OK, let's crack this. We're given 52 and our task is to multiply it by 402. Essentially, we'll be adding 52 to itself 402 times.
Step 1: 0 + 52 = 52
Step 2: 52 + 52 = 104
Step 3: 104 + 52 = 156
Step 4: 156 + 52 = 208
Step 5: 208 + 52 = 260
Step 6: 260 + 52 = 312
Step 7: 312 + 52 = 364
Step 8: 364 + 52 = 416
Step 9: 416 + 52 = 468
Step 10: 468 + 52 = 520
Step 11: 520 + 52 = 572
Step 12: 572 + 52 = 624
Step 13: 624 + 52 = 676
Step 14: 676 + 52 = 728
Step 15: 728 + 52 = 780
Step 16: 780 + 52 = 832
Step 17: 832 + 52 = 884
Step 18: 884 + 52 = 936
Step 19: 936 + 52 = 988
Step 20: 988 + 52 = 1040
Step 21: 1040 + 52 = 1092
Step 22: 1092 + 52 = 1144
Step 23: 1144 + 52 = 1196
Step 24: 1196 + 52 = 1248
Step 25: 1248 + 52 = 1300
Step 26: 1300 + 52 = 1352
Step 27: 1352 + 52 = 1404
Step 28: 1404 + 52 = 1456
Step 29: 1456 + 52 = 1508
Step 30: 1508 + 52 = 1560
Step 31: 1560 + 52 = 1612
Step 32: 1612 + 52 = 1664
Step 33: 1664 + 52 = 1716
Step 34: 1716 + 52 = 1768
Step 35: 1768 + 52 = 1820
Step 36: 1820 + 52 = 1872
Step 37: 1872 + 52 = 1924
Step 38: 1924 + 52 = 1976
Step 39: 1976 + 52 = 2028
Step 40: 2028 + 52 = 2080
Step 41: 2080 + 52 = 2132
Step 42: 2132 + 52 = 2184
Step 43: 2184 + 52 = 2236
Step 44: 2236 + 52 = 2288
Step 45: 2288 + 52 = 2340
Step 46: 2340 + 52 = 2392
Step 47: 2392 + 52 = 2444
Step 48: 2444 + 52 = 2496
Step 49: 2496 + 52 = 2548
Step 50: 2548 + 52 = 2600
Step 51: 2600 + 52 = 2652
Step 52: 2652 + 52 = 2704
Step 53: 2704 + 52 = 2756
Step 54: 2756 + 52 = 2808
Step 55: 2808 + 52 = 2860
Step 56: 2860 + 52 = 2912
Step 57: 2912 + 52 = 2964
Step 58: 2964 + 52 = 3016
Step 59: 3016 + 52 = 3068
Step 60: 3068 + 52 = 3120
Step 61: 3120 + 52 = 3172
Step 62: 3172 + 52 = 3224
Step 63: 3224 + 52 = 3276
Step 64: 3276 + 52 = 3328
Step 65: 3328 + 52 = 3380
Step 66: 3380 + 52 = 3432
Step 67: 3432 + 52 = 3484
Step 68: 3484 + 52 = 3536
Step 69: 3536 + 52 = 3588
Step 70: 3588 + 52 = 3640
Step 71: 3640 + 52 = 3692
Step 72: 3692 + 52 = 3744
Step 73: 3744 + 52 = 3796
Step 74: 3796 + 52 = 3848
Step 75: 3848 + 52 = 3900
Step 76: 3900 + 52 = 3952
Step 77: 3952 + 52 = 4004
Step 78: 4004 + 52 = 4056
Step 79: 4056 + 52 = 4108
Step 80: 4108 + 52 = 4160
Step 81: 4160 + 52 = 4212
Step 82: 4212 + 52 = 4264
Step 83: 4264 + 52 = 4316
Step 84: 4316 + 52 = 4368
Step 85: 4368 + 52 = 4420
Step 86: 4420 + 52 = 4472
Step 87: 4472 + 52 = 4524
Step 88: 4524 + 52 = 4576
Step 89: 4576 + 52 = 4628
Step 90: 4628 + 52 = 4680
Step 91: 4680 + 52 = 4732
Step 92: 4732 + 52 = 4784
Step 93: 4784 + 52 = 4836
Step 94: 4836 + 52 = 4888
Step 95: 4888 + 52 = 4940
Step 96: 4940 + 52 = 4992
Step 97: 4992 + 52 = 5044
Step 98: 5044 + 52 = 5096
Step 99: 5096 + 52 = 5148
Step 100: 5148 + 52 = 5200
Step 101: 5200 + 52 = 5252
Step 102: 5252 + 52 = 5304
Step 103: 5304 + 52 = 5356
Step 104: 5356 + 52 = 5408
Step 105: 5408 + 52 = 5460
