Treading of dangerous waters, here. But the following is a distillation of what I have read and hopefully understood about memory.
At some point your children will take exams and the more they can remember, facts and processes – know what and know hoy – the better they are likely to do in the exam, other things being equal.
It is important to be clear about two stages relating to memory.
The first is one that many teachers will already do well. Getting the stuff in. This starts with the teacher being very clear about what the student is to learn. Do they really need to hear, and potentially learn, that interesting story you always tell when teaching the topic? Really? I know you enjoy it and your children may well laugh but is it time well spent? Would it have been better to repeat the work in a different way rather than add a piece of narrative that is loosely connected to the thing you want them to learn?