This solution is like mimicking the multiplication process in math, in other words, how you multiply 12 by 5:

first, 2 (in 12) by 5 is 10. Because 10/10 == 1, we got a 1 here.
second, 1 (in 12) by 5. Because we got a 1 before, we get 5+1 == 6 here. 

If you write it down on a paper following this code, you will get it.