Let's roll up our sleeves and solve this. We have 554 and we're going to multiply it by 121, essentially adding 554 to itself 121 times.
Step 1: 0 + 554 = 554
Step 2: 554 + 554 = 1108
Step 3: 1108 + 554 = 1662
Step 4: 1662 + 554 = 2216
Step 5: 2216 + 554 = 2770
Step 6: 2770 + 554 = 3324
Step 7: 3324 + 554 = 3878
Step 8: 3878 + 554 = 4432
Step 9: 4432 + 554 = 4986
Step 10: 4986 + 554 = 5540
Step 11: 5540 + 554 = 6094
Step 12: 6094 + 554 = 6648
Step 13: 6648 + 554 = 7202
Step 14: 7202 + 554 = 7756
Step 15: 7756 + 554 = 8310
Step 16: 8310 + 554 = 8864
Step 17: 8864 + 554 = 9418
Step 18: 9418 + 554 = 9972
Step 19: 9972 + 554 = 10526
Step 20: 10526 + 554 = 11080
Step 21: 11080 + 554 = 11634
Step 22: 11634 + 554 = 12188
Step 23: 12188 + 554 = 12742
Step 24: 12742 + 554 = 13296
Step 25: 13296 + 554 = 13850
Step 26: 13850 + 554 = 14404
Step 27: 14404 + 554 = 14958
Step 28: 14958 + 554 = 15512
Step 29: 15512 + 554 = 16066
Step 30: 16066 + 554 = 16620
Step 31: 16620 + 554 = 17174
Step 32: 17174 + 554 = 17728
Step 33: 17728 + 554 = 18282
Step 34: 18282 + 554 = 18836
Step 35: 18836 + 554 = 19390
Step 36: 19390 + 554 = 19944
Step 37: 19944 + 554 = 20498
Step 38: 20498 + 554 = 21052
Step 39: 21052 + 554 = 21606
Step 40: 21606 + 554 = 22160
Step 41: 22160 + 554 = 22714
Step 42: 22714 + 554 = 23268
Step 43: 23268 + 554 = 23822
Step 44: 23822 + 554 = 24376
Step 45: 24376 + 554 = 24930
Step 46: 24930 + 554 = 25484
Step 47: 25484 + 554 = 26038
Step 48: 26038 + 554 = 26592
Step 49: 26592 + 554 = 27146
Step 50: 27146 + 554 = 27700
Step 51: 27700 + 554 = 28254
Step 52: 28254 + 554 = 28808
Step 53: 28808 + 554 = 29362
Step 54: 29362 + 554 = 29916
Step 55: 29916 + 554 = 30470
Step 56: 30470 + 554 = 31024
Step 57: 31024 + 554 = 31578
Step 58: 31578 + 554 = 32132
Step 59: 32132 + 554 = 32686
Step 60: 32686 + 554 = 33240
Step 61: 33240 + 554 = 33794
Step 62: 33794 + 554 = 34348
Step 63: 34348 + 554 = 34902
Step 64: 34902 + 554 = 35456
Step 65: 35456 + 554 = 36010
Step 66: 36010 + 554 = 36564
Step 67: 36564 + 554 = 37118
Step 68: 37118 + 554 = 37672
Step 69: 37672 + 554 = 38226
Step 70: 38226 + 554 = 38780
Step 71: 38780 + 554 = 39334
Step 72: 39334 + 554 = 39888
Step 73: 39888 + 554 = 40442
Step 74: 40442 + 554 = 40996
Step 75: 40996 + 554 = 41550
Step 76: 41550 + 554 = 42104
Step 77: 42104 + 554 = 42658
Step 78: 42658 + 554 = 43212
Step 79: 43212 + 554 = 43766
Step 80: 43766 + 554 = 44320
Step 81: 44320 + 554 = 44874
Step 82: 44874 + 554 = 45428
Step 83: 45428 + 554 = 45982
Step 84: 45982 + 554 = 46536
Step 85: 46536 + 554 = 47090
Step 86: 47090 + 554 = 47644
Step 87: 47644 + 554 = 48198
Step 88: 48198 + 554 = 48752
Step 89: 48752 + 554 = 49306
Step 90: 49306 + 554 = 49860
Step 91: 49860 + 554 = 50414
Step 92: 50414 + 554 = 50968
Step 93: 50968 + 554 = 51522
Step 94: 51522 + 554 = 52076
Step 95: 52076 + 554 = 52630
Step 96: 52630 + 554 = 53184
Step 97: 53184 + 554 = 53738
Step 98: 53738 + 554 = 54292
Step 99: 54292 + 554 = 54846
Step 100: 54846 + 554 = 55400
Step 101: 55400 + 554 = 55954
Step 102: 55954 + 554 = 56508
Step 103: 56508 + 554 = 57062
Step 104: 57062 + 554 = 57616
Step 105: 57616 + 554 = 58170
Step 106: 58170 + 554 = 58724
Step 107: 58724 + 554 = 59278
Step 108: 59278 + 554 = 59832
Step 109: 59832 + 554 = 60386
Step 110: 60386 + 554 = 60940
Step 111: 60940 + 554 = 61494
Step 112: 61494 + 554 = 62048
Step 113: 62048 + 554 = 62602
Step 114: 62602 + 554 = 63156
Step 115: 63156 + 554 = 63710
Step 116: 63710 + 554 = 64264
Step 117: 64264 + 554 = 64818
Step 118: 64818 + 554 = 65372
Step 119: 65372 + 554 = 65926
Step 120: 65926 + 554 = 66480
Step 121: 66480 + 554 = 67034

So, 554*121 = 67034