Alright, let's solve this math problem step by step. First, we have the number 765. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 51. So, we're going to take the number 765 and add it to itself 51 times.
Step 1: 0 + 765 = 765
Step 2: 765 + 765 = 1530
Step 3: 1530 + 765 = 2295
Step 4: 2295 + 765 = 3060
Step 5: 3060 + 765 = 3825
Step 6: 3825 + 765 = 4590
Step 7: 4590 + 765 = 5355
Step 8: 5355 + 765 = 6120
Step 9: 6120 + 765 = 6885
Step 10: 6885 + 765 = 7650
Step 11: 7650 + 765 = 8415
Step 12: 8415 + 765 = 9180
Step 13: 9180 + 765 = 9945
Step 14: 9945 + 765 = 10710
Step 15: 10710 + 765 = 11475
Step 16: 11475 + 765 = 12240
Step 17: 12240 + 765 = 13005
Step 18: 13005 + 765 = 13770
Step 19: 13770 + 765 = 14535
Step 20: 14535 + 765 = 15300
Step 21: 15300 + 765 = 16065
Step 22: 16065 + 765 = 16830
Step 23: 16830 + 765 = 17595
Step 24: 17595 + 765 = 18360
Step 25: 18360 + 765 = 19125
Step 26: 19125 + 765 = 19890
Step 27: 19890 + 765 = 20655
Step 28: 20655 + 765 = 21420
Step 29: 21420 + 765 = 22185
Step 30: 22185 + 765 = 22950
Step 31: 22950 + 765 = 23715
Step 32: 23715 + 765 = 24480
Step 33: 24480 + 765 = 25245
Step 34: 25245 + 765 = 26010
Step 35: 26010 + 765 = 26775
Step 36: 26775 + 765 = 27540
Step 37: 27540 + 765 = 28305
Step 38: 28305 + 765 = 29070
Step 39: 29070 + 765 = 29835
Step 40: 29835 + 765 = 30600
Step 41: 30600 + 765 = 31365
Step 42: 31365 + 765 = 32130
Step 43: 32130 + 765 = 32895
Step 44: 32895 + 765 = 33660
Step 45: 33660 + 765 = 34425
Step 46: 34425 + 765 = 35190
Step 47: 35190 + 765 = 35955
Step 48: 35955 + 765 = 36720
Step 49: 36720 + 765 = 37485
Step 50: 37485 + 765 = 38250
Step 51: 38250 + 765 = 39015

So, 765*51 = 39015