"يلا نتعلم رياضيات الصف الرابع" is a free Android app designed by Mohamed Aly El-Sayed that aims to help fourth-grade students learn math in an interactive and engaging way. The app is focused on the Egyptian curriculum and covers various topics such as addition, subtraction, multiplication, division, and fractions.

The app features a user-friendly interface that makes it easy for students to navigate and find the topics they need to study. The app includes a variety of lessons, quizzes, and games that help students practice what they have learned. The lessons are presented in an interactive way, with colorful graphics and animations that make learning fun and engaging.

Overall, "يلا نتعلم رياضيات الصف الرابع" is a great app for fourth-grade students who want to improve their math skills. The app is free to download and use, making it accessible to all students. However, it is important to note that the app is focused on the Egyptian curriculum and may not be suitable for students in other countries or regions.