We call it memoization when it's for computers. People need 0-9 for basic algorithm, 10 is useful for decimals / notation, 11 is easy to learn and 12 is debata

We call it memoization when it's for computers. People need 0-9 for basic algorithm, 10 is useful for decimals / notation, 11 is easy to learn and 12 is debatable, but potentially handy for base 12 systems which are fairly common. Beyond that we can learn fairly simple algorithms to do this sort of thing.