Sure thing, let's get straight to it. We start with 515 and we're going to multiply it by 68, which means adding 515 to itself 68 times.
Step 1: 0 + 515 = 515
Step 2: 515 + 515 = 1030
Step 3: 1030 + 515 = 1545
Step 4: 1545 + 515 = 2060
Step 5: 2060 + 515 = 2575
Step 6: 2575 + 515 = 3090
Step 7: 3090 + 515 = 3605
Step 8: 3605 + 515 = 4120
Step 9: 4120 + 515 = 4635
Step 10: 4635 + 515 = 5150
Step 11: 5150 + 515 = 5665
Step 12: 5665 + 515 = 6180
Step 13: 6180 + 515 = 6695
Step 14: 6695 + 515 = 7210
Step 15: 7210 + 515 = 7725
Step 16: 7725 + 515 = 8240
Step 17: 8240 + 515 = 8755
Step 18: 8755 + 515 = 9270
Step 19: 9270 + 515 = 9785
Step 20: 9785 + 515 = 10300
Step 21: 10300 + 515 = 10815
Step 22: 10815 + 515 = 11330
Step 23: 11330 + 515 = 11845
Step 24: 11845 + 515 = 12360
Step 25: 12360 + 515 = 12875
Step 26: 12875 + 515 = 13390
Step 27: 13390 + 515 = 13905
Step 28: 13905 + 515 = 14420
Step 29: 14420 + 515 = 14935
Step 30: 14935 + 515 = 15450
Step 31: 15450 + 515 = 15965
Step 32: 15965 + 515 = 16480
Step 33: 16480 + 515 = 16995
Step 34: 16995 + 515 = 17510
Step 35: 17510 + 515 = 18025
Step 36: 18025 + 515 = 18540
Step 37: 18540 + 515 = 19055
Step 38: 19055 + 515 = 19570
Step 39: 19570 + 515 = 20085
Step 40: 20085 + 515 = 20600
Step 41: 20600 + 515 = 21115
Step 42: 21115 + 515 = 21630
Step 43: 21630 + 515 = 22145
Step 44: 22145 + 515 = 22660
Step 45: 22660 + 515 = 23175
Step 46: 23175 + 515 = 23690
Step 47: 23690 + 515 = 24205
Step 48: 24205 + 515 = 24720
Step 49: 24720 + 515 = 25235
Step 50: 25235 + 515 = 25750
Step 51: 25750 + 515 = 26265
Step 52: 26265 + 515 = 26780
Step 53: 26780 + 515 = 27295
Step 54: 27295 + 515 = 27810
Step 55: 27810 + 515 = 28325
Step 56: 28325 + 515 = 28840
Step 57: 28840 + 515 = 29355
Step 58: 29355 + 515 = 29870
Step 59: 29870 + 515 = 30385
Step 60: 30385 + 515 = 30900
Step 61: 30900 + 515 = 31415
Step 62: 31415 + 515 = 31930
Step 63: 31930 + 515 = 32445
Step 64: 32445 + 515 = 32960
Step 65: 32960 + 515 = 33475
Step 66: 33475 + 515 = 33990
Step 67: 33990 + 515 = 34505
Step 68: 34505 + 515 = 35020

So, 515*68 = 35020