The article is the result of an experimental study on teaching computational informatics to future teachers of informatics in a pedagogical university. The experiment was carried out on the basis of the Institute of Mathematics, Physics and Informatics of the Kazakh National Pedagogical University named after Abai. The methodology and methods for organizing and conducting experimental work in the field of computational informatics are described. The analysis of the results of the experimental work is presented graphically in the form of tables and diagrams. The reliability of the obtained results was checked in MS Excel. The difference between the results of the experimental group and the results obtained in the control group is significant and statistically significant. Pearson's χ2 was used to assess the significance of differences. As a result of the experimental work, the effectiveness of the developed methodology for teaching computational informatics to future teachers of informatics is tested in the context of a competency-based approach.