Let's roll up our sleeves and solve this. We have 306 and we're going to multiply it by 452, essentially adding 306 to itself 452 times.
Step 1: 0 + 306 = 306
Step 2: 306 + 306 = 612
Step 3: 612 + 306 = 918
Step 4: 918 + 306 = 1224
Step 5: 1224 + 306 = 1530
Step 6: 1530 + 306 = 1836
Step 7: 1836 + 306 = 2142
Step 8: 2142 + 306 = 2448
Step 9: 2448 + 306 = 2754
Step 10: 2754 + 306 = 3060
Step 11: 3060 + 306 = 3366
Step 12: 3366 + 306 = 3672
Step 13: 3672 + 306 = 3978
Step 14: 3978 + 306 = 4284
Step 15: 4284 + 306 = 4590
Step 16: 4590 + 306 = 4896
Step 17: 4896 + 306 = 5202
Step 18: 5202 + 306 = 5508
Step 19: 5508 + 306 = 5814
Step 20: 5814 + 306 = 6120
Step 21: 6120 + 306 = 6426
Step 22: 6426 + 306 = 6732
Step 23: 6732 + 306 = 7038
Step 24: 7038 + 306 = 7344
Step 25: 7344 + 306 = 7650
Step 26: 7650 + 306 = 7956
Step 27: 7956 + 306 = 8262
Step 28: 8262 + 306 = 8568
Step 29: 8568 + 306 = 8874
Step 30: 8874 + 306 = 9180
Step 31: 9180 + 306 = 9486
Step 32: 9486 + 306 = 9792
Step 33: 9792 + 306 = 10098
Step 34: 10098 + 306 = 10404
Step 35: 10404 + 306 = 10710
Step 36: 10710 + 306 = 11016
Step 37: 11016 + 306 = 11322
Step 38: 11322 + 306 = 11628
Step 39: 11628 + 306 = 11934
Step 40: 11934 + 306 = 12240
Step 41: 12240 + 306 = 12546
Step 42: 12546 + 306 = 12852
Step 43: 12852 + 306 = 13158
Step 44: 13158 + 306 = 13464
Step 45: 13464 + 306 = 13770
Step 46: 13770 + 306 = 14076
Step 47: 14076 + 306 = 14382
Step 48: 14382 + 306 = 14688
Step 49: 14688 + 306 = 14994
Step 50: 14994 + 306 = 15300
Step 51: 15300 + 306 = 15606
Step 52: 15606 + 306 = 15912
Step 53: 15912 + 306 = 16218
Step 54: 16218 + 306 = 16524
Step 55: 16524 + 306 = 16830
Step 56: 16830 + 306 = 17136
Step 57: 17136 + 306 = 17442
Step 58: 17442 + 306 = 17748
Step 59: 17748 + 306 = 18054
Step 60: 18054 + 306 = 18360
Step 61: 18360 + 306 = 18666
Step 62: 18666 + 306 = 18972
Step 63: 18972 + 306 = 19278
Step 64: 19278 + 306 = 19584
Step 65: 19584 + 306 = 19890
Step 66: 19890 + 306 = 20196
Step 67: 20196 + 306 = 20502
Step 68: 20502 + 306 = 20808
Step 69: 20808 + 306 = 21114
Step 70: 21114 + 306 = 21420
Step 71: 21420 + 306 = 21726
Step 72: 21726 + 306 = 22032
Step 73: 22032 + 306 = 22338
Step 74: 22338 + 306 = 22644
Step 75: 22644 + 306 = 22950
Step 76: 22950 + 306 = 23256
Step 77: 23256 + 306 = 23562
Step 78: 23562 + 306 = 23868
Step 79: 23868 + 306 = 24174
Step 80: 24174 + 306 = 24480
Step 81: 24480 + 306 = 24786
Step 82: 24786 + 306 = 25092
Step 83: 25092 + 306 = 25398
Step 84: 25398 + 306 = 25704
Step 85: 25704 + 306 = 26010
Step 86: 26010 + 306 = 26316
Step 87: 26316 + 306 = 26622
Step 88: 26622 + 306 = 26928
Step 89: 26928 + 306 = 27234
Step 90: 27234 + 306 = 27540
Step 91: 27540 + 306 = 27846
Step 92: 27846 + 306 = 28152
Step 93: 28152 + 306 = 28458
