Let's get this math done. We have 821 and we're going to multiply it by 139. This is the same as taking 821 and adding it to itself 139 times.
Step 1: 0 + 821 = 821
Step 2: 821 + 821 = 1642
Step 3: 1642 + 821 = 2463
Step 4: 2463 + 821 = 3284
Step 5: 3284 + 821 = 4105
Step 6: 4105 + 821 = 4926
Step 7: 4926 + 821 = 5747
Step 8: 5747 + 821 = 6568
Step 9: 6568 + 821 = 7389
Step 10: 7389 + 821 = 8210
Step 11: 8210 + 821 = 9031
Step 12: 9031 + 821 = 9852
Step 13: 9852 + 821 = 10673
Step 14: 10673 + 821 = 11494
Step 15: 11494 + 821 = 12315
Step 16: 12315 + 821 = 13136
Step 17: 13136 + 821 = 13957
Step 18: 13957 + 821 = 14778
Step 19: 14778 + 821 = 15599
Step 20: 15599 + 821 = 16420
Step 21: 16420 + 821 = 17241
Step 22: 17241 + 821 = 18062
Step 23: 18062 + 821 = 18883
Step 24: 18883 + 821 = 19704
Step 25: 19704 + 821 = 20525
Step 26: 20525 + 821 = 21346
Step 27: 21346 + 821 = 22167
Step 28: 22167 + 821 = 22988
Step 29: 22988 + 821 = 23809
Step 30: 23809 + 821 = 24630
Step 31: 24630 + 821 = 25451
Step 32: 25451 + 821 = 26272
Step 33: 26272 + 821 = 27093
Step 34: 27093 + 821 = 27914
Step 35: 27914 + 821 = 28735
Step 36: 28735 + 821 = 29556
Step 37: 29556 + 821 = 30377
Step 38: 30377 + 821 = 31198
Step 39: 31198 + 821 = 32019
Step 40: 32019 + 821 = 32840
Step 41: 32840 + 821 = 33661
Step 42: 33661 + 821 = 34482
Step 43: 34482 + 821 = 35303
Step 44: 35303 + 821 = 36124
Step 45: 36124 + 821 = 36945
Step 46: 36945 + 821 = 37766
Step 47: 37766 + 821 = 38587
Step 48: 38587 + 821 = 39408
Step 49: 39408 + 821 = 40229
Step 50: 40229 + 821 = 41050
Step 51: 41050 + 821 = 41871
Step 52: 41871 + 821 = 42692
Step 53: 42692 + 821 = 43513
Step 54: 43513 + 821 = 44334
Step 55: 44334 + 821 = 45155
Step 56: 45155 + 821 = 45976
Step 57: 45976 + 821 = 46797
Step 58: 46797 + 821 = 47618
Step 59: 47618 + 821 = 48439
Step 60: 48439 + 821 = 49260
Step 61: 49260 + 821 = 50081
Step 62: 50081 + 821 = 50902
Step 63: 50902 + 821 = 51723
Step 64: 51723 + 821 = 52544
Step 65: 52544 + 821 = 53365
Step 66: 53365 + 821 = 54186
Step 67: 54186 + 821 = 55007
Step 68: 55007 + 821 = 55828
Step 69: 55828 + 821 = 56649
Step 70: 56649 + 821 = 57470
Step 71: 57470 + 821 = 58291
Step 72: 58291 + 821 = 59112
Step 73: 59112 + 821 = 59933
Step 74: 59933 + 821 = 60754
Step 75: 60754 + 821 = 61575
Step 76: 61575 + 821 = 62396
Step 77: 62396 + 821 = 63217
Step 78: 63217 + 821 = 64038
Step 79: 64038 + 821 = 64859
Step 80: 64859 + 821 = 65680
Step 81: 65680 + 821 = 66501
Step 82: 66501 + 821 = 67322
Step 83: 67322 + 821 = 68143
Step 84: 68143 + 821 = 68964
Step 85: 68964 + 821 = 69785
Step 86: 69785 + 821 = 70606
Step 87: 70606 + 821 = 71427
Step 88: 71427 + 821 = 72248
Step 89: 72248 + 821 = 73069
Step 90: 73069 + 821 = 73890
Step 91: 73890 + 821 = 74711
Step 92: 74711 + 821 = 75532
Step 93: 75532 + 821 = 76353
Step 94: 76353 + 821 = 77174
Step 95: 77174 + 821 = 77995
Step 96: 77995 + 821 = 78816
Step 97: 78816 + 821 = 79637
Step 98: 79637 + 821 = 80458
Step 99: 80458 + 821 = 81279
Step 100: 81279 + 821 = 82100
Step 101: 82100 + 821 = 82921
Step 102: 82921 + 821 = 83742
Step 103: 83742 + 821 = 84563
Step 104: 84563 + 821 = 85384
Step 105: 85384 + 821 = 86205
Step 106: 86205 + 821 = 87026
Step 107: 87026 + 821 = 87847
Step 108: 87847 + 821 = 88668
Step 109: 88668 + 821 = 89489
Step 110: 89489 + 821 = 90310
Step 111: 90310 + 821 = 91131
Step 112: 91131 + 821 = 91952
Step 113: 91952 + 821 = 92773
Step 114: 92773 + 821 = 93594
Step 115: 93594 + 821 = 94415
Step 116: 94415 + 821 = 95236
Step 117: 95236 + 821 = 96057
Step 118: 96057 + 821 = 96878
Step 119: 96878 + 821 = 97699
Step 120: 97699 + 821 = 98520
Step 121: 98520 + 821 = 99341
Step 122: 99341 + 821 = 100162
Step 123: 100162 + 821 = 100983
Step 124: 100983 + 821 = 101804
Step 125: 101804 + 821 = 102625
Step 126: 102625 + 821 = 103446
Step 127: 103446 + 821 = 104267
Step 128: 104267 + 821 = 105088
Step 129: 105088 + 821 = 105909
Step 130: 105909 + 821 = 106730
Step 131: 106730 + 821 = 107551
Step 132: 107551 + 821 = 108372
Step 133: 108372 + 821 = 109193
Step 134: 109193 + 821 = 110014
Step 135: 110014 + 821 = 110835
Step 136: 110835 + 821 = 111656
Step 137: 111656 + 821 = 112477
Step 138: 112477 + 821 = 113298
Step 139: 113298 + 821 = 114119

So, 821*139 = 114119