Let's get this math done. We have 591 and we're going to multiply it by 87. This is the same as taking 591 and adding it to itself 87 times.
Step 1: 0 + 591 = 591
Step 2: 591 + 591 = 1182
Step 3: 1182 + 591 = 1773
Step 4: 1773 + 591 = 2364
Step 5: 2364 + 591 = 2955
Step 6: 2955 + 591 = 3546
Step 7: 3546 + 591 = 4137
Step 8: 4137 + 591 = 4728
Step 9: 4728 + 591 = 5319
Step 10: 5319 + 591 = 5910
Step 11: 5910 + 591 = 6501
Step 12: 6501 + 591 = 7092
Step 13: 7092 + 591 = 7683
Step 14: 7683 + 591 = 8274
Step 15: 8274 + 591 = 8865
Step 16: 8865 + 591 = 9456
Step 17: 9456 + 591 = 10047
Step 18: 10047 + 591 = 10638
Step 19: 10638 + 591 = 11229
Step 20: 11229 + 591 = 11820
Step 21: 11820 + 591 = 12411
Step 22: 12411 + 591 = 13002
Step 23: 13002 + 591 = 13593
Step 24: 13593 + 591 = 14184
Step 25: 14184 + 591 = 14775
Step 26: 14775 + 591 = 15366
Step 27: 15366 + 591 = 15957
Step 28: 15957 + 591 = 16548
Step 29: 16548 + 591 = 17139
Step 30: 17139 + 591 = 17730
Step 31: 17730 + 591 = 18321
Step 32: 18321 + 591 = 18912
Step 33: 18912 + 591 = 19503
Step 34: 19503 + 591 = 20094
Step 35: 20094 + 591 = 20685
Step 36: 20685 + 591 = 21276
Step 37: 21276 + 591 = 21867
Step 38: 21867 + 591 = 22458
Step 39: 22458 + 591 = 23049
Step 40: 23049 + 591 = 23640
Step 41: 23640 + 591 = 24231
Step 42: 24231 + 591 = 24822
Step 43: 24822 + 591 = 25413
Step 44: 25413 + 591 = 26004
Step 45: 26004 + 591 = 26595
Step 46: 26595 + 591 = 27186
Step 47: 27186 + 591 = 27777
Step 48: 27777 + 591 = 28368
Step 49: 28368 + 591 = 28959
Step 50: 28959 + 591 = 29550
Step 51: 29550 + 591 = 30141
Step 52: 30141 + 591 = 30732
Step 53: 30732 + 591 = 31323
Step 54: 31323 + 591 = 31914
Step 55: 31914 + 591 = 32505
Step 56: 32505 + 591 = 33096
Step 57: 33096 + 591 = 33687
Step 58: 33687 + 591 = 34278
Step 59: 34278 + 591 = 34869
Step 60: 34869 + 591 = 35460
Step 61: 35460 + 591 = 36051
Step 62: 36051 + 591 = 36642
Step 63: 36642 + 591 = 37233
Step 64: 37233 + 591 = 37824
Step 65: 37824 + 591 = 38415
Step 66: 38415 + 591 = 39006
Step 67: 39006 + 591 = 39597
Step 68: 39597 + 591 = 40188
Step 69: 40188 + 591 = 40779
Step 70: 40779 + 591 = 41370
Step 71: 41370 + 591 = 41961
Step 72: 41961 + 591 = 42552
Step 73: 42552 + 591 = 43143
Step 74: 43143 + 591 = 43734
Step 75: 43734 + 591 = 44325
Step 76: 44325 + 591 = 44916
Step 77: 44916 + 591 = 45507
Step 78: 45507 + 591 = 46098
Step 79: 46098 + 591 = 46689
Step 80: 46689 + 591 = 47280
Step 81: 47280 + 591 = 47871
Step 82: 47871 + 591 = 48462
Step 83: 48462 + 591 = 49053
Step 84: 49053 + 591 = 49644
Step 85: 49644 + 591 = 50235
Step 86: 50235 + 591 = 50826
Step 87: 50826 + 591 = 51417

So, 591*87 = 51417