Without delay, let's solve this. We've got 321 and we will be multiplying it by 137, that is, adding 321 to itself 137 times.
Step 1: 0 + 321 = 321
Step 2: 321 + 321 = 642
Step 3: 642 + 321 = 963
Step 4: 963 + 321 = 1284
Step 5: 1284 + 321 = 1605
Step 6: 1605 + 321 = 1926
Step 7: 1926 + 321 = 2247
Step 8: 2247 + 321 = 2568
Step 9: 2568 + 321 = 2889
Step 10: 2889 + 321 = 3210
Step 11: 3210 + 321 = 3531
Step 12: 3531 + 321 = 3852
Step 13: 3852 + 321 = 4173
Step 14: 4173 + 321 = 4494
Step 15: 4494 + 321 = 4815
Step 16: 4815 + 321 = 5136
Step 17: 5136 + 321 = 5457
Step 18: 5457 + 321 = 5778
Step 19: 5778 + 321 = 6099
Step 20: 6099 + 321 = 6420
Step 21: 6420 + 321 = 6741
Step 22: 6741 + 321 = 7062
Step 23: 7062 + 321 = 7383
Step 24: 7383 + 321 = 7704
Step 25: 7704 + 321 = 8025
Step 26: 8025 + 321 = 8346
Step 27: 8346 + 321 = 8667
Step 28: 8667 + 321 = 8988
Step 29: 8988 + 321 = 9309
Step 30: 9309 + 321 = 9630
Step 31: 9630 + 321 = 9951
Step 32: 9951 + 321 = 10272
Step 33: 10272 + 321 = 10593
Step 34: 10593 + 321 = 10914
Step 35: 10914 + 321 = 11235
Step 36: 11235 + 321 = 11556
Step 37: 11556 + 321 = 11877
Step 38: 11877 + 321 = 12198
Step 39: 12198 + 321 = 12519
Step 40: 12519 + 321 = 12840
Step 41: 12840 + 321 = 13161
Step 42: 13161 + 321 = 13482
Step 43: 13482 + 321 = 13803
Step 44: 13803 + 321 = 14124
Step 45: 14124 + 321 = 14445
Step 46: 14445 + 321 = 14766
Step 47: 14766 + 321 = 15087
Step 48: 15087 + 321 = 15408
Step 49: 15408 + 321 = 15729
Step 50: 15729 + 321 = 16050
Step 51: 16050 + 321 = 16371
Step 52: 16371 + 321 = 16692
Step 53: 16692 + 321 = 17013
Step 54: 17013 + 321 = 17334
Step 55: 17334 + 321 = 17655
Step 56: 17655 + 321 = 17976
Step 57: 17976 + 321 = 18297
Step 58: 18297 + 321 = 18618
Step 59: 18618 + 321 = 18939
Step 60: 18939 + 321 = 19260
Step 61: 19260 + 321 = 19581
Step 62: 19581 + 321 = 19902
Step 63: 19902 + 321 = 20223
Step 64: 20223 + 321 = 20544
Step 65: 20544 + 321 = 20865
Step 66: 20865 + 321 = 21186
Step 67: 21186 + 321 = 21507
Step 68: 21507 + 321 = 21828
Step 69: 21828 + 321 = 22149
Step 70: 22149 + 321 = 22470
Step 71: 22470 + 321 = 22791
Step 72: 22791 + 321 = 23112
Step 73: 23112 + 321 = 23433
Step 74: 23433 + 321 = 23754
Step 75: 23754 + 321 = 24075
Step 76: 24075 + 321 = 24396
Step 77: 24396 + 321 = 24717
Step 78: 24717 + 321 = 25038
Step 79: 25038 + 321 = 25359
Step 80: 25359 + 321 = 25680
Step 81: 25680 + 321 = 26001
Step 82: 26001 + 321 = 26322
Step 83: 26322 + 321 = 26643
Step 84: 26643 + 321 = 26964
Step 85: 26964 + 321 = 27285
Step 86: 27285 + 321 = 27606
Step 87: 27606 + 321 = 27927
Step 88: 27927 + 321 = 28248
Step 89: 28248 + 321 = 28569
Step 90: 28569 + 321 = 28890
Step 91: 28890 + 321 = 29211
Step 92: 29211 + 321 = 29532
Step 93: 29532 + 321 = 29853
Step 94: 29853 + 321 = 30174
Step 95: 30174 + 321 = 30495
Step 96: 30495 + 321 = 30816
Step 97: 30816 + 321 = 31137
Step 98: 31137 + 321 = 31458
Step 99: 31458 + 321 = 31779
Step 100: 31779 + 321 = 32100
Step 101: 32100 + 321 = 32421
Step 102: 32421 + 321 = 32742
Step 103: 32742 + 321 = 33063
Step 104: 33063 + 321 = 33384
Step 105: 33384 + 321 = 33705
Step 106: 33705 + 321 = 34026
Step 107: 34026 + 321 = 34347
Step 108: 34347 + 321 = 34668
Step 109: 34668 + 321 = 34989
Step 110: 34989 + 321 = 35310
Step 111: 35310 + 321 = 35631
Step 112: 35631 + 321 = 35952
Step 113: 35952 + 321 = 36273
Step 114: 36273 + 321 = 36594
Step 115: 36594 + 321 = 36915
Step 116: 36915 + 321 = 37236
Step 117: 37236 + 321 = 37557
Step 118: 37557 + 321 = 37878
Step 119: 37878 + 321 = 38199
Step 120: 38199 + 321 = 38520
Step 121: 38520 + 321 = 38841
Step 122: 38841 + 321 = 39162
Step 123: 39162 + 321 = 39483
Step 124: 39483 + 321 = 39804
Step 125: 39804 + 321 = 40125
Step 126: 40125 + 321 = 40446
Step 127: 40446 + 321 = 40767
Step 128: 40767 + 321 = 41088
Step 129: 41088 + 321 = 41409
Step 130: 41409 + 321 = 41730
Step 131: 41730 + 321 = 42051
Step 132: 42051 + 321 = 42372
Step 133: 42372 + 321 = 42693
Step 134: 42693 + 321 = 43014
Step 135: 43014 + 321 = 43335
Step 136: 43335 + 321 = 43656
Step 137: 43656 + 321 = 43977

So, 321*137 = 43977