I have used the Prime Factors Code Kata in one of my presentations to show TDD. It's easy and short and perfectly for a small demo during lecture on code quality/software craftsmanship. But the students complain, that there is too much math in the problem. And it's true, most of them don't know what a prime factor is :-(
So what would be a similar kata in time needed to perform it? I know of several katas but I haven't done them all, so I can't compare. E.g. the String Word Wrap Kata is simple too, but needs more coding, so would break my lecture schedule.
In fact I'm searching for a suitable replacement of the Prime Factors code kata, but any list of simple code katas, e.g. Prime Factors, Word Wrap, will do.