Let's roll up our sleeves and solve this. We have 421 and we're going to multiply it by 190, essentially adding 421 to itself 190 times.
Step 1: 0 + 421 = 421
Step 2: 421 + 421 = 842
Step 3: 842 + 421 = 1263
Step 4: 1263 + 421 = 1684
Step 5: 1684 + 421 = 2105
Step 6: 2105 + 421 = 2526
Step 7: 2526 + 421 = 2947
Step 8: 2947 + 421 = 3368
Step 9: 3368 + 421 = 3789
Step 10: 3789 + 421 = 4210
Step 11: 4210 + 421 = 4631
Step 12: 4631 + 421 = 5052
Step 13: 5052 + 421 = 5473
Step 14: 5473 + 421 = 5894
Step 15: 5894 + 421 = 6315
Step 16: 6315 + 421 = 6736
Step 17: 6736 + 421 = 7157
Step 18: 7157 + 421 = 7578
Step 19: 7578 + 421 = 7999
Step 20: 7999 + 421 = 8420
Step 21: 8420 + 421 = 8841
Step 22: 8841 + 421 = 9262
Step 23: 9262 + 421 = 9683
Step 24: 9683 + 421 = 10104
Step 25: 10104 + 421 = 10525
Step 26: 10525 + 421 = 10946
Step 27: 10946 + 421 = 11367
Step 28: 11367 + 421 = 11788
Step 29: 11788 + 421 = 12209
Step 30: 12209 + 421 = 12630
Step 31: 12630 + 421 = 13051
Step 32: 13051 + 421 = 13472
Step 33: 13472 + 421 = 13893
Step 34: 13893 + 421 = 14314
Step 35: 14314 + 421 = 14735
Step 36: 14735 + 421 = 15156
Step 37: 15156 + 421 = 15577
Step 38: 15577 + 421 = 15998
Step 39: 15998 + 421 = 16419
Step 40: 16419 + 421 = 16840
Step 41: 16840 + 421 = 17261
Step 42: 17261 + 421 = 17682
Step 43: 17682 + 421 = 18103
Step 44: 18103 + 421 = 18524
Step 45: 18524 + 421 = 18945
Step 46: 18945 + 421 = 19366
Step 47: 19366 + 421 = 19787
Step 48: 19787 + 421 = 20208
Step 49: 20208 + 421 = 20629
Step 50: 20629 + 421 = 21050
Step 51: 21050 + 421 = 21471
Step 52: 21471 + 421 = 21892
Step 53: 21892 + 421 = 22313
Step 54: 22313 + 421 = 22734
Step 55: 22734 + 421 = 23155
Step 56: 23155 + 421 = 23576
Step 57: 23576 + 421 = 23997
Step 58: 23997 + 421 = 24418
Step 59: 24418 + 421 = 24839
Step 60: 24839 + 421 = 25260
Step 61: 25260 + 421 = 25681
Step 62: 25681 + 421 = 26102
Step 63: 26102 + 421 = 26523
Step 64: 26523 + 421 = 26944
Step 65: 26944 + 421 = 27365
Step 66: 27365 + 421 = 27786
Step 67: 27786 + 421 = 28207
Step 68: 28207 + 421 = 28628
Step 69: 28628 + 421 = 29049
Step 70: 29049 + 421 = 29470
Step 71: 29470 + 421 = 29891
Step 72: 29891 + 421 = 30312
Step 73: 30312 + 421 = 30733
Step 74: 30733 + 421 = 31154
Step 75: 31154 + 421 = 31575
Step 76: 31575 + 421 = 31996
Step 77: 31996 + 421 = 32417
Step 78: 32417 + 421 = 32838
Step 79: 32838 + 421 = 33259
Step 80: 33259 + 421 = 33680
Step 81: 33680 + 421 = 34101
Step 82: 34101 + 421 = 34522
Step 83: 34522 + 421 = 34943
Step 84: 34943 + 421 = 35364
Step 85: 35364 + 421 = 35785
Step 86: 35785 + 421 = 36206
Step 87: 36206 + 421 = 36627
Step 88: 36627 + 421 = 37048
Step 89: 37048 + 421 = 37469
Step 90: 37469 + 421 = 37890
Step 91: 37890 + 421 = 38311
Step 92: 38311 + 421 = 38732
Step 93: 38732 + 421 = 39153
Step 94: 39153 + 421 = 39574
Step 95: 39574 + 421 = 39995
Step 96: 39995 + 421 = 40416
