Without delay, let's solve this. We've got 799 and we will be multiplying it by 16, that is, adding 799 to itself 16 times.
Step 1: 0 + 799 = 799
Step 2: 799 + 799 = 1598
Step 3: 1598 + 799 = 2397
Step 4: 2397 + 799 = 3196
Step 5: 3196 + 799 = 3995
Step 6: 3995 + 799 = 4794
Step 7: 4794 + 799 = 5593
Step 8: 5593 + 799 = 6392
Step 9: 6392 + 799 = 7191
Step 10: 7191 + 799 = 7990
Step 11: 7990 + 799 = 8789
Step 12: 8789 + 799 = 9588
Step 13: 9588 + 799 = 10387
Step 14: 10387 + 799 = 11186
Step 15: 11186 + 799 = 11985
Step 16: 11985 + 799 = 12784

So, 799*16 = 12784