OK, let's crack this. We're given 102 and our task is to multiply it by 261. Essentially, we'll be adding 102 to itself 261 times.
Step 1: 0 + 102 = 102
Step 2: 102 + 102 = 204
Step 3: 204 + 102 = 306
Step 4: 306 + 102 = 408
Step 5: 408 + 102 = 510
Step 6: 510 + 102 = 612
Step 7: 612 + 102 = 714
Step 8: 714 + 102 = 816
Step 9: 816 + 102 = 918
Step 10: 918 + 102 = 1020
Step 11: 1020 + 102 = 1122
Step 12: 1122 + 102 = 1224
Step 13: 1224 + 102 = 1326
Step 14: 1326 + 102 = 1428
Step 15: 1428 + 102 = 1530
Step 16: 1530 + 102 = 1632
Step 17: 1632 + 102 = 1734
Step 18: 1734 + 102 = 1836
Step 19: 1836 + 102 = 1938
Step 20: 1938 + 102 = 2040
Step 21: 2040 + 102 = 2142
Step 22: 2142 + 102 = 2244
Step 23: 2244 + 102 = 2346
Step 24: 2346 + 102 = 2448
Step 25: 2448 + 102 = 2550
Step 26: 2550 + 102 = 2652
Step 27: 2652 + 102 = 2754
Step 28: 2754 + 102 = 2856
Step 29: 2856 + 102 = 2958
Step 30: 2958 + 102 = 3060
Step 31: 3060 + 102 = 3162
Step 32: 3162 + 102 = 3264
Step 33: 3264 + 102 = 3366
Step 34: 3366 + 102 = 3468
Step 35: 3468 + 102 = 3570
Step 36: 3570 + 102 = 3672
Step 37: 3672 + 102 = 3774
Step 38: 3774 + 102 = 3876
Step 39: 3876 + 102 = 3978
Step 40: 3978 + 102 = 4080
Step 41: 4080 + 102 = 4182
Step 42: 4182 + 102 = 4284
Step 43: 4284 + 102 = 4386
Step 44: 4386 + 102 = 4488
Step 45: 4488 + 102 = 4590
Step 46: 4590 + 102 = 4692
Step 47: 4692 + 102 = 4794
Step 48: 4794 + 102 = 4896
Step 49: 4896 + 102 = 4998
Step 50: 4998 + 102 = 5100
Step 51: 5100 + 102 = 5202
Step 52: 5202 + 102 = 5304
Step 53: 5304 + 102 = 5406
Step 54: 5406 + 102 = 5508
Step 55: 5508 + 102 = 5610
Step 56: 5610 + 102 = 5712
Step 57: 5712 + 102 = 5814
Step 58: 5814 + 102 = 5916
Step 59: 5916 + 102 = 6018
Step 60: 6018 + 102 = 6120
Step 61: 6120 + 102 = 6222
Step 62: 6222 + 102 = 6324
Step 63: 6324 + 102 = 6426
Step 64: 6426 + 102 = 6528
Step 65: 6528 + 102 = 6630
Step 66: 6630 + 102 = 6732
Step 67: 6732 + 102 = 6834
Step 68: 6834 + 102 = 6936
Step 69: 6936 + 102 = 7038
Step 70: 7038 + 102 = 7140
Step 71: 7140 + 102 = 7242
Step 72: 7242 + 102 = 7344
Step 73: 7344 + 102 = 7446
Step 74: 7446 + 102 = 7548
Step 75: 7548 + 102 = 7650
Step 76: 7650 + 102 = 7752
Step 77: 7752 + 102 = 7854
Step 78: 7854 + 102 = 7956
Step 79: 7956 + 102 = 8058
Step 80: 8058 + 102 = 8160
Step 81: 8160 + 102 = 8262
Step 82: 8262 + 102 = 8364
Step 83: 8364 + 102 = 8466
Step 84: 8466 + 102 = 8568
Step 85: 8568 + 102 = 8670
Step 86: 8670 + 102 = 8772
Step 87: 8772 + 102 = 8874
Step 88: 8874 + 102 = 8976
Step 89: 8976 + 102 = 9078
Step 90: 9078 + 102 = 9180
Step 91: 9180 + 102 = 9282
