OK, let's crack this. We're given 721 and our task is to multiply it by 141. Essentially, we'll be adding 721 to itself 141 times.
Step 1: 0 + 721 = 721
Step 2: 721 + 721 = 1442
Step 3: 1442 + 721 = 2163
Step 4: 2163 + 721 = 2884
Step 5: 2884 + 721 = 3605
Step 6: 3605 + 721 = 4326
Step 7: 4326 + 721 = 5047
Step 8: 5047 + 721 = 5768
Step 9: 5768 + 721 = 6489
Step 10: 6489 + 721 = 7210
Step 11: 7210 + 721 = 7931
Step 12: 7931 + 721 = 8652
Step 13: 8652 + 721 = 9373
Step 14: 9373 + 721 = 10094
Step 15: 10094 + 721 = 10815
Step 16: 10815 + 721 = 11536
Step 17: 11536 + 721 = 12257
Step 18: 12257 + 721 = 12978
Step 19: 12978 + 721 = 13699
Step 20: 13699 + 721 = 14420
Step 21: 14420 + 721 = 15141
Step 22: 15141 + 721 = 15862
Step 23: 15862 + 721 = 16583
Step 24: 16583 + 721 = 17304
Step 25: 17304 + 721 = 18025
Step 26: 18025 + 721 = 18746
Step 27: 18746 + 721 = 19467
Step 28: 19467 + 721 = 20188
Step 29: 20188 + 721 = 20909
Step 30: 20909 + 721 = 21630
Step 31: 21630 + 721 = 22351
Step 32: 22351 + 721 = 23072
Step 33: 23072 + 721 = 23793
Step 34: 23793 + 721 = 24514
Step 35: 24514 + 721 = 25235
Step 36: 25235 + 721 = 25956
Step 37: 25956 + 721 = 26677
Step 38: 26677 + 721 = 27398
Step 39: 27398 + 721 = 28119
Step 40: 28119 + 721 = 28840
Step 41: 28840 + 721 = 29561
Step 42: 29561 + 721 = 30282
Step 43: 30282 + 721 = 31003
Step 44: 31003 + 721 = 31724
Step 45: 31724 + 721 = 32445
Step 46: 32445 + 721 = 33166
Step 47: 33166 + 721 = 33887
Step 48: 33887 + 721 = 34608
Step 49: 34608 + 721 = 35329
Step 50: 35329 + 721 = 36050
Step 51: 36050 + 721 = 36771
Step 52: 36771 + 721 = 37492
Step 53: 37492 + 721 = 38213
Step 54: 38213 + 721 = 38934
Step 55: 38934 + 721 = 39655
Step 56: 39655 + 721 = 40376
Step 57: 40376 + 721 = 41097
Step 58: 41097 + 721 = 41818
Step 59: 41818 + 721 = 42539
Step 60: 42539 + 721 = 43260
Step 61: 43260 + 721 = 43981
Step 62: 43981 + 721 = 44702
Step 63: 44702 + 721 = 45423
Step 64: 45423 + 721 = 46144
Step 65: 46144 + 721 = 46865
Step 66: 46865 + 721 = 47586
Step 67: 47586 + 721 = 48307
Step 68: 48307 + 721 = 49028
Step 69: 49028 + 721 = 49749
Step 70: 49749 + 721 = 50470
Step 71: 50470 + 721 = 51191
Step 72: 51191 + 721 = 51912
Step 73: 51912 + 721 = 52633
Step 74: 52633 + 721 = 53354
Step 75: 53354 + 721 = 54075
Step 76: 54075 + 721 = 54796
Step 77: 54796 + 721 = 55517
Step 78: 55517 + 721 = 56238
Step 79: 56238 + 721 = 56959
Step 80: 56959 + 721 = 57680
Step 81: 57680 + 721 = 58401
Step 82: 58401 + 721 = 59122
Step 83: 59122 + 721 = 59843
Step 84: 59843 + 721 = 60564
Step 85: 60564 + 721 = 61285
Step 86: 61285 + 721 = 62006
Step 87: 62006 + 721 = 62727
Step 88: 62727 + 721 = 63448
Step 89: 63448 + 721 = 64169
Step 90: 64169 + 721 = 64890
Step 91: 64890 + 721 = 65611
Step 92: 65611 + 721 = 66332
Step 93: 66332 + 721 = 67053
Step 94: 67053 + 721 = 67774
Step 95: 67774 + 721 = 68495
Step 96: 68495 + 721 = 69216
Step 97: 69216 + 721 = 69937
Step 98: 69937 + 721 = 70658
Step 99: 70658 + 721 = 71379
Step 100: 71379 + 721 = 72100
Step 101: 72100 + 721 = 72821
Step 102: 72821 + 721 = 73542
Step 103: 73542 + 721 = 74263
Step 104: 74263 + 721 = 74984
Step 105: 74984 + 721 = 75705
Step 106: 75705 + 721 = 76426
Step 107: 76426 + 721 = 77147
Step 108: 77147 + 721 = 77868
Step 109: 77868 + 721 = 78589
Step 110: 78589 + 721 = 79310
Step 111: 79310 + 721 = 80031
Step 112: 80031 + 721 = 80752
Step 113: 80752 + 721 = 81473
Step 114: 81473 + 721 = 82194
Step 115: 82194 + 721 = 82915
Step 116: 82915 + 721 = 83636
Step 117: 83636 + 721 = 84357
Step 118: 84357 + 721 = 85078
Step 119: 85078 + 721 = 85799
Step 120: 85799 + 721 = 86520
Step 121: 86520 + 721 = 87241
Step 122: 87241 + 721 = 87962
Step 123: 87962 + 721 = 88683
Step 124: 88683 + 721 = 89404
Step 125: 89404 + 721 = 90125
Step 126: 90125 + 721 = 90846
Step 127: 90846 + 721 = 91567
Step 128: 91567 + 721 = 92288
Step 129: 92288 + 721 = 93009
Step 130: 93009 + 721 = 93730
Step 131: 93730 + 721 = 94451
Step 132: 94451 + 721 = 95172
Step 133: 95172 + 721 = 95893
Step 134: 95893 + 721 = 96614
Step 135: 96614 + 721 = 97335
Step 136: 97335 + 721 = 98056
Step 137: 98056 + 721 = 98777
Step 138: 98777 + 721 = 99498
Step 139: 99498 + 721 = 100219
Step 140: 100219 + 721 = 100940
Step 141: 100940 + 721 = 101661

So, 721*141 = 101661