Let's roll up our sleeves and solve this. We have 168 and we're going to multiply it by 84, essentially adding 168 to itself 84 times.
Step 1: 0 + 168 = 168
Step 2: 168 + 168 = 336
Step 3: 336 + 168 = 504
Step 4: 504 + 168 = 672
Step 5: 672 + 168 = 840
Step 6: 840 + 168 = 1008
Step 7: 1008 + 168 = 1176
Step 8: 1176 + 168 = 1344
Step 9: 1344 + 168 = 1512
Step 10: 1512 + 168 = 1680
Step 11: 1680 + 168 = 1848
Step 12: 1848 + 168 = 2016
Step 13: 2016 + 168 = 2184
Step 14: 2184 + 168 = 2352
Step 15: 2352 + 168 = 2520
Step 16: 2520 + 168 = 2688
Step 17: 2688 + 168 = 2856
Step 18: 2856 + 168 = 3024
Step 19: 3024 + 168 = 3192
Step 20: 3192 + 168 = 3360
Step 21: 3360 + 168 = 3528
Step 22: 3528 + 168 = 3696
Step 23: 3696 + 168 = 3864
Step 24: 3864 + 168 = 4032
Step 25: 4032 + 168 = 4200
Step 26: 4200 + 168 = 4368
Step 27: 4368 + 168 = 4536
Step 28: 4536 + 168 = 4704
Step 29: 4704 + 168 = 4872
Step 30: 4872 + 168 = 5040
Step 31: 5040 + 168 = 5208
Step 32: 5208 + 168 = 5376
Step 33: 5376 + 168 = 5544
Step 34: 5544 + 168 = 5712
Step 35: 5712 + 168 = 5880
Step 36: 5880 + 168 = 6048
Step 37: 6048 + 168 = 6216
Step 38: 6216 + 168 = 6384
Step 39: 6384 + 168 = 6552
Step 40: 6552 + 168 = 6720
Step 41: 6720 + 168 = 6888
Step 42: 6888 + 168 = 7056
Step 43: 7056 + 168 = 7224
Step 44: 7224 + 168 = 7392
Step 45: 7392 + 168 = 7560
Step 46: 7560 + 168 = 7728
Step 47: 7728 + 168 = 7896
Step 48: 7896 + 168 = 8064
Step 49: 8064 + 168 = 8232
Step 50: 8232 + 168 = 8400
Step 51: 8400 + 168 = 8568
Step 52: 8568 + 168 = 8736
Step 53: 8736 + 168 = 8904
Step 54: 8904 + 168 = 9072
Step 55: 9072 + 168 = 9240
Step 56: 9240 + 168 = 9408
Step 57: 9408 + 168 = 9576
Step 58: 9576 + 168 = 9744
Step 59: 9744 + 168 = 9912
Step 60: 9912 + 168 = 10080
Step 61: 10080 + 168 = 10248
Step 62: 10248 + 168 = 10416
Step 63: 10416 + 168 = 10584
Step 64: 10584 + 168 = 10752
Step 65: 10752 + 168 = 10920
Step 66: 10920 + 168 = 11088
Step 67: 11088 + 168 = 11256
Step 68: 11256 + 168 = 11424
Step 69: 11424 + 168 = 11592
Step 70: 11592 + 168 = 11760
Step 71: 11760 + 168 = 11928
Step 72: 11928 + 168 = 12096
Step 73: 12096 + 168 = 12264
Step 74: 12264 + 168 = 12432
Step 75: 12432 + 168 = 12600
Step 76: 12600 + 168 = 12768
Step 77: 12768 + 168 = 12936
Step 78: 12936 + 168 = 13104
Step 79: 13104 + 168 = 13272
Step 80: 13272 + 168 = 13440
Step 81: 13440 + 168 = 13608
Step 82: 13608 + 168 = 13776
Step 83: 13776 + 168 = 13944
Step 84: 13944 + 168 = 14112

So, 168*84 = 14112