Without delay, let's solve this. We've got 766 and we will be multiplying it by 20, that is, adding 766 to itself 20 times.
Step 1: 0 + 766 = 766
Step 2: 766 + 766 = 1532
Step 3: 1532 + 766 = 2298
Step 4: 2298 + 766 = 3064
Step 5: 3064 + 766 = 3830
Step 6: 3830 + 766 = 4596
Step 7: 4596 + 766 = 5362
Step 8: 5362 + 766 = 6128
Step 9: 6128 + 766 = 6894
Step 10: 6894 + 766 = 7660
Step 11: 7660 + 766 = 8426
Step 12: 8426 + 766 = 9192
Step 13: 9192 + 766 = 9958
Step 14: 9958 + 766 = 10724
Step 15: 10724 + 766 = 11490
Step 16: 11490 + 766 = 12256
Step 17: 12256 + 766 = 13022
Step 18: 13022 + 766 = 13788
Step 19: 13788 + 766 = 14554
Step 20: 14554 + 766 = 15320

So, 766*20 = 15320