OK, let's crack this. We're given 49 and our task is to multiply it by 126. Essentially, we'll be adding 49 to itself 126 times.
Step 1: 0 + 49 = 49
Step 2: 49 + 49 = 98
Step 3: 98 + 49 = 147
Step 4: 147 + 49 = 196
Step 5: 196 + 49 = 245
Step 6: 245 + 49 = 294
Step 7: 294 + 49 = 343
Step 8: 343 + 49 = 392
Step 9: 392 + 49 = 441
Step 10: 441 + 49 = 490
Step 11: 490 + 49 = 539
Step 12: 539 + 49 = 588
Step 13: 588 + 49 = 637
Step 14: 637 + 49 = 686
Step 15: 686 + 49 = 735
Step 16: 735 + 49 = 784
Step 17: 784 + 49 = 833
Step 18: 833 + 49 = 882
Step 19: 882 + 49 = 931
Step 20: 931 + 49 = 980
Step 21: 980 + 49 = 1029
Step 22: 1029 + 49 = 1078
Step 23: 1078 + 49 = 1127
Step 24: 1127 + 49 = 1176
Step 25: 1176 + 49 = 1225
Step 26: 1225 + 49 = 1274
Step 27: 1274 + 49 = 1323
Step 28: 1323 + 49 = 1372
Step 29: 1372 + 49 = 1421
Step 30: 1421 + 49 = 1470
Step 31: 1470 + 49 = 1519
Step 32: 1519 + 49 = 1568
Step 33: 1568 + 49 = 1617
Step 34: 1617 + 49 = 1666
Step 35: 1666 + 49 = 1715
Step 36: 1715 + 49 = 1764
Step 37: 1764 + 49 = 1813
Step 38: 1813 + 49 = 1862
Step 39: 1862 + 49 = 1911
Step 40: 1911 + 49 = 1960
Step 41: 1960 + 49 = 2009
Step 42: 2009 + 49 = 2058
Step 43: 2058 + 49 = 2107
Step 44: 2107 + 49 = 2156
Step 45: 2156 + 49 = 2205
Step 46: 2205 + 49 = 2254
Step 47: 2254 + 49 = 2303
Step 48: 2303 + 49 = 2352
Step 49: 2352 + 49 = 2401
Step 50: 2401 + 49 = 2450
Step 51: 2450 + 49 = 2499
Step 52: 2499 + 49 = 2548
Step 53: 2548 + 49 = 2597
Step 54: 2597 + 49 = 2646
Step 55: 2646 + 49 = 2695
Step 56: 2695 + 49 = 2744
Step 57: 2744 + 49 = 2793
Step 58: 2793 + 49 = 2842
Step 59: 2842 + 49 = 2891
Step 60: 2891 + 49 = 2940
Step 61: 2940 + 49 = 2989
Step 62: 2989 + 49 = 3038
Step 63: 3038 + 49 = 3087
Step 64: 3087 + 49 = 3136
Step 65: 3136 + 49 = 3185
Step 66: 3185 + 49 = 3234
Step 67: 3234 + 49 = 3283
Step 68: 3283 + 49 = 3332
Step 69: 3332 + 49 = 3381
Step 70: 3381 + 49 = 3430
Step 71: 3430 + 49 = 3479
Step 72: 3479 + 49 = 3528
Step 73: 3528 + 49 = 3577
Step 74: 3577 + 49 = 3626
Step 75: 3626 + 49 = 3675
Step 76: 3675 + 49 = 3724
Step 77: 3724 + 49 = 3773
Step 78: 3773 + 49 = 3822
Step 79: 3822 + 49 = 3871
Step 80: 3871 + 49 = 3920
Step 81: 3920 + 49 = 3969
Step 82: 3969 + 49 = 4018
Step 83: 4018 + 49 = 4067
Step 84: 4067 + 49 = 4116
Step 85: 4116 + 49 = 4165
Step 86: 4165 + 49 = 4214
Step 87: 4214 + 49 = 4263
Step 88: 4263 + 49 = 4312
Step 89: 4312 + 49 = 4361
Step 90: 4361 + 49 = 4410
Step 91: 4410 + 49 = 4459
Step 92: 4459 + 49 = 4508
Step 93: 4508 + 49 = 4557
Step 94: 4557 + 49 = 4606
Step 95: 4606 + 49 = 4655
Step 96: 4655 + 49 = 4704
Step 97: 4704 + 49 = 4753
Step 98: 4753 + 49 = 4802
Step 99: 4802 + 49 = 4851
Step 100: 4851 + 49 = 4900
Step 101: 4900 + 49 = 4949
Step 102: 4949 + 49 = 4998
Step 103: 4998 + 49 = 5047
Step 104: 5047 + 49 = 5096
Step 105: 5096 + 49 = 5145
Step 106: 5145 + 49 = 5194
Step 107: 5194 + 49 = 5243
Step 108: 5243 + 49 = 5292
Step 109: 5292 + 49 = 5341
Step 110: 5341 + 49 = 5390
Step 111: 5390 + 49 = 5439
Step 112: 5439 + 49 = 5488
Step 113: 5488 + 49 = 5537
Step 114: 5537 + 49 = 5586
Step 115: 5586 + 49 = 5635
Step 116: 5635 + 49 = 5684
Step 117: 5684 + 49 = 5733
Step 118: 5733 + 49 = 5782
Step 119: 5782 + 49 = 5831
Step 120: 5831 + 49 = 5880
Step 121: 5880 + 49 = 5929
Step 122: 5929 + 49 = 5978
Step 123: 5978 + 49 = 6027
Step 124: 6027 + 49 = 6076
Step 125: 6076 + 49 = 6125
Step 126: 6125 + 49 = 6174

So, 49*126 = 6174