Let's get this math done. We have 510 and we're going to multiply it by 102. This is the same as taking 510 and adding it to itself 102 times.
Step 1: 0 + 510 = 510
Step 2: 510 + 510 = 1020
Step 3: 1020 + 510 = 1530
Step 4: 1530 + 510 = 2040
Step 5: 2040 + 510 = 2550
Step 6: 2550 + 510 = 3060
Step 7: 3060 + 510 = 3570
Step 8: 3570 + 510 = 4080
Step 9: 4080 + 510 = 4590
Step 10: 4590 + 510 = 5100
Step 11: 5100 + 510 = 5610
Step 12: 5610 + 510 = 6120
Step 13: 6120 + 510 = 6630
Step 14: 6630 + 510 = 7140
Step 15: 7140 + 510 = 7650
Step 16: 7650 + 510 = 8160
Step 17: 8160 + 510 = 8670
Step 18: 8670 + 510 = 9180
Step 19: 9180 + 510 = 9690
Step 20: 9690 + 510 = 10200
Step 21: 10200 + 510 = 10710
Step 22: 10710 + 510 = 11220
Step 23: 11220 + 510 = 11730
Step 24: 11730 + 510 = 12240
Step 25: 12240 + 510 = 12750
Step 26: 12750 + 510 = 13260
Step 27: 13260 + 510 = 13770
Step 28: 13770 + 510 = 14280
Step 29: 14280 + 510 = 14790
Step 30: 14790 + 510 = 15300
Step 31: 15300 + 510 = 15810
Step 32: 15810 + 510 = 16320
Step 33: 16320 + 510 = 16830
Step 34: 16830 + 510 = 17340
Step 35: 17340 + 510 = 17850
Step 36: 17850 + 510 = 18360
Step 37: 18360 + 510 = 18870
Step 38: 18870 + 510 = 19380
Step 39: 19380 + 510 = 19890
Step 40: 19890 + 510 = 20400
Step 41: 20400 + 510 = 20910
Step 42: 20910 + 510 = 21420
Step 43: 21420 + 510 = 21930
Step 44: 21930 + 510 = 22440
Step 45: 22440 + 510 = 22950
Step 46: 22950 + 510 = 23460
Step 47: 23460 + 510 = 23970
Step 48: 23970 + 510 = 24480
Step 49: 24480 + 510 = 24990
Step 50: 24990 + 510 = 25500
Step 51: 25500 + 510 = 26010
Step 52: 26010 + 510 = 26520
Step 53: 26520 + 510 = 27030
Step 54: 27030 + 510 = 27540
Step 55: 27540 + 510 = 28050
Step 56: 28050 + 510 = 28560
Step 57: 28560 + 510 = 29070
Step 58: 29070 + 510 = 29580
Step 59: 29580 + 510 = 30090
Step 60: 30090 + 510 = 30600
Step 61: 30600 + 510 = 31110
Step 62: 31110 + 510 = 31620
Step 63: 31620 + 510 = 32130
Step 64: 32130 + 510 = 32640
Step 65: 32640 + 510 = 33150
Step 66: 33150 + 510 = 33660
Step 67: 33660 + 510 = 34170
Step 68: 34170 + 510 = 34680
Step 69: 34680 + 510 = 35190
Step 70: 35190 + 510 = 35700
Step 71: 35700 + 510 = 36210
Step 72: 36210 + 510 = 36720
Step 73: 36720 + 510 = 37230
Step 74: 37230 + 510 = 37740
Step 75: 37740 + 510 = 38250
Step 76: 38250 + 510 = 38760
Step 77: 38760 + 510 = 39270
Step 78: 39270 + 510 = 39780
Step 79: 39780 + 510 = 40290
Step 80: 40290 + 510 = 40800
Step 81: 40800 + 510 = 41310
Step 82: 41310 + 510 = 41820
Step 83: 41820 + 510 = 42330
Step 84: 42330 + 510 = 42840
Step 85: 42840 + 510 = 43350
Step 86: 43350 + 510 = 43860
Step 87: 43860 + 510 = 44370
Step 88: 44370 + 510 = 44880
Step 89: 44880 + 510 = 45390
Step 90: 45390 + 510 = 45900
Step 91: 45900 + 510 = 46410
Step 92: 46410 + 510 = 46920
Step 93: 46920 + 510 = 47430
Step 94: 47430 + 510 = 47940
Step 95: 47940 + 510 = 48450
Step 96: 48450 + 510 = 48960
Step 97: 48960 + 510 = 49470
Step 98: 49470 + 510 = 49980
Step 99: 49980 + 510 = 50490
Step 100: 50490 + 510 = 51000
Step 101: 51000 + 510 = 51510
Step 102: 51510 + 510 = 52020

So, 510*102 = 52020