Let's roll up our sleeves and solve this. We have 51 and we're going to multiply it by 260, essentially adding 51 to itself 260 times.
Step 1: 0 + 51 = 51
Step 2: 51 + 51 = 102
Step 3: 102 + 51 = 153
Step 4: 153 + 51 = 204
Step 5: 204 + 51 = 255
Step 6: 255 + 51 = 306
Step 7: 306 + 51 = 357
Step 8: 357 + 51 = 408
Step 9: 408 + 51 = 459
Step 10: 459 + 51 = 510
Step 11: 510 + 51 = 561
Step 12: 561 + 51 = 612
Step 13: 612 + 51 = 663
Step 14: 663 + 51 = 714
Step 15: 714 + 51 = 765
Step 16: 765 + 51 = 816
Step 17: 816 + 51 = 867
Step 18: 867 + 51 = 918
Step 19: 918 + 51 = 969
Step 20: 969 + 51 = 1020
Step 21: 1020 + 51 = 1071
Step 22: 1071 + 51 = 1122
Step 23: 1122 + 51 = 1173
Step 24: 1173 + 51 = 1224
Step 25: 1224 + 51 = 1275
Step 26: 1275 + 51 = 1326
Step 27: 1326 + 51 = 1377
Step 28: 1377 + 51 = 1428
Step 29: 1428 + 51 = 1479
Step 30: 1479 + 51 = 1530
Step 31: 1530 + 51 = 1581
Step 32: 1581 + 51 = 1632
Step 33: 1632 + 51 = 1683
Step 34: 1683 + 51 = 1734
Step 35: 1734 + 51 = 1785
Step 36: 1785 + 51 = 1836
Step 37: 1836 + 51 = 1887
Step 38: 1887 + 51 = 1938
Step 39: 1938 + 51 = 1989
Step 40: 1989 + 51 = 2040
Step 41: 2040 + 51 = 2091
Step 42: 2091 + 51 = 2142
Step 43: 2142 + 51 = 2193
Step 44: 2193 + 51 = 2244
Step 45: 2244 + 51 = 2295
Step 46: 2295 + 51 = 2346
Step 47: 2346 + 51 = 2397
Step 48: 2397 + 51 = 2448
Step 49: 2448 + 51 = 2499
Step 50: 2499 + 51 = 2550
Step 51: 2550 + 51 = 2601
Step 52: 2601 + 51 = 2652
Step 53: 2652 + 51 = 2703
Step 54: 2703 + 51 = 2754
Step 55: 2754 + 51 = 2805
Step 56: 2805 + 51 = 2856
Step 57: 2856 + 51 = 2907
Step 58: 2907 + 51 = 2958
Step 59: 2958 + 51 = 3009
Step 60: 3009 + 51 = 3060
Step 61: 3060 + 51 = 3111
Step 62: 3111 + 51 = 3162
Step 63: 3162 + 51 = 3213
Step 64: 3213 + 51 = 3264
Step 65: 3264 + 51 = 3315
Step 66: 3315 + 51 = 3366
Step 67: 3366 + 51 = 3417
Step 68: 3417 + 51 = 3468
Step 69: 3468 + 51 = 3519
Step 70: 3519 + 51 = 3570
Step 71: 3570 + 51 = 3621
Step 72: 3621 + 51 = 3672
Step 73: 3672 + 51 = 3723
Step 74: 3723 + 51 = 3774
Step 75: 3774 + 51 = 3825
Step 76: 3825 + 51 = 3876
Step 77: 3876 + 51 = 3927
Step 78: 3927 + 51 = 3978
Step 79: 3978 + 51 = 4029
Step 80: 4029 + 51 = 4080
Step 81: 4080 + 51 = 4131
Step 82: 4131 + 51 = 4182
Step 83: 4182 + 51 = 4233
Step 84: 4233 + 51 = 4284
Step 85: 4284 + 51 = 4335
Step 86: 4335 + 51 = 4386
Step 87: 4386 + 51 = 4437
Step 88: 4437 + 51 = 4488