Step 92: 9282 + 102 = 9384
Step 93: 9384 + 102 = 9486
Step 94: 9486 + 102 = 9588
Step 95: 9588 + 102 = 9690
Step 96: 9690 + 102 = 9792
Step 97: 9792 + 102 = 9894
Step 98: 9894 + 102 = 9996
Step 99: 9996 + 102 = 10098
Step 100: 10098 + 102 = 10200
Step 101: 10200 + 102 = 10302
Step 102: 10302 + 102 = 10404
Step 103: 10404 + 102 = 10506
Step 104: 10506 + 102 = 10608
Step 105: 10608 + 102 = 10710
Step 106: 10710 + 102 = 10812
Step 107: 10812 + 102 = 10914
Step 108: 10914 + 102 = 11016
Step 109: 11016 + 102 = 11118
Step 110: 11118 + 102 = 11220
Step 111: 11220 + 102 = 11322
Step 112: 11322 + 102 = 11424
Step 113: 11424 + 102 = 11526
Step 114: 11526 + 102 = 11628
Step 115: 11628 + 102 = 11730
Step 116: 11730 + 102 = 11832
Step 117: 11832 + 102 = 11934
Step 118: 11934 + 102 = 12036
Step 119: 12036 + 102 = 12138
Step 120: 12138 + 102 = 12240
Step 121: 12240 + 102 = 12342
Step 122: 12342 + 102 = 12444
Step 123: 12444 + 102 = 12546
Step 124: 12546 + 102 = 12648
Step 125: 12648 + 102 = 12750
Step 126: 12750 + 102 = 12852
Step 127: 12852 + 102 = 12954
Step 128: 12954 + 102 = 13056
Step 129: 13056 + 102 = 13158
Step 130: 13158 + 102 = 13260
Step 131: 13260 + 102 = 13362
Step 132: 13362 + 102 = 13464
Step 133: 13464 + 102 = 13566
Step 134: 13566 + 102 = 13668
Step 135: 13668 + 102 = 13770
Step 136: 13770 + 102 = 13872
Step 137: 13872 + 102 = 13974
Step 138: 13974 + 102 = 14076
Step 139: 14076 + 102 = 14178
Step 140: 14178 + 102 = 14280
Step 141: 14280 + 102 = 14382
Step 142: 14382 + 102 = 14484
Step 143: 14484 + 102 = 14586
Step 144: 14586 + 102 = 14688
Step 145: 14688 + 102 = 14790
Step 146: 14790 + 102 = 14892
Step 147: 14892 + 102 = 14994
Step 148: 14994 + 102 = 15096
Step 149: 15096 + 102 = 15198
Step 150: 15198 + 102 = 15300
Step 151: 15300 + 102 = 15402
Step 152: 15402 + 102 = 15504
Step 153: 15504 + 102 = 15606
Step 154: 15606 + 102 = 15708
Step 155: 15708 + 102 = 15810
Step 156: 15810 + 102 = 15912
Step 157: 15912 + 102 = 16014
Step 158: 16014 + 102 = 16116
Step 159: 16116 + 102 = 16218
Step 160: 16218 + 102 = 16320
Step 161: 16320 + 102 = 16422
Step 162: 16422 + 102 = 16524
Step 163: 16524 + 102 = 16626
Step 164: 16626 + 102 = 16728
Step 165: 16728 + 102 = 16830
Step 166: 16830 + 102 = 16932
Step 167: 16932 + 102 = 17034
Step 168: 17034 + 102 = 17136
Step 169: 17136 + 102 = 17238
Step 170: 17238 + 102 = 17340
Step 171: 17340 + 102 = 17442
Step 172: 17442 + 102 = 17544
Step 173: 17544 + 102 = 17646
Step 174: 17646 + 102 = 17748
Step 175: 17748 + 102 = 17850
Step 176: 17850 + 102 = 17952
Step 177: 17952 + 102 = 18054