Step 106: 5460 + 52 = 5512
Step 107: 5512 + 52 = 5564
Step 108: 5564 + 52 = 5616
Step 109: 5616 + 52 = 5668
Step 110: 5668 + 52 = 5720
Step 111: 5720 + 52 = 5772
Step 112: 5772 + 52 = 5824
Step 113: 5824 + 52 = 5876
Step 114: 5876 + 52 = 5928
Step 115: 5928 + 52 = 5980
Step 116: 5980 + 52 = 6032
Step 117: 6032 + 52 = 6084
Step 118: 6084 + 52 = 6136
Step 119: 6136 + 52 = 6188
Step 120: 6188 + 52 = 6240
Step 121: 6240 + 52 = 6292
Step 122: 6292 + 52 = 6344
Step 123: 6344 + 52 = 6396
Step 124: 6396 + 52 = 6448
Step 125: 6448 + 52 = 6500
Step 126: 6500 + 52 = 6552
Step 127: 6552 + 52 = 6604
Step 128: 6604 + 52 = 6656
Step 129: 6656 + 52 = 6708
Step 130: 6708 + 52 = 6760
Step 131: 6760 + 52 = 6812
Step 132: 6812 + 52 = 6864
Step 133: 6864 + 52 = 6916
Step 134: 6916 + 52 = 6968
Step 135: 6968 + 52 = 7020
Step 136: 7020 + 52 = 7072
Step 137: 7072 + 52 = 7124
Step 138: 7124 + 52 = 7176
Step 139: 7176 + 52 = 7228
Step 140: 7228 + 52 = 7280
Step 141: 7280 + 52 = 7332
Step 142: 7332 + 52 = 7384
Step 143: 7384 + 52 = 7436
Step 144: 7436 + 52 = 7488
Step 145: 7488 + 52 = 7540
Step 146: 7540 + 52 = 7592
Step 147: 7592 + 52 = 7644
Step 148: 7644 + 52 = 7696
Step 149: 7696 + 52 = 7748
Step 150: 7748 + 52 = 7800
Step 151: 7800 + 52 = 7852
Step 152: 7852 + 52 = 7904
Step 153: 7904 + 52 = 7956
Step 154: 7956 + 52 = 8008
Step 155: 8008 + 52 = 8060
Step 156: 8060 + 52 = 8112
Step 157: 8112 + 52 = 8164
Step 158: 8164 + 52 = 8216
Step 159: 8216 + 52 = 8268
Step 160: 8268 + 52 = 8320
Step 161: 8320 + 52 = 8372
Step 162: 8372 + 52 = 8424
Step 163: 8424 + 52 = 8476
Step 164: 8476 + 52 = 8528
Step 165: 8528 + 52 = 8580
Step 166: 8580 + 52 = 8632
Step 167: 8632 + 52 = 8684
Step 168: 8684 + 52 = 8736
Step 169: 8736 + 52 = 8788
Step 170: 8788 + 52 = 8840
Step 171: 8840 + 52 = 8892
Step 172: 8892 + 52 = 8944
Step 173: 8944 + 52 = 8996
Step 174: 8996 + 52 = 9048
Step 175: 9048 + 52 = 9100
Step 176: 9100 + 52 = 9152
Step 177: 9152 + 52 = 9204
Step 178: 9204 + 52 = 9256
Step 179: 9256 + 52 = 9308
Step 180: 9308 + 52 = 9360
Step 181: 9360 + 52 = 9412
Step 182: 9412 + 52 = 9464
Step 183: 9464 + 52 = 9516
Step 184: 9516 + 52 = 9568
Step 185: 9568 + 52 = 9620
Step 186: 9620 + 52 = 9672
Step 187: 9672 + 52 = 9724
Step 188: 9724 + 52 = 9776
Step 189: 9776 + 52 = 9828
Step 190: 9828 + 52 = 9880
Step 191: 9880 + 52 = 9932
Step 192: 9932 + 52 = 9984
Step 193: 9984 + 52 = 10036
Step 194: 10036 + 52 = 10088
Step 195: 10088 + 52 = 10140
Step 196: 10140 + 52 = 10192
Step 197: 10192 + 52 = 10244
Step 198: 10244 + 52 = 10296
Step 199: 10296 + 52 = 10348
Step 200: 10348 + 52 = 10400
Step 201: 10400 + 52 = 10452
Step 202: 10452 + 52 = 10504
Step 203: 10504 + 52 = 10556
Step 204: 10556 + 52 = 10608
Step 205: 10608 + 52 = 10660
Step 206: 10660 + 52 = 10712
Step 207: 10712 + 52 = 10764
Step 208: 10764 + 52 = 10816
