OK, let's crack this. We're given 539 and our task is to multiply it by 86. Essentially, we'll be adding 539 to itself 86 times.
Step 1: 0 + 539 = 539
Step 2: 539 + 539 = 1078
Step 3: 1078 + 539 = 1617
Step 4: 1617 + 539 = 2156
Step 5: 2156 + 539 = 2695
Step 6: 2695 + 539 = 3234
Step 7: 3234 + 539 = 3773
Step 8: 3773 + 539 = 4312
Step 9: 4312 + 539 = 4851
Step 10: 4851 + 539 = 5390
Step 11: 5390 + 539 = 5929
Step 12: 5929 + 539 = 6468
Step 13: 6468 + 539 = 7007
Step 14: 7007 + 539 = 7546
Step 15: 7546 + 539 = 8085
Step 16: 8085 + 539 = 8624
Step 17: 8624 + 539 = 9163
Step 18: 9163 + 539 = 9702
Step 19: 9702 + 539 = 10241
Step 20: 10241 + 539 = 10780
Step 21: 10780 + 539 = 11319
Step 22: 11319 + 539 = 11858
Step 23: 11858 + 539 = 12397
Step 24: 12397 + 539 = 12936
Step 25: 12936 + 539 = 13475
Step 26: 13475 + 539 = 14014
Step 27: 14014 + 539 = 14553
Step 28: 14553 + 539 = 15092
Step 29: 15092 + 539 = 15631
Step 30: 15631 + 539 = 16170
Step 31: 16170 + 539 = 16709
Step 32: 16709 + 539 = 17248
Step 33: 17248 + 539 = 17787
Step 34: 17787 + 539 = 18326
Step 35: 18326 + 539 = 18865
Step 36: 18865 + 539 = 19404
Step 37: 19404 + 539 = 19943
Step 38: 19943 + 539 = 20482
Step 39: 20482 + 539 = 21021
Step 40: 21021 + 539 = 21560
Step 41: 21560 + 539 = 22099
Step 42: 22099 + 539 = 22638
Step 43: 22638 + 539 = 23177
Step 44: 23177 + 539 = 23716
Step 45: 23716 + 539 = 24255
Step 46: 24255 + 539 = 24794
Step 47: 24794 + 539 = 25333
Step 48: 25333 + 539 = 25872
Step 49: 25872 + 539 = 26411
Step 50: 26411 + 539 = 26950
Step 51: 26950 + 539 = 27489
Step 52: 27489 + 539 = 28028
Step 53: 28028 + 539 = 28567
Step 54: 28567 + 539 = 29106
Step 55: 29106 + 539 = 29645
Step 56: 29645 + 539 = 30184
Step 57: 30184 + 539 = 30723
Step 58: 30723 + 539 = 31262
Step 59: 31262 + 539 = 31801
Step 60: 31801 + 539 = 32340
Step 61: 32340 + 539 = 32879
Step 62: 32879 + 539 = 33418
Step 63: 33418 + 539 = 33957
Step 64: 33957 + 539 = 34496
Step 65: 34496 + 539 = 35035
Step 66: 35035 + 539 = 35574
Step 67: 35574 + 539 = 36113
Step 68: 36113 + 539 = 36652
Step 69: 36652 + 539 = 37191
Step 70: 37191 + 539 = 37730
Step 71: 37730 + 539 = 38269
Step 72: 38269 + 539 = 38808
Step 73: 38808 + 539 = 39347
Step 74: 39347 + 539 = 39886
Step 75: 39886 + 539 = 40425
Step 76: 40425 + 539 = 40964
Step 77: 40964 + 539 = 41503
Step 78: 41503 + 539 = 42042
Step 79: 42042 + 539 = 42581
Step 80: 42581 + 539 = 43120
Step 81: 43120 + 539 = 43659
Step 82: 43659 + 539 = 44198
Step 83: 44198 + 539 = 44737
Step 84: 44737 + 539 = 45276
Step 85: 45276 + 539 = 45815
Step 86: 45815 + 539 = 46354

So, 539*86 = 46354