Step 178: 18054 + 102 = 18156
Step 179: 18156 + 102 = 18258
Step 180: 18258 + 102 = 18360
Step 181: 18360 + 102 = 18462
Step 182: 18462 + 102 = 18564
Step 183: 18564 + 102 = 18666
Step 184: 18666 + 102 = 18768
Step 185: 18768 + 102 = 18870
Step 186: 18870 + 102 = 18972
Step 187: 18972 + 102 = 19074
Step 188: 19074 + 102 = 19176
Step 189: 19176 + 102 = 19278
Step 190: 19278 + 102 = 19380
Step 191: 19380 + 102 = 19482
Step 192: 19482 + 102 = 19584
Step 193: 19584 + 102 = 19686
Step 194: 19686 + 102 = 19788
Step 195: 19788 + 102 = 19890
Step 196: 19890 + 102 = 19992
Step 197: 19992 + 102 = 20094
Step 198: 20094 + 102 = 20196
Step 199: 20196 + 102 = 20298
Step 200: 20298 + 102 = 20400
Step 201: 20400 + 102 = 20502
Step 202: 20502 + 102 = 20604
Step 203: 20604 + 102 = 20706
Step 204: 20706 + 102 = 20808
Step 205: 20808 + 102 = 20910
Step 206: 20910 + 102 = 21012
Step 207: 21012 + 102 = 21114
Step 208: 21114 + 102 = 21216
Step 209: 21216 + 102 = 21318
Step 210: 21318 + 102 = 21420
Step 211: 21420 + 102 = 21522
Step 212: 21522 + 102 = 21624
Step 213: 21624 + 102 = 21726
Step 214: 21726 + 102 = 21828
Step 215: 21828 + 102 = 21930
Step 216: 21930 + 102 = 22032
Step 217: 22032 + 102 = 22134
Step 218: 22134 + 102 = 22236
Step 219: 22236 + 102 = 22338
Step 220: 22338 + 102 = 22440
Step 221: 22440 + 102 = 22542
Step 222: 22542 + 102 = 22644
Step 223: 22644 + 102 = 22746
Step 224: 22746 + 102 = 22848
Step 225: 22848 + 102 = 22950
Step 226: 22950 + 102 = 23052
Step 227: 23052 + 102 = 23154
Step 228: 23154 + 102 = 23256
Step 229: 23256 + 102 = 23358
Step 230: 23358 + 102 = 23460
Step 231: 23460 + 102 = 23562
Step 232: 23562 + 102 = 23664
Step 233: 23664 + 102 = 23766
Step 234: 23766 + 102 = 23868
Step 235: 23868 + 102 = 23970
Step 236: 23970 + 102 = 24072
Step 237: 24072 + 102 = 24174
Step 238: 24174 + 102 = 24276
Step 239: 24276 + 102 = 24378
Step 240: 24378 + 102 = 24480
Step 241: 24480 + 102 = 24582
Step 242: 24582 + 102 = 24684
Step 243: 24684 + 102 = 24786
Step 244: 24786 + 102 = 24888
Step 245: 24888 + 102 = 24990
Step 246: 24990 + 102 = 25092
Step 247: 25092 + 102 = 25194
Step 248: 25194 + 102 = 25296
Step 249: 25296 + 102 = 25398
Step 250: 25398 + 102 = 25500
Step 251: 25500 + 102 = 25602
Step 252: 25602 + 102 = 25704
Step 253: 25704 + 102 = 25806
Step 254: 25806 + 102 = 25908
Step 255: 25908 + 102 = 26010
Step 256: 26010 + 102 = 26112
Step 257: 26112 + 102 = 26214
Step 258: 26214 + 102 = 26316
Step 259: 26316 + 102 = 26418
Step 260: 26418 + 102 = 26520
Step 261: 26520 + 102 = 26622

So, 102*261 = 26622