Аннотация: The article presents a study devoted to the study of the possibilities of third-graders in achieving a greater formation of metacognitive actions associated with understanding the ways of solving problems. The experimental group of schoolchildren (88 people) was offered to master non-educational tasks of the author's program "Metacognition" in 20 lessons (one lesson per week). The final diagnostics showed that the children of the experimental group were significantly ahead of the children of the control group (84 people) in performing diagnostic tasks aimed at determining the formation of metacognitive actions associated with understanding the ways of solving problems.