A free app for Android, by Pham Thuy Nhan.

Đậu Lém – Toán 5 is a learning game with a cartoon character called Dau Lem that is an integration between entertainment and education. Dau Lem is a curious little boy that likes to explore the world. He also has a talent for solving math problems.

This game is based on the educational program of the Ministry of Education. It includes the following lessons:

Primary School Math Review: review the basic math concepts that have been reviewed in the primary school. 

Primary School Unit of Measurement: review the units of measurement and how to calculate the values. 

Primary School Fractions: learn to calculate the fractions. 

Secondary School Decimals: learn to calculate the decimal numbers.