Step 89: 4488 + 51 = 4539
Step 90: 4539 + 51 = 4590
Step 91: 4590 + 51 = 4641
Step 92: 4641 + 51 = 4692
Step 93: 4692 + 51 = 4743
Step 94: 4743 + 51 = 4794
Step 95: 4794 + 51 = 4845
Step 96: 4845 + 51 = 4896
Step 97: 4896 + 51 = 4947
Step 98: 4947 + 51 = 4998
Step 99: 4998 + 51 = 5049
Step 100: 5049 + 51 = 5100
Step 101: 5100 + 51 = 5151
Step 102: 5151 + 51 = 5202
Step 103: 5202 + 51 = 5253
Step 104: 5253 + 51 = 5304
Step 105: 5304 + 51 = 5355
Step 106: 5355 + 51 = 5406
Step 107: 5406 + 51 = 5457
Step 108: 5457 + 51 = 5508
Step 109: 5508 + 51 = 5559
Step 110: 5559 + 51 = 5610
Step 111: 5610 + 51 = 5661
Step 112: 5661 + 51 = 5712
Step 113: 5712 + 51 = 5763
Step 114: 5763 + 51 = 5814
Step 115: 5814 + 51 = 5865
Step 116: 5865 + 51 = 5916
Step 117: 5916 + 51 = 5967
Step 118: 5967 + 51 = 6018
Step 119: 6018 + 51 = 6069
Step 120: 6069 + 51 = 6120
Step 121: 6120 + 51 = 6171
Step 122: 6171 + 51 = 6222
Step 123: 6222 + 51 = 6273
Step 124: 6273 + 51 = 6324
Step 125: 6324 + 51 = 6375
Step 126: 6375 + 51 = 6426
Step 127: 6426 + 51 = 6477
Step 128: 6477 + 51 = 6528
Step 129: 6528 + 51 = 6579
Step 130: 6579 + 51 = 6630
Step 131: 6630 + 51 = 6681
Step 132: 6681 + 51 = 6732
Step 133: 6732 + 51 = 6783
Step 134: 6783 + 51 = 6834
Step 135: 6834 + 51 = 6885
Step 136: 6885 + 51 = 6936
Step 137: 6936 + 51 = 6987
Step 138: 6987 + 51 = 7038
Step 139: 7038 + 51 = 7089
Step 140: 7089 + 51 = 7140
Step 141: 7140 + 51 = 7191
Step 142: 7191 + 51 = 7242
Step 143: 7242 + 51 = 7293
Step 144: 7293 + 51 = 7344
Step 145: 7344 + 51 = 7395
Step 146: 7395 + 51 = 7446
Step 147: 7446 + 51 = 7497
Step 148: 7497 + 51 = 7548
Step 149: 7548 + 51 = 7599
Step 150: 7599 + 51 = 7650
Step 151: 7650 + 51 = 7701
Step 152: 7701 + 51 = 7752
Step 153: 7752 + 51 = 7803
Step 154: 7803 + 51 = 7854
Step 155: 7854 + 51 = 7905
Step 156: 7905 + 51 = 7956
Step 157: 7956 + 51 = 8007
Step 158: 8007 + 51 = 8058
Step 159: 8058 + 51 = 8109
Step 160: 8109 + 51 = 8160
Step 161: 8160 + 51 = 8211
Step 162: 8211 + 51 = 8262
Step 163: 8262 + 51 = 8313
Step 164: 8313 + 51 = 8364
Step 165: 8364 + 51 = 8415
Step 166: 8415 + 51 = 8466
Step 167: 8466 + 51 = 8517
Step 168: 8517 + 51 = 8568
Step 169: 8568 + 51 = 8619
Step 170: 8619 + 51 = 8670
Step 171: 8670 + 51 = 8721
Step 172: 8721 + 51 = 8772
Step 173: 8772 + 51 = 8823
Step 174: 8823 + 51 = 8874
Step 175: 8874 + 51 = 8925
Step 176: 8925 + 51 = 8976
Step 177: 8976 + 51 = 9027