Step 94: 28458 + 306 = 28764
Step 95: 28764 + 306 = 29070
Step 96: 29070 + 306 = 29376
Step 97: 29376 + 306 = 29682
Step 98: 29682 + 306 = 29988
Step 99: 29988 + 306 = 30294
Step 100: 30294 + 306 = 30600
Step 101: 30600 + 306 = 30906
Step 102: 30906 + 306 = 31212
Step 103: 31212 + 306 = 31518
Step 104: 31518 + 306 = 31824
Step 105: 31824 + 306 = 32130
Step 106: 32130 + 306 = 32436
Step 107: 32436 + 306 = 32742
Step 108: 32742 + 306 = 33048
Step 109: 33048 + 306 = 33354
Step 110: 33354 + 306 = 33660
Step 111: 33660 + 306 = 33966
Step 112: 33966 + 306 = 34272
Step 113: 34272 + 306 = 34578
Step 114: 34578 + 306 = 34884
Step 115: 34884 + 306 = 35190
Step 116: 35190 + 306 = 35496
Step 117: 35496 + 306 = 35802
Step 118: 35802 + 306 = 36108
Step 119: 36108 + 306 = 36414
Step 120: 36414 + 306 = 36720
Step 121: 36720 + 306 = 37026
Step 122: 37026 + 306 = 37332
Step 123: 37332 + 306 = 37638
Step 124: 37638 + 306 = 37944
Step 125: 37944 + 306 = 38250
Step 126: 38250 + 306 = 38556
Step 127: 38556 + 306 = 38862
Step 128: 38862 + 306 = 39168
Step 129: 39168 + 306 = 39474
Step 130: 39474 + 306 = 39780
Step 131: 39780 + 306 = 40086
Step 132: 40086 + 306 = 40392
Step 133: 40392 + 306 = 40698
Step 134: 40698 + 306 = 41004
Step 135: 41004 + 306 = 41310
Step 136: 41310 + 306 = 41616
Step 137: 41616 + 306 = 41922
Step 138: 41922 + 306 = 42228
Step 139: 42228 + 306 = 42534
Step 140: 42534 + 306 = 42840
Step 141: 42840 + 306 = 43146
Step 142: 43146 + 306 = 43452
Step 143: 43452 + 306 = 43758
Step 144: 43758 + 306 = 44064
Step 145: 44064 + 306 = 44370
Step 146: 44370 + 306 = 44676
Step 147: 44676 + 306 = 44982
Step 148: 44982 + 306 = 45288
Step 149: 45288 + 306 = 45594
Step 150: 45594 + 306 = 45900
Step 151: 45900 + 306 = 46206
Step 152: 46206 + 306 = 46512
Step 153: 46512 + 306 = 46818
Step 154: 46818 + 306 = 47124
Step 155: 47124 + 306 = 47430
Step 156: 47430 + 306 = 47736
Step 157: 47736 + 306 = 48042
Step 158: 48042 + 306 = 48348
Step 159: 48348 + 306 = 48654
Step 160: 48654 + 306 = 48960
Step 161: 48960 + 306 = 49266
Step 162: 49266 + 306 = 49572
Step 163: 49572 + 306 = 49878
Step 164: 49878 + 306 = 50184
Step 165: 50184 + 306 = 50490
Step 166: 50490 + 306 = 50796
Step 167: 50796 + 306 = 51102
Step 168: 51102 + 306 = 51408
Step 169: 51408 + 306 = 51714
Step 170: 51714 + 306 = 52020
Step 171: 52020 + 306 = 52326
Step 172: 52326 + 306 = 52632
Step 173: 52632 + 306 = 52938
Step 174: 52938 + 306 = 53244
Step 175: 53244 + 306 = 53550
Step 176: 53550 + 306 = 53856
Step 177: 53856 + 306 = 54162
Step 178: 54162 + 306 = 54468
Step 179: 54468 + 306 = 54774
Step 180: 54774 + 306 = 55080
Step 181: 55080 + 306 = 55386
Step 182: 55386 + 306 = 55692
Step 183: 55692 + 306 = 55998
Step 184: 55998 + 306 = 56304
Step 185: 56304 + 306 = 56610
