The purpose of this research was to study the prevalence of cyberloafing among students in the classroom. 150 (63 are boys and 84 are girls) schoolchildren living in the Ural region of the Russian Federation between the ages of 13 and 15 took part in the study. For the collection of empirical data, we used the scale of cyberloafing Y. Akbulut et al., translated into Russian. Student's T-criterion was used to analyze differences in cyberloafing levels in children of different sexes. The results of the research showed that during lessons they are most often interested in content and communicate with friends. The girls are more prone to cyberloafing than the boys. Girls are more likely to go to social media lessons and communicate online. Boys are more likely to play on the lessons in games on their mobile gadgets.