Without delay, let's solve this. We've got 285 and we will be multiplying it by 100, that is, adding 285 to itself 100 times.
Step 1: 0 + 285 = 285
Step 2: 285 + 285 = 570
Step 3: 570 + 285 = 855
Step 4: 855 + 285 = 1140
Step 5: 1140 + 285 = 1425
Step 6: 1425 + 285 = 1710
Step 7: 1710 + 285 = 1995
Step 8: 1995 + 285 = 2280
Step 9: 2280 + 285 = 2565
Step 10: 2565 + 285 = 2850
Step 11: 2850 + 285 = 3135
Step 12: 3135 + 285 = 3420
Step 13: 3420 + 285 = 3705
Step 14: 3705 + 285 = 3990
Step 15: 3990 + 285 = 4275
Step 16: 4275 + 285 = 4560
Step 17: 4560 + 285 = 4845
Step 18: 4845 + 285 = 5130
Step 19: 5130 + 285 = 5415
Step 20: 5415 + 285 = 5700
Step 21: 5700 + 285 = 5985
Step 22: 5985 + 285 = 6270
Step 23: 6270 + 285 = 6555
Step 24: 6555 + 285 = 6840
Step 25: 6840 + 285 = 7125
Step 26: 7125 + 285 = 7410
Step 27: 7410 + 285 = 7695
Step 28: 7695 + 285 = 7980
Step 29: 7980 + 285 = 8265
Step 30: 8265 + 285 = 8550
Step 31: 8550 + 285 = 8835
Step 32: 8835 + 285 = 9120
Step 33: 9120 + 285 = 9405
Step 34: 9405 + 285 = 9690
Step 35: 9690 + 285 = 9975
Step 36: 9975 + 285 = 10260
Step 37: 10260 + 285 = 10545
Step 38: 10545 + 285 = 10830
Step 39: 10830 + 285 = 11115
Step 40: 11115 + 285 = 11400
Step 41: 11400 + 285 = 11685
Step 42: 11685 + 285 = 11970
Step 43: 11970 + 285 = 12255
Step 44: 12255 + 285 = 12540
Step 45: 12540 + 285 = 12825
Step 46: 12825 + 285 = 13110
Step 47: 13110 + 285 = 13395
Step 48: 13395 + 285 = 13680
Step 49: 13680 + 285 = 13965
Step 50: 13965 + 285 = 14250
Step 51: 14250 + 285 = 14535
Step 52: 14535 + 285 = 14820
Step 53: 14820 + 285 = 15105
Step 54: 15105 + 285 = 15390
Step 55: 15390 + 285 = 15675
Step 56: 15675 + 285 = 15960
Step 57: 15960 + 285 = 16245
Step 58: 16245 + 285 = 16530
Step 59: 16530 + 285 = 16815
Step 60: 16815 + 285 = 17100
Step 61: 17100 + 285 = 17385
Step 62: 17385 + 285 = 17670
Step 63: 17670 + 285 = 17955
Step 64: 17955 + 285 = 18240
Step 65: 18240 + 285 = 18525
Step 66: 18525 + 285 = 18810
Step 67: 18810 + 285 = 19095
Step 68: 19095 + 285 = 19380
Step 69: 19380 + 285 = 19665
Step 70: 19665 + 285 = 19950
Step 71: 19950 + 285 = 20235
Step 72: 20235 + 285 = 20520
Step 73: 20520 + 285 = 20805
Step 74: 20805 + 285 = 21090
Step 75: 21090 + 285 = 21375
Step 76: 21375 + 285 = 21660
Step 77: 21660 + 285 = 21945
Step 78: 21945 + 285 = 22230
Step 79: 22230 + 285 = 22515
Step 80: 22515 + 285 = 22800
Step 81: 22800 + 285 = 23085
Step 82: 23085 + 285 = 23370
Step 83: 23370 + 285 = 23655
Step 84: 23655 + 285 = 23940
Step 85: 23940 + 285 = 24225
Step 86: 24225 + 285 = 24510
Step 87: 24510 + 285 = 24795
Step 88: 24795 + 285 = 25080
Step 89: 25080 + 285 = 25365
Step 90: 25365 + 285 = 25650
Step 91: 25650 + 285 = 25935
Step 92: 25935 + 285 = 26220
Step 93: 26220 + 285 = 26505
Step 94: 26505 + 285 = 26790
Step 95: 26790 + 285 = 27075
Step 96: 27075 + 285 = 27360
Step 97: 27360 + 285 = 27645
Step 98: 27645 + 285 = 27930
Step 99: 27930 + 285 = 28215
Step 100: 28215 + 285 = 28500

So, 285*100 = 28500