Step 209: 10816 + 52 = 10868
Step 210: 10868 + 52 = 10920
Step 211: 10920 + 52 = 10972
Step 212: 10972 + 52 = 11024
Step 213: 11024 + 52 = 11076
Step 214: 11076 + 52 = 11128
Step 215: 11128 + 52 = 11180
Step 216: 11180 + 52 = 11232
Step 217: 11232 + 52 = 11284
Step 218: 11284 + 52 = 11336
Step 219: 11336 + 52 = 11388
Step 220: 11388 + 52 = 11440
Step 221: 11440 + 52 = 11492
Step 222: 11492 + 52 = 11544
Step 223: 11544 + 52 = 11596
Step 224: 11596 + 52 = 11648
Step 225: 11648 + 52 = 11700
Step 226: 11700 + 52 = 11752
Step 227: 11752 + 52 = 11804
Step 228: 11804 + 52 = 11856
Step 229: 11856 + 52 = 11908
Step 230: 11908 + 52 = 11960
Step 231: 11960 + 52 = 12012
Step 232: 12012 + 52 = 12064
Step 233: 12064 + 52 = 12116
Step 234: 12116 + 52 = 12168
Step 235: 12168 + 52 = 12220
Step 236: 12220 + 52 = 12272
Step 237: 12272 + 52 = 12324
Step 238: 12324 + 52 = 12376
Step 239: 12376 + 52 = 12428
Step 240: 12428 + 52 = 12480
Step 241: 12480 + 52 = 12532
Step 242: 12532 + 52 = 12584
Step 243: 12584 + 52 = 12636
Step 244: 12636 + 52 = 12688
Step 245: 12688 + 52 = 12740
Step 246: 12740 + 52 = 12792
Step 247: 12792 + 52 = 12844
Step 248: 12844 + 52 = 12896
Step 249: 12896 + 52 = 12948
Step 250: 12948 + 52 = 13000
Step 251: 13000 + 52 = 13052
Step 252: 13052 + 52 = 13104
Step 253: 13104 + 52 = 13156
Step 254: 13156 + 52 = 13208
Step 255: 13208 + 52 = 13260
Step 256: 13260 + 52 = 13312
Step 257: 13312 + 52 = 13364
Step 258: 13364 + 52 = 13416
Step 259: 13416 + 52 = 13468
Step 260: 13468 + 52 = 13520
Step 261: 13520 + 52 = 13572
Step 262: 13572 + 52 = 13624
Step 263: 13624 + 52 = 13676
Step 264: 13676 + 52 = 13728
Step 265: 13728 + 52 = 13780
Step 266: 13780 + 52 = 13832
Step 267: 13832 + 52 = 13884
Step 268: 13884 + 52 = 13936
Step 269: 13936 + 52 = 13988
Step 270: 13988 + 52 = 14040
Step 271: 14040 + 52 = 14092
Step 272: 14092 + 52 = 14144
Step 273: 14144 + 52 = 14196
Step 274: 14196 + 52 = 14248
Step 275: 14248 + 52 = 14300
Step 276: 14300 + 52 = 14352
Step 277: 14352 + 52 = 14404
Step 278: 14404 + 52 = 14456
Step 279: 14456 + 52 = 14508
Step 280: 14508 + 52 = 14560
Step 281: 14560 + 52 = 14612
Step 282: 14612 + 52 = 14664
Step 283: 14664 + 52 = 14716
Step 284: 14716 + 52 = 14768
Step 285: 14768 + 52 = 14820
Step 286: 14820 + 52 = 14872
Step 287: 14872 + 52 = 14924
Step 288: 14924 + 52 = 14976
Step 289: 14976 + 52 = 15028
Step 290: 15028 + 52 = 15080
Step 291: 15080 + 52 = 15132
Step 292: 15132 + 52 = 15184
Step 293: 15184 + 52 = 15236
Step 294: 15236 + 52 = 15288
Step 295: 15288 + 52 = 15340
Step 296: 15340 + 52 = 15392
Step 297: 15392 + 52 = 15444
Step 298: 15444 + 52 = 15496
Step 299: 15496 + 52 = 15548
Step 300: 15548 + 52 = 15600
Step 301: 15600 + 52 = 15652
Step 302: 15652 + 52 = 15704
Step 303: 15704 + 52 = 15756
Step 304: 15756 + 52 = 15808
Step 305: 15808 + 52 = 15860
