Without delay, let's solve this. We've got 866 and we will be multiplying it by 144, that is, adding 866 to itself 144 times.
Step 1: 0 + 866 = 866
Step 2: 866 + 866 = 1732
Step 3: 1732 + 866 = 2598
Step 4: 2598 + 866 = 3464
Step 5: 3464 + 866 = 4330
Step 6: 4330 + 866 = 5196
Step 7: 5196 + 866 = 6062
Step 8: 6062 + 866 = 6928
Step 9: 6928 + 866 = 7794
Step 10: 7794 + 866 = 8660
Step 11: 8660 + 866 = 9526
Step 12: 9526 + 866 = 10392
Step 13: 10392 + 866 = 11258
Step 14: 11258 + 866 = 12124
Step 15: 12124 + 866 = 12990
Step 16: 12990 + 866 = 13856
Step 17: 13856 + 866 = 14722
Step 18: 14722 + 866 = 15588
Step 19: 15588 + 866 = 16454
Step 20: 16454 + 866 = 17320
Step 21: 17320 + 866 = 18186
Step 22: 18186 + 866 = 19052
Step 23: 19052 + 866 = 19918
Step 24: 19918 + 866 = 20784
Step 25: 20784 + 866 = 21650
Step 26: 21650 + 866 = 22516
Step 27: 22516 + 866 = 23382
Step 28: 23382 + 866 = 24248
Step 29: 24248 + 866 = 25114
Step 30: 25114 + 866 = 25980
Step 31: 25980 + 866 = 26846
Step 32: 26846 + 866 = 27712
Step 33: 27712 + 866 = 28578
Step 34: 28578 + 866 = 29444
Step 35: 29444 + 866 = 30310
Step 36: 30310 + 866 = 31176
Step 37: 31176 + 866 = 32042
Step 38: 32042 + 866 = 32908
Step 39: 32908 + 866 = 33774
Step 40: 33774 + 866 = 34640
Step 41: 34640 + 866 = 35506
Step 42: 35506 + 866 = 36372
Step 43: 36372 + 866 = 37238
Step 44: 37238 + 866 = 38104
Step 45: 38104 + 866 = 38970
Step 46: 38970 + 866 = 39836
Step 47: 39836 + 866 = 40702
Step 48: 40702 + 866 = 41568
Step 49: 41568 + 866 = 42434
Step 50: 42434 + 866 = 43300
Step 51: 43300 + 866 = 44166
Step 52: 44166 + 866 = 45032
Step 53: 45032 + 866 = 45898
Step 54: 45898 + 866 = 46764
Step 55: 46764 + 866 = 47630
Step 56: 47630 + 866 = 48496
Step 57: 48496 + 866 = 49362
Step 58: 49362 + 866 = 50228
Step 59: 50228 + 866 = 51094
Step 60: 51094 + 866 = 51960
Step 61: 51960 + 866 = 52826
Step 62: 52826 + 866 = 53692
Step 63: 53692 + 866 = 54558
Step 64: 54558 + 866 = 55424
Step 65: 55424 + 866 = 56290
Step 66: 56290 + 866 = 57156
Step 67: 57156 + 866 = 58022
Step 68: 58022 + 866 = 58888
Step 69: 58888 + 866 = 59754
Step 70: 59754 + 866 = 60620
Step 71: 60620 + 866 = 61486
Step 72: 61486 + 866 = 62352
Step 73: 62352 + 866 = 63218
Step 74: 63218 + 866 = 64084
Step 75: 64084 + 866 = 64950
Step 76: 64950 + 866 = 65816
Step 77: 65816 + 866 = 66682
Step 78: 66682 + 866 = 67548
Step 79: 67548 + 866 = 68414
Step 80: 68414 + 866 = 69280
Step 81: 69280 + 866 = 70146
Step 82: 70146 + 866 = 71012
Step 83: 71012 + 866 = 71878
Step 84: 71878 + 866 = 72744
Step 85: 72744 + 866 = 73610
Step 86: 73610 + 866 = 74476
Step 87: 74476 + 866 = 75342
Step 88: 75342 + 866 = 76208
Step 89: 76208 + 866 = 77074
Step 90: 77074 + 866 = 77940
Step 91: 77940 + 866 = 78806
Step 92: 78806 + 866 = 79672
Step 93: 79672 + 866 = 80538
Step 94: 80538 + 866 = 81404
Step 95: 81404 + 866 = 82270
Step 96: 82270 + 866 = 83136
Step 97: 83136 + 866 = 84002
Step 98: 84002 + 866 = 84868
Step 99: 84868 + 866 = 85734
Step 100: 85734 + 866 = 86600
Step 101: 86600 + 866 = 87466
Step 102: 87466 + 866 = 88332
Step 103: 88332 + 866 = 89198
Step 104: 89198 + 866 = 90064
Step 105: 90064 + 866 = 90930
Step 106: 90930 + 866 = 91796
Step 107: 91796 + 866 = 92662
Step 108: 92662 + 866 = 93528
Step 109: 93528 + 866 = 94394
Step 110: 94394 + 866 = 95260
Step 111: 95260 + 866 = 96126
Step 112: 96126 + 866 = 96992
Step 113: 96992 + 866 = 97858
Step 114: 97858 + 866 = 98724
Step 115: 98724 + 866 = 99590
Step 116: 99590 + 866 = 100456
Step 117: 100456 + 866 = 101322
Step 118: 101322 + 866 = 102188
Step 119: 102188 + 866 = 103054
Step 120: 103054 + 866 = 103920
Step 121: 103920 + 866 = 104786
Step 122: 104786 + 866 = 105652
Step 123: 105652 + 866 = 106518
Step 124: 106518 + 866 = 107384
Step 125: 107384 + 866 = 108250
Step 126: 108250 + 866 = 109116
Step 127: 109116 + 866 = 109982
Step 128: 109982 + 866 = 110848
Step 129: 110848 + 866 = 111714
Step 130: 111714 + 866 = 112580
Step 131: 112580 + 866 = 113446
Step 132: 113446 + 866 = 114312
Step 133: 114312 + 866 = 115178
Step 134: 115178 + 866 = 116044
Step 135: 116044 + 866 = 116910
Step 136: 116910 + 866 = 117776
Step 137: 117776 + 866 = 118642
Step 138: 118642 + 866 = 119508
Step 139: 119508 + 866 = 120374
Step 140: 120374 + 866 = 121240
Step 141: 121240 + 866 = 122106
Step 142: 122106 + 866 = 122972
Step 143: 122972 + 866 = 123838
Step 144: 123838 + 866 = 124704

So, 866*144 = 124704