Without delay, let's solve this. We've got 915 and we will be multiplying it by 109, that is, adding 915 to itself 109 times.
Step 1: 0 + 915 = 915
Step 2: 915 + 915 = 1830
Step 3: 1830 + 915 = 2745
Step 4: 2745 + 915 = 3660
Step 5: 3660 + 915 = 4575
Step 6: 4575 + 915 = 5490
Step 7: 5490 + 915 = 6405
Step 8: 6405 + 915 = 7320
Step 9: 7320 + 915 = 8235
Step 10: 8235 + 915 = 9150
Step 11: 9150 + 915 = 10065
Step 12: 10065 + 915 = 10980
Step 13: 10980 + 915 = 11895
Step 14: 11895 + 915 = 12810
Step 15: 12810 + 915 = 13725
Step 16: 13725 + 915 = 14640
Step 17: 14640 + 915 = 15555
Step 18: 15555 + 915 = 16470
Step 19: 16470 + 915 = 17385
Step 20: 17385 + 915 = 18300
Step 21: 18300 + 915 = 19215
Step 22: 19215 + 915 = 20130
Step 23: 20130 + 915 = 21045
Step 24: 21045 + 915 = 21960
Step 25: 21960 + 915 = 22875
Step 26: 22875 + 915 = 23790
Step 27: 23790 + 915 = 24705
Step 28: 24705 + 915 = 25620
Step 29: 25620 + 915 = 26535
Step 30: 26535 + 915 = 27450
Step 31: 27450 + 915 = 28365
Step 32: 28365 + 915 = 29280
Step 33: 29280 + 915 = 30195
Step 34: 30195 + 915 = 31110
Step 35: 31110 + 915 = 32025
Step 36: 32025 + 915 = 32940
Step 37: 32940 + 915 = 33855
Step 38: 33855 + 915 = 34770
Step 39: 34770 + 915 = 35685
Step 40: 35685 + 915 = 36600
Step 41: 36600 + 915 = 37515
Step 42: 37515 + 915 = 38430
Step 43: 38430 + 915 = 39345
Step 44: 39345 + 915 = 40260
Step 45: 40260 + 915 = 41175
Step 46: 41175 + 915 = 42090
Step 47: 42090 + 915 = 43005
Step 48: 43005 + 915 = 43920
Step 49: 43920 + 915 = 44835
Step 50: 44835 + 915 = 45750
Step 51: 45750 + 915 = 46665
Step 52: 46665 + 915 = 47580
Step 53: 47580 + 915 = 48495
Step 54: 48495 + 915 = 49410
Step 55: 49410 + 915 = 50325
Step 56: 50325 + 915 = 51240
Step 57: 51240 + 915 = 52155
Step 58: 52155 + 915 = 53070
Step 59: 53070 + 915 = 53985
Step 60: 53985 + 915 = 54900
Step 61: 54900 + 915 = 55815
Step 62: 55815 + 915 = 56730
Step 63: 56730 + 915 = 57645
Step 64: 57645 + 915 = 58560
Step 65: 58560 + 915 = 59475
Step 66: 59475 + 915 = 60390
Step 67: 60390 + 915 = 61305
Step 68: 61305 + 915 = 62220
Step 69: 62220 + 915 = 63135
Step 70: 63135 + 915 = 64050
Step 71: 64050 + 915 = 64965
Step 72: 64965 + 915 = 65880
Step 73: 65880 + 915 = 66795
Step 74: 66795 + 915 = 67710
Step 75: 67710 + 915 = 68625
Step 76: 68625 + 915 = 69540
Step 77: 69540 + 915 = 70455
Step 78: 70455 + 915 = 71370
Step 79: 71370 + 915 = 72285
Step 80: 72285 + 915 = 73200
Step 81: 73200 + 915 = 74115
Step 82: 74115 + 915 = 75030
Step 83: 75030 + 915 = 75945
Step 84: 75945 + 915 = 76860
Step 85: 76860 + 915 = 77775
Step 86: 77775 + 915 = 78690
Step 87: 78690 + 915 = 79605
Step 88: 79605 + 915 = 80520
Step 89: 80520 + 915 = 81435
Step 90: 81435 + 915 = 82350
Step 91: 82350 + 915 = 83265
Step 92: 83265 + 915 = 84180
Step 93: 84180 + 915 = 85095
Step 94: 85095 + 915 = 86010
Step 95: 86010 + 915 = 86925
Step 96: 86925 + 915 = 87840
Step 97: 87840 + 915 = 88755
Step 98: 88755 + 915 = 89670
Step 99: 89670 + 915 = 90585
Step 100: 90585 + 915 = 91500
Step 101: 91500 + 915 = 92415
Step 102: 92415 + 915 = 93330
Step 103: 93330 + 915 = 94245
Step 104: 94245 + 915 = 95160
Step 105: 95160 + 915 = 96075
Step 106: 96075 + 915 = 96990
Step 107: 96990 + 915 = 97905
Step 108: 97905 + 915 = 98820
Step 109: 98820 + 915 = 99735

So, 915*109 = 99735