Step 178: 9027 + 51 = 9078
Step 179: 9078 + 51 = 9129
Step 180: 9129 + 51 = 9180
Step 181: 9180 + 51 = 9231
Step 182: 9231 + 51 = 9282
Step 183: 9282 + 51 = 9333
Step 184: 9333 + 51 = 9384
Step 185: 9384 + 51 = 9435
Step 186: 9435 + 51 = 9486
Step 187: 9486 + 51 = 9537
Step 188: 9537 + 51 = 9588
Step 189: 9588 + 51 = 9639
Step 190: 9639 + 51 = 9690
Step 191: 9690 + 51 = 9741
Step 192: 9741 + 51 = 9792
Step 193: 9792 + 51 = 9843
Step 194: 9843 + 51 = 9894
Step 195: 9894 + 51 = 9945
Step 196: 9945 + 51 = 9996
Step 197: 9996 + 51 = 10047
Step 198: 10047 + 51 = 10098
Step 199: 10098 + 51 = 10149
Step 200: 10149 + 51 = 10200
Step 201: 10200 + 51 = 10251
Step 202: 10251 + 51 = 10302
Step 203: 10302 + 51 = 10353
Step 204: 10353 + 51 = 10404
Step 205: 10404 + 51 = 10455
Step 206: 10455 + 51 = 10506
Step 207: 10506 + 51 = 10557
Step 208: 10557 + 51 = 10608
Step 209: 10608 + 51 = 10659
Step 210: 10659 + 51 = 10710
Step 211: 10710 + 51 = 10761
Step 212: 10761 + 51 = 10812
Step 213: 10812 + 51 = 10863
Step 214: 10863 + 51 = 10914
Step 215: 10914 + 51 = 10965
Step 216: 10965 + 51 = 11016
Step 217: 11016 + 51 = 11067
Step 218: 11067 + 51 = 11118
Step 219: 11118 + 51 = 11169
Step 220: 11169 + 51 = 11220
Step 221: 11220 + 51 = 11271
Step 222: 11271 + 51 = 11322
Step 223: 11322 + 51 = 11373
Step 224: 11373 + 51 = 11424
Step 225: 11424 + 51 = 11475
Step 226: 11475 + 51 = 11526
Step 227: 11526 + 51 = 11577
Step 228: 11577 + 51 = 11628
Step 229: 11628 + 51 = 11679
Step 230: 11679 + 51 = 11730
Step 231: 11730 + 51 = 11781
Step 232: 11781 + 51 = 11832
Step 233: 11832 + 51 = 11883
Step 234: 11883 + 51 = 11934
Step 235: 11934 + 51 = 11985
Step 236: 11985 + 51 = 12036
Step 237: 12036 + 51 = 12087
Step 238: 12087 + 51 = 12138
Step 239: 12138 + 51 = 12189
Step 240: 12189 + 51 = 12240
Step 241: 12240 + 51 = 12291
Step 242: 12291 + 51 = 12342
Step 243: 12342 + 51 = 12393
Step 244: 12393 + 51 = 12444
Step 245: 12444 + 51 = 12495
Step 246: 12495 + 51 = 12546
Step 247: 12546 + 51 = 12597
Step 248: 12597 + 51 = 12648
Step 249: 12648 + 51 = 12699
Step 250: 12699 + 51 = 12750
Step 251: 12750 + 51 = 12801
Step 252: 12801 + 51 = 12852
Step 253: 12852 + 51 = 12903
Step 254: 12903 + 51 = 12954
Step 255: 12954 + 51 = 13005
Step 256: 13005 + 51 = 13056
Step 257: 13056 + 51 = 13107
Step 258: 13107 + 51 = 13158
Step 259: 13158 + 51 = 13209
Step 260: 13209 + 51 = 13260

So, 51*260 = 13260