Let's roll up our sleeves and solve this. We have 542 and we're going to multiply it by 87, essentially adding 542 to itself 87 times.
Step 1: 0 + 542 = 542
Step 2: 542 + 542 = 1084
Step 3: 1084 + 542 = 1626
Step 4: 1626 + 542 = 2168
Step 5: 2168 + 542 = 2710
Step 6: 2710 + 542 = 3252
Step 7: 3252 + 542 = 3794
Step 8: 3794 + 542 = 4336
Step 9: 4336 + 542 = 4878
Step 10: 4878 + 542 = 5420
Step 11: 5420 + 542 = 5962
Step 12: 5962 + 542 = 6504
Step 13: 6504 + 542 = 7046
Step 14: 7046 + 542 = 7588
Step 15: 7588 + 542 = 8130
Step 16: 8130 + 542 = 8672
Step 17: 8672 + 542 = 9214
Step 18: 9214 + 542 = 9756
Step 19: 9756 + 542 = 10298
Step 20: 10298 + 542 = 10840
Step 21: 10840 + 542 = 11382
Step 22: 11382 + 542 = 11924
Step 23: 11924 + 542 = 12466
Step 24: 12466 + 542 = 13008
Step 25: 13008 + 542 = 13550
Step 26: 13550 + 542 = 14092
Step 27: 14092 + 542 = 14634
Step 28: 14634 + 542 = 15176
Step 29: 15176 + 542 = 15718
Step 30: 15718 + 542 = 16260
Step 31: 16260 + 542 = 16802
Step 32: 16802 + 542 = 17344
Step 33: 17344 + 542 = 17886
Step 34: 17886 + 542 = 18428
Step 35: 18428 + 542 = 18970
Step 36: 18970 + 542 = 19512
Step 37: 19512 + 542 = 20054
Step 38: 20054 + 542 = 20596
Step 39: 20596 + 542 = 21138
Step 40: 21138 + 542 = 21680
Step 41: 21680 + 542 = 22222
Step 42: 22222 + 542 = 22764
Step 43: 22764 + 542 = 23306
Step 44: 23306 + 542 = 23848
Step 45: 23848 + 542 = 24390
Step 46: 24390 + 542 = 24932
Step 47: 24932 + 542 = 25474
Step 48: 25474 + 542 = 26016
Step 49: 26016 + 542 = 26558
Step 50: 26558 + 542 = 27100
Step 51: 27100 + 542 = 27642
Step 52: 27642 + 542 = 28184
Step 53: 28184 + 542 = 28726
Step 54: 28726 + 542 = 29268
Step 55: 29268 + 542 = 29810
Step 56: 29810 + 542 = 30352
Step 57: 30352 + 542 = 30894
Step 58: 30894 + 542 = 31436
Step 59: 31436 + 542 = 31978
Step 60: 31978 + 542 = 32520
Step 61: 32520 + 542 = 33062
Step 62: 33062 + 542 = 33604
Step 63: 33604 + 542 = 34146
Step 64: 34146 + 542 = 34688
Step 65: 34688 + 542 = 35230
Step 66: 35230 + 542 = 35772
Step 67: 35772 + 542 = 36314
Step 68: 36314 + 542 = 36856
Step 69: 36856 + 542 = 37398
Step 70: 37398 + 542 = 37940
Step 71: 37940 + 542 = 38482
Step 72: 38482 + 542 = 39024
Step 73: 39024 + 542 = 39566
Step 74: 39566 + 542 = 40108
Step 75: 40108 + 542 = 40650
Step 76: 40650 + 542 = 41192
Step 77: 41192 + 542 = 41734
Step 78: 41734 + 542 = 42276
Step 79: 42276 + 542 = 42818
Step 80: 42818 + 542 = 43360
Step 81: 43360 + 542 = 43902
Step 82: 43902 + 542 = 44444
Step 83: 44444 + 542 = 44986
Step 84: 44986 + 542 = 45528
Step 85: 45528 + 542 = 46070
Step 86: 46070 + 542 = 46612
Step 87: 46612 + 542 = 47154

So, 542*87 = 47154