Let's roll up our sleeves and solve this. We have 305 and we're going to multiply it by 115, essentially adding 305 to itself 115 times.
Step 1: 0 + 305 = 305
Step 2: 305 + 305 = 610
Step 3: 610 + 305 = 915
Step 4: 915 + 305 = 1220
Step 5: 1220 + 305 = 1525
Step 6: 1525 + 305 = 1830
Step 7: 1830 + 305 = 2135
Step 8: 2135 + 305 = 2440
Step 9: 2440 + 305 = 2745
Step 10: 2745 + 305 = 3050
Step 11: 3050 + 305 = 3355
Step 12: 3355 + 305 = 3660
Step 13: 3660 + 305 = 3965
Step 14: 3965 + 305 = 4270
Step 15: 4270 + 305 = 4575
Step 16: 4575 + 305 = 4880
Step 17: 4880 + 305 = 5185
Step 18: 5185 + 305 = 5490
Step 19: 5490 + 305 = 5795
Step 20: 5795 + 305 = 6100
Step 21: 6100 + 305 = 6405
Step 22: 6405 + 305 = 6710
Step 23: 6710 + 305 = 7015
Step 24: 7015 + 305 = 7320
Step 25: 7320 + 305 = 7625
Step 26: 7625 + 305 = 7930
Step 27: 7930 + 305 = 8235
Step 28: 8235 + 305 = 8540
Step 29: 8540 + 305 = 8845
Step 30: 8845 + 305 = 9150
Step 31: 9150 + 305 = 9455
Step 32: 9455 + 305 = 9760
Step 33: 9760 + 305 = 10065
Step 34: 10065 + 305 = 10370
Step 35: 10370 + 305 = 10675
Step 36: 10675 + 305 = 10980
Step 37: 10980 + 305 = 11285
Step 38: 11285 + 305 = 11590
Step 39: 11590 + 305 = 11895
Step 40: 11895 + 305 = 12200
Step 41: 12200 + 305 = 12505
Step 42: 12505 + 305 = 12810
Step 43: 12810 + 305 = 13115
Step 44: 13115 + 305 = 13420
Step 45: 13420 + 305 = 13725
Step 46: 13725 + 305 = 14030
Step 47: 14030 + 305 = 14335
Step 48: 14335 + 305 = 14640
Step 49: 14640 + 305 = 14945
Step 50: 14945 + 305 = 15250
Step 51: 15250 + 305 = 15555
Step 52: 15555 + 305 = 15860
Step 53: 15860 + 305 = 16165
Step 54: 16165 + 305 = 16470
Step 55: 16470 + 305 = 16775
Step 56: 16775 + 305 = 17080
Step 57: 17080 + 305 = 17385
Step 58: 17385 + 305 = 17690
Step 59: 17690 + 305 = 17995
Step 60: 17995 + 305 = 18300
Step 61: 18300 + 305 = 18605
Step 62: 18605 + 305 = 18910
Step 63: 18910 + 305 = 19215
Step 64: 19215 + 305 = 19520
Step 65: 19520 + 305 = 19825
Step 66: 19825 + 305 = 20130
Step 67: 20130 + 305 = 20435
Step 68: 20435 + 305 = 20740
Step 69: 20740 + 305 = 21045
Step 70: 21045 + 305 = 21350
Step 71: 21350 + 305 = 21655
Step 72: 21655 + 305 = 21960
Step 73: 21960 + 305 = 22265
Step 74: 22265 + 305 = 22570
Step 75: 22570 + 305 = 22875
Step 76: 22875 + 305 = 23180
Step 77: 23180 + 305 = 23485
Step 78: 23485 + 305 = 23790
Step 79: 23790 + 305 = 24095
Step 80: 24095 + 305 = 24400
Step 81: 24400 + 305 = 24705
Step 82: 24705 + 305 = 25010
Step 83: 25010 + 305 = 25315
Step 84: 25315 + 305 = 25620
Step 85: 25620 + 305 = 25925
Step 86: 25925 + 305 = 26230
Step 87: 26230 + 305 = 26535
Step 88: 26535 + 305 = 26840
Step 89: 26840 + 305 = 27145
Step 90: 27145 + 305 = 27450
Step 91: 27450 + 305 = 27755
Step 92: 27755 + 305 = 28060
Step 93: 28060 + 305 = 28365
Step 94: 28365 + 305 = 28670
Step 95: 28670 + 305 = 28975
Step 96: 28975 + 305 = 29280
Step 97: 29280 + 305 = 29585
Step 98: 29585 + 305 = 29890
Step 99: 29890 + 305 = 30195
Step 100: 30195 + 305 = 30500
Step 101: 30500 + 305 = 30805
Step 102: 30805 + 305 = 31110
Step 103: 31110 + 305 = 31415
Step 104: 31415 + 305 = 31720
Step 105: 31720 + 305 = 32025
Step 106: 32025 + 305 = 32330
Step 107: 32330 + 305 = 32635
Step 108: 32635 + 305 = 32940
Step 109: 32940 + 305 = 33245
Step 110: 33245 + 305 = 33550
Step 111: 33550 + 305 = 33855
Step 112: 33855 + 305 = 34160
Step 113: 34160 + 305 = 34465
Step 114: 34465 + 305 = 34770
Step 115: 34770 + 305 = 35075

So, 305*115 = 35075