Alright, let's solve this math problem step by step. First, we have the number 285. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 81. So, we're going to take the number 285 and add it to itself 81 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

So, 285*81 = 23085