Without delay, let's solve this. We've got 504 and we will be multiplying it by 68, that is, adding 504 to itself 68 times.
Step 1: 0 + 504 = 504
Step 2: 504 + 504 = 1008
Step 3: 1008 + 504 = 1512
Step 4: 1512 + 504 = 2016
Step 5: 2016 + 504 = 2520
Step 6: 2520 + 504 = 3024
Step 7: 3024 + 504 = 3528
Step 8: 3528 + 504 = 4032
Step 9: 4032 + 504 = 4536
Step 10: 4536 + 504 = 5040
Step 11: 5040 + 504 = 5544
Step 12: 5544 + 504 = 6048
Step 13: 6048 + 504 = 6552
Step 14: 6552 + 504 = 7056
Step 15: 7056 + 504 = 7560
Step 16: 7560 + 504 = 8064
Step 17: 8064 + 504 = 8568
Step 18: 8568 + 504 = 9072
Step 19: 9072 + 504 = 9576
Step 20: 9576 + 504 = 10080
Step 21: 10080 + 504 = 10584
Step 22: 10584 + 504 = 11088
Step 23: 11088 + 504 = 11592
Step 24: 11592 + 504 = 12096
Step 25: 12096 + 504 = 12600
Step 26: 12600 + 504 = 13104
Step 27: 13104 + 504 = 13608
Step 28: 13608 + 504 = 14112
Step 29: 14112 + 504 = 14616
Step 30: 14616 + 504 = 15120
Step 31: 15120 + 504 = 15624
Step 32: 15624 + 504 = 16128
Step 33: 16128 + 504 = 16632
Step 34: 16632 + 504 = 17136
Step 35: 17136 + 504 = 17640
Step 36: 17640 + 504 = 18144
Step 37: 18144 + 504 = 18648
Step 38: 18648 + 504 = 19152
Step 39: 19152 + 504 = 19656
Step 40: 19656 + 504 = 20160
Step 41: 20160 + 504 = 20664
Step 42: 20664 + 504 = 21168
Step 43: 21168 + 504 = 21672
Step 44: 21672 + 504 = 22176
Step 45: 22176 + 504 = 22680
Step 46: 22680 + 504 = 23184
Step 47: 23184 + 504 = 23688
Step 48: 23688 + 504 = 24192
Step 49: 24192 + 504 = 24696
Step 50: 24696 + 504 = 25200
Step 51: 25200 + 504 = 25704
Step 52: 25704 + 504 = 26208
Step 53: 26208 + 504 = 26712
Step 54: 26712 + 504 = 27216
Step 55: 27216 + 504 = 27720
Step 56: 27720 + 504 = 28224
Step 57: 28224 + 504 = 28728
Step 58: 28728 + 504 = 29232
Step 59: 29232 + 504 = 29736
Step 60: 29736 + 504 = 30240
Step 61: 30240 + 504 = 30744
Step 62: 30744 + 504 = 31248
Step 63: 31248 + 504 = 31752
Step 64: 31752 + 504 = 32256
Step 65: 32256 + 504 = 32760
Step 66: 32760 + 504 = 33264
Step 67: 33264 + 504 = 33768
Step 68: 33768 + 504 = 34272

So, 504*68 = 34272