Step 186: 56610 + 306 = 56916
Step 187: 56916 + 306 = 57222
Step 188: 57222 + 306 = 57528
Step 189: 57528 + 306 = 57834
Step 190: 57834 + 306 = 58140
Step 191: 58140 + 306 = 58446
Step 192: 58446 + 306 = 58752
Step 193: 58752 + 306 = 59058
Step 194: 59058 + 306 = 59364
Step 195: 59364 + 306 = 59670
Step 196: 59670 + 306 = 59976
Step 197: 59976 + 306 = 60282
Step 198: 60282 + 306 = 60588
Step 199: 60588 + 306 = 60894
Step 200: 60894 + 306 = 61200
Step 201: 61200 + 306 = 61506
Step 202: 61506 + 306 = 61812
Step 203: 61812 + 306 = 62118
Step 204: 62118 + 306 = 62424
Step 205: 62424 + 306 = 62730
Step 206: 62730 + 306 = 63036
Step 207: 63036 + 306 = 63342
Step 208: 63342 + 306 = 63648
Step 209: 63648 + 306 = 63954
Step 210: 63954 + 306 = 64260
Step 211: 64260 + 306 = 64566
Step 212: 64566 + 306 = 64872
Step 213: 64872 + 306 = 65178
Step 214: 65178 + 306 = 65484
Step 215: 65484 + 306 = 65790
Step 216: 65790 + 306 = 66096
Step 217: 66096 + 306 = 66402
Step 218: 66402 + 306 = 66708
Step 219: 66708 + 306 = 67014
Step 220: 67014 + 306 = 67320
Step 221: 67320 + 306 = 67626
Step 222: 67626 + 306 = 67932
Step 223: 67932 + 306 = 68238
Step 224: 68238 + 306 = 68544
Step 225: 68544 + 306 = 68850
Step 226: 68850 + 306 = 69156
Step 227: 69156 + 306 = 69462
Step 228: 69462 + 306 = 69768
Step 229: 69768 + 306 = 70074
Step 230: 70074 + 306 = 70380
Step 231: 70380 + 306 = 70686
Step 232: 70686 + 306 = 70992
Step 233: 70992 + 306 = 71298
Step 234: 71298 + 306 = 71604
Step 235: 71604 + 306 = 71910
Step 236: 71910 + 306 = 72216
Step 237: 72216 + 306 = 72522
Step 238: 72522 + 306 = 72828
Step 239: 72828 + 306 = 73134
Step 240: 73134 + 306 = 73440
Step 241: 73440 + 306 = 73746
Step 242: 73746 + 306 = 74052
Step 243: 74052 + 306 = 74358
Step 244: 74358 + 306 = 74664
Step 245: 74664 + 306 = 74970
Step 246: 74970 + 306 = 75276
Step 247: 75276 + 306 = 75582
Step 248: 75582 + 306 = 75888
Step 249: 75888 + 306 = 76194
Step 250: 76194 + 306 = 76500
Step 251: 76500 + 306 = 76806
Step 252: 76806 + 306 = 77112
Step 253: 77112 + 306 = 77418
Step 254: 77418 + 306 = 77724
Step 255: 77724 + 306 = 78030
Step 256: 78030 + 306 = 78336
Step 257: 78336 + 306 = 78642
Step 258: 78642 + 306 = 78948
Step 259: 78948 + 306 = 79254
Step 260: 79254 + 306 = 79560
Step 261: 79560 + 306 = 79866
Step 262: 79866 + 306 = 80172
Step 263: 80172 + 306 = 80478
Step 264: 80478 + 306 = 80784
Step 265: 80784 + 306 = 81090
Step 266: 81090 + 306 = 81396
Step 267: 81396 + 306 = 81702
Step 268: 81702 + 306 = 82008
Step 269: 82008 + 306 = 82314
Step 270: 82314 + 306 = 82620
Step 271: 82620 + 306 = 82926
Step 272: 82926 + 306 = 83232
Step 273: 83232 + 306 = 83538
Step 274: 83538 + 306 = 83844
Step 275: 83844 + 306 = 84150
Step 276: 84150 + 306 = 84456
Step 277: 84456 + 306 = 84762
