The pupils were constantly having problems with the formulas, even though the teacher said that they had it long ago, so they know it. We started to cut. Simple expressions first. It worked quite well. It probably doesn't make sense to describe here exactly how exactly it went. Most of all, I want to say that even the second lesson, when we were discussing shortening expressions, the students were not able to use the formulas. It was as if they had NEVER heard of ANY PATTERNS.
It probably doesn't make sense to describe here exactly how exactly it went.