Hacker attack

Books of the series "Mathematical quest" will turn the study of mathematics into a simple and fascinating process. The reader will become the main character of history and will go on a trip to pages full of mathematical tasks.
"Hacker attack" will talk about a dangerous virus, which is about to destroy the school computer system. The reader will have to fight him, and in the process to get acquainted with the interesting world of statistics and solve many problems. The book itself will direct the hero to the desired page in accordance with the choice made by him. The correct answer will make it possible to advance on the plot, and the mistake will transfer to the previous page, where you can try again. Adventure on each page!
for primary school age