3131
Step 32: 3131 + 101 = 3232
Step 33: 3232 + 101 = 3333
Step 34: 3333 + 101 = 3434
Step 35: 3434 + 101 = 3535
Step 36: 3535 + 101 = 3636
Step 37: 3636 + 101 = 3737
Step 38: 3737 + 101 = 3838
Step 39: 3838 + 101 = 3939
Step 40: 3939 + 101 = 4040
Step 41: 4040 + 101 = 4141
Step 42: 4141 + 101 = 4242
Step 43: 4242 + 101 = 4343
Step 44: 4343 + 101 = 4444
Step 45: 4444 + 101 = 4545
Step 46: 4545 + 101 = 4646
Step 47: 4646 + 101 = 4747
Step 48: 4747 + 101 = 4848
Step 49: 4848 + 101 = 4949
Step 50: 4949 + 101 = 5050
Step 51: 5050 + 101 = 5151
Step 52: 5151 + 101 = 5252
Step 53: 5252 + 101 = 5353
Step 54: 5353 + 101 = 5454
Step 55: 5454 + 101 = 5555
Step 56: 5555 + 101 = 5656
Step 57: 5656 + 101 = 5757
Step 58: 5757 + 101 = 5858
Step 59: 5858 + 101 = 5959
Step 60: 5959 + 101 = 6060
Step 61: 6060 + 101 = 6161
Step 62: 6161 + 101 = 6262
Step 63: 6262 + 101 = 6363
Step 64: 6363 + 101 = 6464
Step 65: 6464 + 101 = 6565
Step 66: 6565 + 101 = 6666
Step 67: 6666 + 101 = 6767
Step 68: 6767 + 101 = 6868
Step 69: 6868 + 101 = 6969
Step 70: 6969 + 101 = 7070
Step 71: 7070 + 101 = 7171
Step 72: 7171 + 101 = 7272
Step 73: 7272 + 101 = 7373
Step 74: 7373 + 101 = 7474
Step 75: 7474 + 101 = 7575
Step 76: 7575 + 101 = 7676
Step 77: 7676 + 101 = 7777
Step 78: 7777 + 101 = 7878
Step 79: 7878 + 101 = 7979
Step 80: 7979 + 101 = 8080
Step 81: 8080 + 101 = 8181
Step 82: 8181 + 101 = 8282
Step 83: 8282 + 101 = 8383
Step 84: 8383 + 101 = 8484
Step 85: 8484 + 101 = 8585
Step 86: 8585 + 101 = 8686
Step 87: 8686 + 101 = 8787
Step 88: 8787 + 101 = 8888
Step 89: 8888 + 101 = 8989
Step 90: 8989 + 101 = 9090
Step 91: 9090 + 101 = 9191
Step 92: 9191 + 101 = 9292
Step 93: 9292 + 101 = 9393
Step 94: 9393 + 101 = 9494
Step 95: 9494 + 101 = 9595
Step 96: 9595 + 101 = 9696
Step 97: 9696 + 101 = 9797
Step 98: 9797 + 101 = 9898
Step 99: 9898 + 101 = 9999
Step 100: 9999 + 101 = 10100
Step 101: 10100 + 101 = 10201
Step 102: 10201 + 101 = 10302
Step 103: 10302 + 101 = 10403
Step 104: 10403 + 101 = 10504
Step 105: 10504 + 101 = 10605
Step 106: 10605 + 101 = 10706
Step 107: 10706 + 101 = 10807
Step 108: 10807 + 101 = 10908
Step 109: 10908 + 101 = 11009
Step 110: 11009 + 101 = 11110
Step 111: 11110 + 101 = 11211
Step 112: 11211 + 101 = 11312
Step 113: 11312 + 101 = 11413
Step 114: 11413 + 101 = 11514
Step 115: 11514 + 101 = 11615
Step 116: 11615 + 101 = 11716
Step 117: 11716 + 101 = 11817
Step 118: 11817 + 101 = 11918
Step 119: 11918 + 101 = 12019
Step 120: 12019 + 101 = 12120
Step 121: 12120 + 101 = 12221
Step 122: 12221 + 101 = 12322
