If you try to do that for all multiplication you might end up with something like 10*6 = 60 - 6 = 54 - 6 = 48 - 6 = 42 - 6 = 36 and even then the subtractions are going to involve some memorization unless you are counting down or something.

You kinda need to have the basic operations involving the 10 digits in our common number system memorized to then start building algorithms for more complicated problems like multi digit numbers.

For me diet sodas taste fine for like 2 seconds and then they turn disgusting