OK, let's work through this together. We're starting with 270 and we're going to multiply it by 87, which means we add 270 to itself 87 times.
Step 1: 0 + 270 = 270
Step 2: 270 + 270 = 540
Step 3: 540 + 270 = 810
Step 4: 810 + 270 = 1080
Step 5: 1080 + 270 = 1350
Step 6: 1350 + 270 = 1620
Step 7: 1620 + 270 = 1890
Step 8: 1890 + 270 = 2160
Step 9: 2160 + 270 = 2430
Step 10: 2430 + 270 = 2700
Step 11: 2700 + 270 = 2970
Step 12: 2970 + 270 = 3240
Step 13: 3240 + 270 = 3510
Step 14: 3510 + 270 = 3780
Step 15: 3780 + 270 = 4050
Step 16: 4050 + 270 = 4320
Step 17: 4320 + 270 = 4590
Step 18: 4590 + 270 = 4860
Step 19: 4860 + 270 = 5130
Step 20: 5130 + 270 = 5400
Step 21: 5400 + 270 = 5670
Step 22: 5670 + 270 = 5940
Step 23: 5940 + 270 = 6210
Step 24: 6210 + 270 = 6480
Step 25: 6480 + 270 = 6750
Step 26: 6750 + 270 = 7020
Step 27: 7020 + 270 = 7290
Step 28: 7290 + 270 = 7560
Step 29: 7560 + 270 = 7830
Step 30: 7830 + 270 = 8100
Step 31: 8100 + 270 = 8370
Step 32: 8370 + 270 = 8640
Step 33: 8640 + 270 = 8910
Step 34: 8910 + 270 = 9180
Step 35: 9180 + 270 = 9450
Step 36: 9450 + 270 = 9720
Step 37: 9720 + 270 = 9990
Step 38: 9990 + 270 = 10260
Step 39: 10260 + 270 = 10530
Step 40: 10530 + 270 = 10800
Step 41: 10800 + 270 = 11070
Step 42: 11070 + 270 = 11340
Step 43: 11340 + 270 = 11610
Step 44: 11610 + 270 = 11880
Step 45: 11880 + 270 = 12150
Step 46: 12150 + 270 = 12420
Step 47: 12420 + 270 = 12690
Step 48: 12690 + 270 = 12960
Step 49: 12960 + 270 = 13230
Step 50: 13230 + 270 = 13500
Step 51: 13500 + 270 = 13770
Step 52: 13770 + 270 = 14040
Step 53: 14040 + 270 = 14310
Step 54: 14310 + 270 = 14580
Step 55: 14580 + 270 = 14850
Step 56: 14850 + 270 = 15120
Step 57: 15120 + 270 = 15390
Step 58: 15390 + 270 = 15660
Step 59: 15660 + 270 = 15930
Step 60: 15930 + 270 = 16200
Step 61: 16200 + 270 = 16470
Step 62: 16470 + 270 = 16740
Step 63: 16740 + 270 = 17010
Step 64: 17010 + 270 = 17280
Step 65: 17280 + 270 = 17550
Step 66: 17550 + 270 = 17820
Step 67: 17820 + 270 = 18090
Step 68: 18090 + 270 = 18360
Step 69: 18360 + 270 = 18630
Step 70: 18630 + 270 = 18900
Step 71: 18900 + 270 = 19170
Step 72: 19170 + 270 = 19440
Step 73: 19440 + 270 = 19710
Step 74: 19710 + 270 = 19980
Step 75: 19980 + 270 = 20250
Step 76: 20250 + 270 = 20520
Step 77: 20520 + 270 = 20790
Step 78: 20790 + 270 = 21060
Step 79: 21060 + 270 = 21330
Step 80: 21330 + 270 = 21600
Step 81: 21600 + 270 = 21870
Step 82: 21870 + 270 = 22140
Step 83: 22140 + 270 = 22410
Step 84: 22410 + 270 = 22680
Step 85: 22680 + 270 = 22950
Step 86: 22950 + 270 = 23220
Step 87: 23220 + 270 = 23490

So, 270*87 = 23490