Let's roll up our sleeves and solve this. We have 186 and we're going to multiply it by 87, essentially adding 186 to itself 87 times.
Step 1: 0 + 186 = 186
Step 2: 186 + 186 = 372
Step 3: 372 + 186 = 558
Step 4: 558 + 186 = 744
Step 5: 744 + 186 = 930
Step 6: 930 + 186 = 1116
Step 7: 1116 + 186 = 1302
Step 8: 1302 + 186 = 1488
Step 9: 1488 + 186 = 1674
Step 10: 1674 + 186 = 1860
Step 11: 1860 + 186 = 2046
Step 12: 2046 + 186 = 2232
Step 13: 2232 + 186 = 2418
Step 14: 2418 + 186 = 2604
Step 15: 2604 + 186 = 2790
Step 16: 2790 + 186 = 2976
Step 17: 2976 + 186 = 3162
Step 18: 3162 + 186 = 3348
Step 19: 3348 + 186 = 3534
Step 20: 3534 + 186 = 3720
Step 21: 3720 + 186 = 3906
Step 22: 3906 + 186 = 4092
Step 23: 4092 + 186 = 4278
Step 24: 4278 + 186 = 4464
Step 25: 4464 + 186 = 4650
Step 26: 4650 + 186 = 4836
Step 27: 4836 + 186 = 5022
Step 28: 5022 + 186 = 5208
Step 29: 5208 + 186 = 5394
Step 30: 5394 + 186 = 5580
Step 31: 5580 + 186 = 5766
Step 32: 5766 + 186 = 5952
Step 33: 5952 + 186 = 6138
Step 34: 6138 + 186 = 6324
Step 35: 6324 + 186 = 6510
Step 36: 6510 + 186 = 6696
Step 37: 6696 + 186 = 6882
Step 38: 6882 + 186 = 7068
Step 39: 7068 + 186 = 7254
Step 40: 7254 + 186 = 7440
Step 41: 7440 + 186 = 7626
Step 42: 7626 + 186 = 7812
Step 43: 7812 + 186 = 7998
Step 44: 7998 + 186 = 8184
Step 45: 8184 + 186 = 8370
Step 46: 8370 + 186 = 8556
Step 47: 8556 + 186 = 8742
Step 48: 8742 + 186 = 8928
Step 49: 8928 + 186 = 9114
Step 50: 9114 + 186 = 9300
Step 51: 9300 + 186 = 9486
Step 52: 9486 + 186 = 9672
Step 53: 9672 + 186 = 9858
Step 54: 9858 + 186 = 10044
Step 55: 10044 + 186 = 10230
Step 56: 10230 + 186 = 10416
Step 57: 10416 + 186 = 10602
Step 58: 10602 + 186 = 10788
Step 59: 10788 + 186 = 10974
Step 60: 10974 + 186 = 11160
Step 61: 11160 + 186 = 11346
Step 62: 11346 + 186 = 11532
Step 63: 11532 + 186 = 11718
Step 64: 11718 + 186 = 11904
Step 65: 11904 + 186 = 12090
Step 66: 12090 + 186 = 12276
Step 67: 12276 + 186 = 12462
Step 68: 12462 + 186 = 12648
Step 69: 12648 + 186 = 12834
Step 70: 12834 + 186 = 13020
Step 71: 13020 + 186 = 13206
Step 72: 13206 + 186 = 13392
Step 73: 13392 + 186 = 13578
Step 74: 13578 + 186 = 13764
Step 75: 13764 + 186 = 13950
Step 76: 13950 + 186 = 14136
Step 77: 14136 + 186 = 14322
Step 78: 14322 + 186 = 14508
Step 79: 14508 + 186 = 14694
Step 80: 14694 + 186 = 14880
Step 81: 14880 + 186 = 15066
Step 82: 15066 + 186 = 15252
Step 83: 15252 + 186 = 15438
Step 84: 15438 + 186 = 15624
Step 85: 15624 + 186 = 15810
Step 86: 15810 + 186 = 15996
Step 87: 15996 + 186 = 16182

So, 186*87 = 16182