Alright, let's solve this math problem step by step. First, we have the number 521. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 87. So, we're going to take the number 521 and add it to itself 87 times.
Step 1: 0 + 521 = 521
Step 2: 521 + 521 = 1042
Step 3: 1042 + 521 = 1563
Step 4: 1563 + 521 = 2084
Step 5: 2084 + 521 = 2605
Step 6: 2605 + 521 = 3126
Step 7: 3126 + 521 = 3647
Step 8: 3647 + 521 = 4168
Step 9: 4168 + 521 = 4689
Step 10: 4689 + 521 = 5210
Step 11: 5210 + 521 = 5731
Step 12: 5731 + 521 = 6252
Step 13: 6252 + 521 = 6773
Step 14: 6773 + 521 = 7294
Step 15: 7294 + 521 = 7815
Step 16: 7815 + 521 = 8336
Step 17: 8336 + 521 = 8857
Step 18: 8857 + 521 = 9378
Step 19: 9378 + 521 = 9899
Step 20: 9899 + 521 = 10420
Step 21: 10420 + 521 = 10941
Step 22: 10941 + 521 = 11462
Step 23: 11462 + 521 = 11983
Step 24: 11983 + 521 = 12504
Step 25: 12504 + 521 = 13025
Step 26: 13025 + 521 = 13546
Step 27: 13546 + 521 = 14067
Step 28: 14067 + 521 = 14588
Step 29: 14588 + 521 = 15109
Step 30: 15109 + 521 = 15630
Step 31: 15630 + 521 = 16151
Step 32: 16151 + 521 = 16672
Step 33: 16672 + 521 = 17193
Step 34: 17193 + 521 = 17714
Step 35: 17714 + 521 = 18235
Step 36: 18235 + 521 = 18756
Step 37: 18756 + 521 = 19277
Step 38: 19277 + 521 = 19798
Step 39: 19798 + 521 = 20319
Step 40: 20319 + 521 = 20840
Step 41: 20840 + 521 = 21361
Step 42: 21361 + 521 = 21882
Step 43: 21882 + 521 = 22403
Step 44: 22403 + 521 = 22924
Step 45: 22924 + 521 = 23445
Step 46: 23445 + 521 = 23966
Step 47: 23966 + 521 = 24487
Step 48: 24487 + 521 = 25008
Step 49: 25008 + 521 = 25529
Step 50: 25529 + 521 = 26050
Step 51: 26050 + 521 = 26571
Step 52: 26571 + 521 = 27092
Step 53: 27092 + 521 = 27613
Step 54: 27613 + 521 = 28134
Step 55: 28134 + 521 = 28655
Step 56: 28655 + 521 = 29176
Step 57: 29176 + 521 = 29697
Step 58: 29697 + 521 = 30218
Step 59: 30218 + 521 = 30739
Step 60: 30739 + 521 = 31260
Step 61: 31260 + 521 = 31781
Step 62: 31781 + 521 = 32302
Step 63: 32302 + 521 = 32823
Step 64: 32823 + 521 = 33344
Step 65: 33344 + 521 = 33865
Step 66: 33865 + 521 = 34386
Step 67: 34386 + 521 = 34907
Step 68: 34907 + 521 = 35428
Step 69: 35428 + 521 = 35949
Step 70: 35949 + 521 = 36470
Step 71: 36470 + 521 = 36991
Step 72: 36991 + 521 = 37512
Step 73: 37512 + 521 = 38033
Step 74: 38033 + 521 = 38554
Step 75: 38554 + 521 = 39075
Step 76: 39075 + 521 = 39596
Step 77: 39596 + 521 = 40117
Step 78: 40117 + 521 = 40638
Step 79: 40638 + 521 = 41159
Step 80: 41159 + 521 = 41680
Step 81: 41680 + 521 = 42201
Step 82: 42201 + 521 = 42722
Step 83: 42722 + 521 = 43243
Step 84: 43243 + 521 = 43764
Step 85: 43764 + 521 = 44285
Step 86: 44285 + 521 = 44806
Step 87: 44806 + 521 = 45327

So, 521*87 = 45327