Step 123: 12322 + 101 = 12423
Step 124: 12423 + 101 = 12524
Step 125: 12524 + 101 = 12625
Step 126: 12625 + 101 = 12726
Step 127: 12726 + 101 = 12827
Step 128: 12827 + 101 = 12928
Step 129: 12928 + 101 = 13029
Step 130: 13029 + 101 = 13130
Step 131: 13130 + 101 = 13231
Step 132: 13231 + 101 = 13332
Step 133: 13332 + 101 = 13433
Step 134: 13433 + 101 = 13534
Step 135: 13534 + 101 = 13635
Step 136: 13635 + 101 = 13736
Step 137: 13736 + 101 = 13837
Step 138: 13837 + 101 = 13938
Step 139: 13938 + 101 = 14039
Step 140: 14039 + 101 = 14140
Step 141: 14140 + 101 = 14241
Step 142: 14241 + 101 = 14342
Step 143: 14342 + 101 = 14443
Step 144: 14443 + 101 = 14544
Step 145: 14544 + 101 = 14645
Step 146: 14645 + 101 = 14746
Step 147: 14746 + 101 = 14847
Step 148: 14847 + 101 = 14948
Step 149: 14948 + 101 = 15049
Step 150: 15049 + 101 = 15150
Step 151: 15150 + 101 = 15251
Step 152: 15251 + 101 = 15352
Step 153: 15352 + 101 = 15453
Step 154: 15453 + 101 = 15554
Step 155: 15554 + 101 = 15655
Step 156: 15655 + 101 = 15756
Step 157: 15756 + 101 = 15857
Step 158: 15857 + 101 = 15958
Step 159: 15958 + 101 = 16059
Step 160: 16059 + 101 = 16160
Step 161: 16160 + 101 = 16261
Step 162: 16261 + 101 = 16362
Step 163: 16362 + 101 = 16463
Step 164: 16463 + 101 = 16564
Step 165: 16564 + 101 = 16665
Step 166: 16665 + 101 = 16766
Step 167: 16766 + 101 = 16867
Step 168: 16867 + 101 = 16968
Step 169: 16968 + 101 = 17069
Step 170: 17069 + 101 = 17170
Step 171: 17170 + 101 = 17271
Step 172: 17271 + 101 = 17372
Step 173: 17372 + 101 = 17473
Step 174: 17473 + 101 = 17574
Step 175: 17574 + 101 = 17675
Step 176: 17675 + 101 = 17776
Step 177: 17776 + 101 = 17877
Step 178: 17877 + 101 = 17978
Step 179: 17978 + 101 = 18079
Step 180: 18079 + 101 = 18180
Step 181: 18180 + 101 = 18281
Step 182: 18281 + 101 = 18382
Step 183: 18382 + 101 = 18483
Step 184: 18483 + 101 = 18584
Step 185: 18584 + 101 = 18685
Step 186: 18685 + 101 = 18786
Step 187: 18786 + 101 = 18887
Step 188: 18887 + 101 = 18988
Step 189: 18988 + 101 = 19089
Step 190: 19089 + 101 = 19190
Step 191: 19190 + 101 = 19291
Step 192: 19291 + 101 = 19392
Step 193: 19392 + 101 = 19493
Step 194: 19493 + 101 = 19594
Step 195: 19594 + 101 = 19695
Step 196: 19695 + 101 = 19796
Step 197: 19796 + 101 = 19897
Step 198: 19897 + 101 = 19998
Step 199: 19998 + 101 = 20099
Step 200: 20099 + 101 = 20200
Step 201: 20200 + 101 = 20301
Step 202: 20301 + 101 = 20402
Step 203: 20402 + 101 = 20503
Step 204: 20503 + 101 = 20604
Step 205: 20604 + 101 = 20705

So, 101*205 = 20705