In this article, we will present the first results of a class experiment regarding text-based problems. The 6th-grade students from the experiment met the teaching of textbased problems for the first time. The main aim of the experiment was the diagnosis and possible remedy of the problems with working memory. As to the problems encountered during the teaching experiment, we will analyze the comparative results of the pre-test and the post-test, then will draw some conclusions for the teaching practice.