Without delay, let's solve this. We've got 178 and we will be multiplying it by 121, that is, adding 178 to itself 121 times.
Step 1: 0 + 178 = 178
Step 2: 178 + 178 = 356
Step 3: 356 + 178 = 534
Step 4: 534 + 178 = 712
Step 5: 712 + 178 = 890
Step 6: 890 + 178 = 1068
Step 7: 1068 + 178 = 1246
Step 8: 1246 + 178 = 1424
Step 9: 1424 + 178 = 1602
Step 10: 1602 + 178 = 1780
Step 11: 1780 + 178 = 1958
Step 12: 1958 + 178 = 2136
Step 13: 2136 + 178 = 2314
Step 14: 2314 + 178 = 2492
Step 15: 2492 + 178 = 2670
Step 16: 2670 + 178 = 2848
Step 17: 2848 + 178 = 3026
Step 18: 3026 + 178 = 3204
Step 19: 3204 + 178 = 3382
Step 20: 3382 + 178 = 3560
Step 21: 3560 + 178 = 3738
Step 22: 3738 + 178 = 3916
Step 23: 3916 + 178 = 4094
Step 24: 4094 + 178 = 4272
Step 25: 4272 + 178 = 4450
Step 26: 4450 + 178 = 4628
Step 27: 4628 + 178 = 4806
Step 28: 4806 + 178 = 4984
Step 29: 4984 + 178 = 5162
Step 30: 5162 + 178 = 5340
Step 31: 5340 + 178 = 5518
Step 32: 5518 + 178 = 5696
Step 33: 5696 + 178 = 5874
Step 34: 5874 + 178 = 6052
Step 35: 6052 + 178 = 6230
Step 36: 6230 + 178 = 6408
Step 37: 6408 + 178 = 6586
Step 38: 6586 + 178 = 6764
Step 39: 6764 + 178 = 6942
Step 40: 6942 + 178 = 7120
Step 41: 7120 + 178 = 7298
Step 42: 7298 + 178 = 7476
Step 43: 7476 + 178 = 7654
Step 44: 7654 + 178 = 7832
Step 45: 7832 + 178 = 8010
Step 46: 8010 + 178 = 8188
Step 47: 8188 + 178 = 8366
Step 48: 8366 + 178 = 8544
Step 49: 8544 + 178 = 8722
Step 50: 8722 + 178 = 8900
Step 51: 8900 + 178 = 9078
Step 52: 9078 + 178 = 9256
Step 53: 9256 + 178 = 9434
Step 54: 9434 + 178 = 9612
Step 55: 9612 + 178 = 9790
Step 56: 9790 + 178 = 9968
Step 57: 9968 + 178 = 10146
Step 58: 10146 + 178 = 10324
Step 59: 10324 + 178 = 10502
Step 60: 10502 + 178 = 10680
Step 61: 10680 + 178 = 10858
Step 62: 10858 + 178 = 11036
Step 63: 11036 + 178 = 11214
Step 64: 11214 + 178 = 11392
Step 65: 11392 + 178 = 11570
Step 66: 11570 + 178 = 11748
Step 67: 11748 + 178 = 11926
Step 68: 11926 + 178 = 12104
Step 69: 12104 + 178 = 12282
Step 70: 12282 + 178 = 12460
Step 71: 12460 + 178 = 12638
Step 72: 12638 + 178 = 12816
Step 73: 12816 + 178 = 12994
Step 74: 12994 + 178 = 13172
Step 75: 13172 + 178 = 13350
Step 76: 13350 + 178 = 13528
Step 77: 13528 + 178 = 13706
Step 78: 13706 + 178 = 13884
Step 79: 13884 + 178 = 14062
Step 80: 14062 + 178 = 14240
Step 81: 14240 + 178 = 14418
Step 82: 14418 + 178 = 14596
Step 83: 14596 + 178 = 14774
Step 84: 14774 + 178 = 14952
Step 85: 14952 + 178 = 15130
Step 86: 15130 + 178 = 15308
Step 87: 15308 + 178 = 15486
Step 88: 15486 + 178 = 15664
Step 89: 15664 + 178 = 15842
Step 90: 15842 + 178 = 16020
Step 91: 16020 + 178 = 16198
Step 92: 16198 + 178 = 16376
Step 93: 16376 + 178 = 16554
Step 94: 16554 + 178 = 16732
Step 95: 16732 + 178 = 16910
Step 96: 16910 + 178 = 17088
Step 97: 17088 + 178 = 17266
Step 98: 17266 + 178 = 17444
Step 99: 17444 + 178 = 17622
Step 100: 17622 + 178 = 17800
Step 101: 17800 + 178 = 17978
Step 102: 17978 + 178 = 18156
Step 103: 18156 + 178 = 18334
Step 104: 18334 + 178 = 18512
Step 105: 18512 + 178 = 18690
Step 106: 18690 + 178 = 18868
Step 107: 18868 + 178 = 19046
Step 108: 19046 + 178 = 19224
Step 109: 19224 + 178 = 19402
Step 110: 19402 + 178 = 19580
Step 111: 19580 + 178 = 19758
Step 112: 19758 + 178 = 19936
Step 113: 19936 + 178 = 20114
Step 114: 20114 + 178 = 20292
Step 115: 20292 + 178 = 20470
Step 116: 20470 + 178 = 20648
Step 117: 20648 + 178 = 20826
Step 118: 20826 + 178 = 21004
Step 119: 21004 + 178 = 21182
Step 120: 21182 + 178 = 21360
Step 121: 21360 + 178 = 21538

So, 178*121 = 21538