Let's roll up our sleeves and solve this. We have 917 and we're going to multiply it by 123, essentially adding 917 to itself 123 times.
Step 1: 0 + 917 = 917
Step 2: 917 + 917 = 1834
Step 3: 1834 + 917 = 2751
Step 4: 2751 + 917 = 3668
Step 5: 3668 + 917 = 4585
Step 6: 4585 + 917 = 5502
Step 7: 5502 + 917 = 6419
Step 8: 6419 + 917 = 7336
Step 9: 7336 + 917 = 8253
Step 10: 8253 + 917 = 9170
Step 11: 9170 + 917 = 10087
Step 12: 10087 + 917 = 11004
Step 13: 11004 + 917 = 11921
Step 14: 11921 + 917 = 12838
Step 15: 12838 + 917 = 13755
Step 16: 13755 + 917 = 14672
Step 17: 14672 + 917 = 15589
Step 18: 15589 + 917 = 16506
Step 19: 16506 + 917 = 17423
Step 20: 17423 + 917 = 18340
Step 21: 18340 + 917 = 19257
Step 22: 19257 + 917 = 20174
Step 23: 20174 + 917 = 21091
Step 24: 21091 + 917 = 22008
Step 25: 22008 + 917 = 22925
Step 26: 22925 + 917 = 23842
Step 27: 23842 + 917 = 24759
Step 28: 24759 + 917 = 25676
Step 29: 25676 + 917 = 26593
Step 30: 26593 + 917 = 27510
Step 31: 27510 + 917 = 28427
Step 32: 28427 + 917 = 29344
Step 33: 29344 + 917 = 30261
Step 34: 30261 + 917 = 31178
Step 35: 31178 + 917 = 32095
Step 36: 32095 + 917 = 33012
Step 37: 33012 + 917 = 33929
Step 38: 33929 + 917 = 34846
Step 39: 34846 + 917 = 35763
Step 40: 35763 + 917 = 36680
Step 41: 36680 + 917 = 37597
Step 42: 37597 + 917 = 38514
Step 43: 38514 + 917 = 39431
Step 44: 39431 + 917 = 40348
Step 45: 40348 + 917 = 41265
Step 46: 41265 + 917 = 42182
Step 47: 42182 + 917 = 43099
Step 48: 43099 + 917 = 44016
Step 49: 44016 + 917 = 44933
Step 50: 44933 + 917 = 45850
Step 51: 45850 + 917 = 46767
Step 52: 46767 + 917 = 47684
Step 53: 47684 + 917 = 48601
Step 54: 48601 + 917 = 49518
Step 55: 49518 + 917 = 50435
Step 56: 50435 + 917 = 51352
Step 57: 51352 + 917 = 52269
Step 58: 52269 + 917 = 53186
Step 59: 53186 + 917 = 54103
Step 60: 54103 + 917 = 55020
Step 61: 55020 + 917 = 55937
Step 62: 55937 + 917 = 56854
Step 63: 56854 + 917 = 57771
Step 64: 57771 + 917 = 58688
Step 65: 58688 + 917 = 59605
Step 66: 59605 + 917 = 60522
Step 67: 60522 + 917 = 61439
Step 68: 61439 + 917 = 62356
Step 69: 62356 + 917 = 63273
Step 70: 63273 + 917 = 64190
Step 71: 64190 + 917 = 65107
Step 72: 65107 + 917 = 66024
Step 73: 66024 + 917 = 66941
Step 74: 66941 + 917 = 67858
Step 75: 67858 + 917 = 68775
Step 76: 68775 + 917 = 69692
Step 77: 69692 + 917 = 70609
Step 78: 70609 + 917 = 71526
Step 79: 71526 + 917 = 72443
Step 80: 72443 + 917 = 73360
Step 81: 73360 + 917 = 74277
Step 82: 74277 + 917 = 75194
Step 83: 75194 + 917 = 76111
Step 84: 76111 + 917 = 77028
Step 85: 77028 + 917 = 77945
Step 86: 77945 + 917 = 78862
Step 87: 78862 + 917 = 79779
Step 88: 79779 + 917 = 80696
Step 89: 80696 + 917 = 81613
Step 90: 81613 + 917 = 82530
Step 91: 82530 + 917 = 83447
Step 92: 83447 + 917 = 84364
Step 93: 84364 + 917 = 85281
Step 94: 85281 + 917 = 86198
Step 95: 86198 + 917 = 87115
Step 96: 87115 + 917 = 88032
Step 97: 88032 + 917 = 88949
Step 98: 88949 + 917 = 89866
Step 99: 89866 + 917 = 90783
Step 100: 90783 + 917 = 91700
Step 101: 91700 + 917 = 92617
Step 102: 92617 + 917 = 93534
Step 103: 93534 + 917 = 94451
Step 104: 94451 + 917 = 95368
Step 105: 95368 + 917 = 96285
Step 106: 96285 + 917 = 97202
Step 107: 97202 + 917 = 98119
Step 108: 98119 + 917 = 99036
Step 109: 99036 + 917 = 99953
Step 110: 99953 + 917 = 100870
Step 111: 100870 + 917 = 101787
Step 112: 101787 + 917 = 102704
Step 113: 102704 + 917 = 103621
Step 114: 103621 + 917 = 104538
Step 115: 104538 + 917 = 105455
Step 116: 105455 + 917 = 106372
Step 117: 106372 + 917 = 107289
Step 118: 107289 + 917 = 108206
Step 119: 108206 + 917 = 109123
Step 120: 109123 + 917 = 110040
Step 121: 110040 + 917 = 110957
Step 122: 110957 + 917 = 111874
Step 123: 111874 + 917 = 112791

So, 917*123 = 112791