This study aims to develop a learning media based on the local wisdom of becak (pedicab) assisted by the Android to improve the mathematical representation and critical thinking abilities. It used the 4D model. The data were collected using a written test, and analysed by using the analysis of the gain scores. The result shows that the developed media based on the local wisdom of pedicab assisted by the Android (CAKA) is in a very good category and can be used as a learning media. The CAKA media can improve the mathematical representation and critical thinking abilities of grade X students of senior high school.