Step 306: 15860 + 52 = 15912
Step 307: 15912 + 52 = 15964
Step 308: 15964 + 52 = 16016
Step 309: 16016 + 52 = 16068
Step 310: 16068 + 52 = 16120
Step 311: 16120 + 52 = 16172
Step 312: 16172 + 52 = 16224
Step 313: 16224 + 52 = 16276
Step 314: 16276 + 52 = 16328
Step 315: 16328 + 52 = 16380
Step 316: 16380 + 52 = 16432
Step 317: 16432 + 52 = 16484
Step 318: 16484 + 52 = 16536
Step 319: 16536 + 52 = 16588
Step 320: 16588 + 52 = 16640
Step 321: 16640 + 52 = 16692
Step 322: 16692 + 52 = 16744
Step 323: 16744 + 52 = 16796
Step 324: 16796 + 52 = 16848
Step 325: 16848 + 52 = 16900
Step 326: 16900 + 52 = 16952
Step 327: 16952 + 52 = 17004
Step 328: 17004 + 52 = 17056
Step 329: 17056 + 52 = 17108
Step 330: 17108 + 52 = 17160
Step 331: 17160 + 52 = 17212
Step 332: 17212 + 52 = 17264
Step 333: 17264 + 52 = 17316
Step 334: 17316 + 52 = 17368
Step 335: 17368 + 52 = 17420
Step 336: 17420 + 52 = 17472
Step 337: 17472 + 52 = 17524
Step 338: 17524 + 52 = 17576
Step 339: 17576 + 52 = 17628
Step 340: 17628 + 52 = 17680
Step 341: 17680 + 52 = 17732
Step 342: 17732 + 52 = 17784
Step 343: 17784 + 52 = 17836
Step 344: 17836 + 52 = 17888
Step 345: 17888 + 52 = 17940
Step 346: 17940 + 52 = 17992
Step 347: 17992 + 52 = 18044
Step 348: 18044 + 52 = 18096
Step 349: 18096 + 52 = 18148
Step 350: 18148 + 52 = 18200
Step 351: 18200 + 52 = 18252
Step 352: 18252 + 52 = 18304
Step 353: 18304 + 52 = 18356
Step 354: 18356 + 52 = 18408
Step 355: 18408 + 52 = 18460
Step 356: 18460 + 52 = 18512
Step 357: 18512 + 52 = 18564
Step 358: 18564 + 52 = 18616
Step 359: 18616 + 52 = 18668
Step 360: 18668 + 52 = 18720
Step 361: 18720 + 52 = 18772
Step 362: 18772 + 52 = 18824
Step 363: 18824 + 52 = 18876
Step 364: 18876 + 52 = 18928
Step 365: 18928 + 52 = 18980
Step 366: 18980 + 52 = 19032
Step 367: 19032 + 52 = 19084
Step 368: 19084 + 52 = 19136
Step 369: 19136 + 52 = 19188
Step 370: 19188 + 52 = 19240
Step 371: 19240 + 52 = 19292
Step 372: 19292 + 52 = 19344
Step 373: 19344 + 52 = 19396
Step 374: 19396 + 52 = 19448
Step 375: 19448 + 52 = 19500
Step 376: 19500 + 52 = 19552
Step 377: 19552 + 52 = 19604
Step 378: 19604 + 52 = 19656
Step 379: 19656 + 52 = 19708
Step 380: 19708 + 52 = 19760
Step 381: 19760 + 52 = 19812
Step 382: 19812 + 52 = 19864
Step 383: 19864 + 52 = 19916
Step 384: 19916 + 52 = 19968
Step 385: 19968 + 52 = 20020
Step 386: 20020 + 52 = 20072
Step 387: 20072 + 52 = 20124
Step 388: 20124 + 52 = 20176
Step 389: 20176 + 52 = 20228
Step 390: 20228 + 52 = 20280
Step 391: 20280 + 52 = 20332
Step 392: 20332 + 52 = 20384
Step 393: 20384 + 52 = 20436
Step 394: 20436 + 52 = 20488
Step 395: 20488 + 52 = 20540
Step 396: 20540 + 52 = 20592
Step 397: 20592 + 52 = 20644
Step 398: 20644 + 52 = 20696
Step 399: 20696 + 52 = 20748
Step 400: 20748 + 52 = 20800
Step 401: 20800 + 52 = 20852
Step 402: 20852 + 52 = 20904

So, 52*402 = 20904