OK, let's work through this together. We're starting with 863 and we're going to multiply it by 87, which means we add 863 to itself 87 times.
Step 1: 0 + 863 = 863
Step 2: 863 + 863 = 1726
Step 3: 1726 + 863 = 2589
Step 4: 2589 + 863 = 3452
Step 5: 3452 + 863 = 4315
Step 6: 4315 + 863 = 5178
Step 7: 5178 + 863 = 6041
Step 8: 6041 + 863 = 6904
Step 9: 6904 + 863 = 7767
Step 10: 7767 + 863 = 8630
Step 11: 8630 + 863 = 9493
Step 12: 9493 + 863 = 10356
Step 13: 10356 + 863 = 11219
Step 14: 11219 + 863 = 12082
Step 15: 12082 + 863 = 12945
Step 16: 12945 + 863 = 13808
Step 17: 13808 + 863 = 14671
Step 18: 14671 + 863 = 15534
Step 19: 15534 + 863 = 16397
Step 20: 16397 + 863 = 17260
Step 21: 17260 + 863 = 18123
Step 22: 18123 + 863 = 18986
Step 23: 18986 + 863 = 19849
Step 24: 19849 + 863 = 20712
Step 25: 20712 + 863 = 21575
Step 26: 21575 + 863 = 22438
Step 27: 22438 + 863 = 23301
Step 28: 23301 + 863 = 24164
Step 29: 24164 + 863 = 25027
Step 30: 25027 + 863 = 25890
Step 31: 25890 + 863 = 26753
Step 32: 26753 + 863 = 27616
Step 33: 27616 + 863 = 28479
Step 34: 28479 + 863 = 29342
Step 35: 29342 + 863 = 30205
Step 36: 30205 + 863 = 31068
Step 37: 31068 + 863 = 31931
Step 38: 31931 + 863 = 32794
Step 39: 32794 + 863 = 33657
Step 40: 33657 + 863 = 34520
Step 41: 34520 + 863 = 35383
Step 42: 35383 + 863 = 36246
Step 43: 36246 + 863 = 37109
Step 44: 37109 + 863 = 37972
Step 45: 37972 + 863 = 38835
Step 46: 38835 + 863 = 39698
Step 47: 39698 + 863 = 40561
Step 48: 40561 + 863 = 41424
Step 49: 41424 + 863 = 42287
Step 50: 42287 + 863 = 43150
Step 51: 43150 + 863 = 44013
Step 52: 44013 + 863 = 44876
Step 53: 44876 + 863 = 45739
Step 54: 45739 + 863 = 46602
Step 55: 46602 + 863 = 47465
Step 56: 47465 + 863 = 48328
Step 57: 48328 + 863 = 49191
Step 58: 49191 + 863 = 50054
Step 59: 50054 + 863 = 50917
Step 60: 50917 + 863 = 51780
Step 61: 51780 + 863 = 52643
Step 62: 52643 + 863 = 53506
Step 63: 53506 + 863 = 54369
Step 64: 54369 + 863 = 55232
Step 65: 55232 + 863 = 56095
Step 66: 56095 + 863 = 56958
Step 67: 56958 + 863 = 57821
Step 68: 57821 + 863 = 58684
Step 69: 58684 + 863 = 59547
Step 70: 59547 + 863 = 60410
Step 71: 60410 + 863 = 61273
Step 72: 61273 + 863 = 62136
Step 73: 62136 + 863 = 62999
Step 74: 62999 + 863 = 63862
Step 75: 63862 + 863 = 64725
Step 76: 64725 + 863 = 65588
Step 77: 65588 + 863 = 66451
Step 78: 66451 + 863 = 67314
Step 79: 67314 + 863 = 68177
Step 80: 68177 + 863 = 69040
Step 81: 69040 + 863 = 69903
Step 82: 69903 + 863 = 70766
Step 83: 70766 + 863 = 71629
Step 84: 71629 + 863 = 72492
Step 85: 72492 + 863 = 73355
Step 86: 73355 + 863 = 74218
Step 87: 74218 + 863 = 75081

So, 863*87 = 75081