Step 278: 84762 + 306 = 85068
Step 279: 85068 + 306 = 85374
Step 280: 85374 + 306 = 85680
Step 281: 85680 + 306 = 85986
Step 282: 85986 + 306 = 86292
Step 283: 86292 + 306 = 86598
Step 284: 86598 + 306 = 86904
Step 285: 86904 + 306 = 87210
Step 286: 87210 + 306 = 87516
Step 287: 87516 + 306 = 87822
Step 288: 87822 + 306 = 88128
Step 289: 88128 + 306 = 88434
Step 290: 88434 + 306 = 88740
Step 291: 88740 + 306 = 89046
Step 292: 89046 + 306 = 89352
Step 293: 89352 + 306 = 89658
Step 294: 89658 + 306 = 89964
Step 295: 89964 + 306 = 90270
Step 296: 90270 + 306 = 90576
Step 297: 90576 + 306 = 90882
Step 298: 90882 + 306 = 91188
Step 299: 91188 + 306 = 91494
Step 300: 91494 + 306 = 91800
Step 301: 91800 + 306 = 92106
Step 302: 92106 + 306 = 92412
Step 303: 92412 + 306 = 92718
Step 304: 92718 + 306 = 93024
Step 305: 93024 + 306 = 93330
Step 306: 93330 + 306 = 93636
Step 307: 93636 + 306 = 93942
Step 308: 93942 + 306 = 94248
Step 309: 94248 + 306 = 94554
Step 310: 94554 + 306 = 94860
Step 311: 94860 + 306 = 95166
Step 312: 95166 + 306 = 95472
Step 313: 95472 + 306 = 95778
Step 314: 95778 + 306 = 96084
Step 315: 96084 + 306 = 96390
Step 316: 96390 + 306 = 96696
Step 317: 96696 + 306 = 97002
Step 318: 97002 + 306 = 97308
Step 319: 97308 + 306 = 97614
Step 320: 97614 + 306 = 97920
Step 321: 97920 + 306 = 98226
Step 322: 98226 + 306 = 98532
Step 323: 98532 + 306 = 98838
Step 324: 98838 + 306 = 99144
Step 325: 99144 + 306 = 99450
Step 326: 99450 + 306 = 99756
Step 327: 99756 + 306 = 100062
Step 328: 100062 + 306 = 100368
Step 329: 100368 + 306 = 100674
Step 330: 100674 + 306 = 100980
Step 331: 100980 + 306 = 101286
Step 332: 101286 + 306 = 101592
Step 333: 101592 + 306 = 101898
Step 334: 101898 + 306 = 102204
Step 335: 102204 + 306 = 102510
Step 336: 102510 + 306 = 102816
Step 337: 102816 + 306 = 103122
Step 338: 103122 + 306 = 103428
Step 339: 103428 + 306 = 103734
Step 340: 103734 + 306 = 104040
Step 341: 104040 + 306 = 104346
Step 342: 104346 + 306 = 104652
Step 343: 104652 + 306 = 104958
Step 344: 104958 + 306 = 105264
Step 345: 105264 + 306 = 105570
Step 346: 105570 + 306 = 105876
Step 347: 105876 + 306 = 106182
Step 348: 106182 + 306 = 106488
Step 349: 106488 + 306 = 106794
Step 350: 106794 + 306 = 107100
Step 351: 107100 + 306 = 107406
Step 352: 107406 + 306 = 107712
Step 353: 107712 + 306 = 108018
Step 354: 108018 + 306 = 108324
Step 355: 108324 + 306 = 108630
Step 356: 108630 + 306 = 108936
Step 357: 108936 + 306 = 109242
Step 358: 109242 + 306 = 109548
Step 359: 109548 + 306 = 109854
Step 360: 109854 + 306 = 110160
Step 361: 110160 + 306 = 110466
Step 362: 110466 + 306 = 110772
Step 363: 110772 + 306 = 111078
Step 364: 111078 + 306 = 111384
Step 365: 111384 + 306 = 111690
Step 366: 111690 + 306 = 111996