Step 97: 40416 + 421 = 40837
Step 98: 40837 + 421 = 41258
Step 99: 41258 + 421 = 41679
Step 100: 41679 + 421 = 42100
Step 101: 42100 + 421 = 42521
Step 102: 42521 + 421 = 42942
Step 103: 42942 + 421 = 43363
Step 104: 43363 + 421 = 43784
Step 105: 43784 + 421 = 44205
Step 106: 44205 + 421 = 44626
Step 107: 44626 + 421 = 45047
Step 108: 45047 + 421 = 45468
Step 109: 45468 + 421 = 45889
Step 110: 45889 + 421 = 46310
Step 111: 46310 + 421 = 46731
Step 112: 46731 + 421 = 47152
Step 113: 47152 + 421 = 47573
Step 114: 47573 + 421 = 47994
Step 115: 47994 + 421 = 48415
Step 116: 48415 + 421 = 48836
Step 117: 48836 + 421 = 49257
Step 118: 49257 + 421 = 49678
Step 119: 49678 + 421 = 50099
Step 120: 50099 + 421 = 50520
Step 121: 50520 + 421 = 50941
Step 122: 50941 + 421 = 51362
Step 123: 51362 + 421 = 51783
Step 124: 51783 + 421 = 52204
Step 125: 52204 + 421 = 52625
Step 126: 52625 + 421 = 53046
Step 127: 53046 + 421 = 53467
Step 128: 53467 + 421 = 53888
Step 129: 53888 + 421 = 54309
Step 130: 54309 + 421 = 54730
Step 131: 54730 + 421 = 55151
Step 132: 55151 + 421 = 55572
Step 133: 55572 + 421 = 55993
Step 134: 55993 + 421 = 56414
Step 135: 56414 + 421 = 56835
Step 136: 56835 + 421 = 57256
Step 137: 57256 + 421 = 57677
Step 138: 57677 + 421 = 58098
Step 139: 58098 + 421 = 58519
Step 140: 58519 + 421 = 58940
Step 141: 58940 + 421 = 59361
Step 142: 59361 + 421 = 59782
Step 143: 59782 + 421 = 60203
Step 144: 60203 + 421 = 60624
Step 145: 60624 + 421 = 61045
Step 146: 61045 + 421 = 61466
Step 147: 61466 + 421 = 61887
Step 148: 61887 + 421 = 62308
Step 149: 62308 + 421 = 62729
Step 150: 62729 + 421 = 63150
Step 151: 63150 + 421 = 63571
Step 152: 63571 + 421 = 63992
Step 153: 63992 + 421 = 64413
Step 154: 64413 + 421 = 64834
Step 155: 64834 + 421 = 65255
Step 156: 65255 + 421 = 65676
Step 157: 65676 + 421 = 66097
Step 158: 66097 + 421 = 66518
Step 159: 66518 + 421 = 66939
Step 160: 66939 + 421 = 67360
Step 161: 67360 + 421 = 67781
Step 162: 67781 + 421 = 68202
Step 163: 68202 + 421 = 68623
Step 164: 68623 + 421 = 69044
Step 165: 69044 + 421 = 69465
Step 166: 69465 + 421 = 69886
Step 167: 69886 + 421 = 70307
Step 168: 70307 + 421 = 70728
Step 169: 70728 + 421 = 71149
Step 170: 71149 + 421 = 71570
Step 171: 71570 + 421 = 71991
Step 172: 71991 + 421 = 72412
Step 173: 72412 + 421 = 72833
Step 174: 72833 + 421 = 73254
Step 175: 73254 + 421 = 73675
Step 176: 73675 + 421 = 74096
Step 177: 74096 + 421 = 74517
Step 178: 74517 + 421 = 74938
Step 179: 74938 + 421 = 75359
Step 180: 75359 + 421 = 75780
Step 181: 75780 + 421 = 76201
Step 182: 76201 + 421 = 76622
Step 183: 76622 + 421 = 77043
Step 184: 77043 + 421 = 77464
Step 185: 77464 + 421 = 77885
Step 186: 77885 + 421 = 78306
Step 187: 78306 + 421 = 78727
Step 188: 78727 + 421 = 79148
Step 189: 79148 + 421 = 79569
Step 190: 79569 + 421 = 79990

So, 421*190 = 79990