When presented correctly and accompanied with an incentive program, there are 2 skills that are both very satisfying even thrilling, and of course very practical. They are mastering pictorial mnemonics and mental math. I am new to the forums and do not know how and if attachments can be made, but if it is possible send me the instructions how to do this and I will bli neder that's without a promise try to post pdf files, that can train your children in these two extremely useful skills / disciplines.