We were just repeating prisms (cube and block). I also realized that it is better to have the preparation prepared on one sheet of paper. I had it on 3 papers and then, when you put the paper away somewhere, in the meantime it explains something, it loses an overview of which paper follows and where it lies at all. This does not occur to a person at home until he really tries it - even so, a trivial thing can decide a person at that moment.
I had it on 3 papers and then, when you put the paper away somewhere, in the meantime it explains something, it loses an overview of which paper follows and where it lies at all.