Step 367: 111996 + 306 = 112302
Step 368: 112302 + 306 = 112608
Step 369: 112608 + 306 = 112914
Step 370: 112914 + 306 = 113220
Step 371: 113220 + 306 = 113526
Step 372: 113526 + 306 = 113832
Step 373: 113832 + 306 = 114138
Step 374: 114138 + 306 = 114444
Step 375: 114444 + 306 = 114750
Step 376: 114750 + 306 = 115056
Step 377: 115056 + 306 = 115362
Step 378: 115362 + 306 = 115668
Step 379: 115668 + 306 = 115974
Step 380: 115974 + 306 = 116280
Step 381: 116280 + 306 = 116586
Step 382: 116586 + 306 = 116892
Step 383: 116892 + 306 = 117198
Step 384: 117198 + 306 = 117504
Step 385: 117504 + 306 = 117810
Step 386: 117810 + 306 = 118116
Step 387: 118116 + 306 = 118422
Step 388: 118422 + 306 = 118728
Step 389: 118728 + 306 = 119034
Step 390: 119034 + 306 = 119340
Step 391: 119340 + 306 = 119646
Step 392: 119646 + 306 = 119952
Step 393: 119952 + 306 = 120258
Step 394: 120258 + 306 = 120564
Step 395: 120564 + 306 = 120870
Step 396: 120870 + 306 = 121176
Step 397: 121176 + 306 = 121482
Step 398: 121482 + 306 = 121788
Step 399: 121788 + 306 = 122094
Step 400: 122094 + 306 = 122400
Step 401: 122400 + 306 = 122706
Step 402: 122706 + 306 = 123012
Step 403: 123012 + 306 = 123318
Step 404: 123318 + 306 = 123624
Step 405: 123624 + 306 = 123930
Step 406: 123930 + 306 = 124236
Step 407: 124236 + 306 = 124542
Step 408: 124542 + 306 = 124848
Step 409: 124848 + 306 = 125154
Step 410: 125154 + 306 = 125460
Step 411: 125460 + 306 = 125766
Step 412: 125766 + 306 = 126072
Step 413: 126072 + 306 = 126378
Step 414: 126378 + 306 = 126684
Step 415: 126684 + 306 = 126990
Step 416: 126990 + 306 = 127296
Step 417: 127296 + 306 = 127602
Step 418: 127602 + 306 = 127908
Step 419: 127908 + 306 = 128214
Step 420: 128214 + 306 = 128520
Step 421: 128520 + 306 = 128826
Step 422: 128826 + 306 = 129132
Step 423: 129132 + 306 = 129438
Step 424: 129438 + 306 = 129744
Step 425: 129744 + 306 = 130050
Step 426: 130050 + 306 = 130356
Step 427: 130356 + 306 = 130662
Step 428: 130662 + 306 = 130968
Step 429: 130968 + 306 = 131274
Step 430: 131274 + 306 = 131580
Step 431: 131580 + 306 = 131886
Step 432: 131886 + 306 = 132192
Step 433: 132192 + 306 = 132498
Step 434: 132498 + 306 = 132804
Step 435: 132804 + 306 = 133110
Step 436: 133110 + 306 = 133416
Step 437: 133416 + 306 = 133722
Step 438: 133722 + 306 = 134028
Step 439: 134028 + 306 = 134334
Step 440: 134334 + 306 = 134640
Step 441: 134640 + 306 = 134946
Step 442: 134946 + 306 = 135252
Step 443: 135252 + 306 = 135558
Step 444: 135558 + 306 = 135864
Step 445: 135864 + 306 = 136170
Step 446: 136170 + 306 = 136476
Step 447: 136476 + 306 = 136782
Step 448: 136782 + 306 = 137088
Step 449: 137088 + 306 = 137394
Step 450: 137394 + 306 = 137700
Step 451: 137700 + 306 = 138006
Step 452: 138006 + 306 = 138312

So, 306*452 = 138312