Penelitian ini bertujuan untuk mengetahui pengaruh model pembelajaran kooperatif tipe  think talk write terhadap kemampuan pemahaman konsep matematis siswa SMP. Penelitian ini dilakukan di SMP Negeri 1 Kragilan. Metode yang digunakan dalam penelitian ini adalah quasi eksperimen. Teknik pengumpulan data yaitu tes pemahaman konsep matematika. Hasil penelitian menunjukkan bahwa (1) Pencapaian akhir kemampuan pemahaman konsep matematika siswa yang mendapatkan model pembelajaran think talk write lebih tinggi daripada siswa yang mendapatkan model pembelajaran ekspositori; (2) Peningkatan kemampuan pemahaman konsep matematika  siswa yang mendapatkan model pembelajaran think talk write, lebih tinggi siswa yang mendapatkan daripada siswa yang mendapatkan model pembelajaran ekspositori.

Traditional musical instruments are cultural heritage that must be preserved. This is done so that the existence of this instrument is not extinct and can continue to be known until the next generation. Lebak is one area that has several diverse traditional musical instruments, traditional musical instruments such as lojor dogs, angklungbuhun, and lisung which play various ways and produce different sounds. The introduction of musical instruments early is needed to preserve culture in childhood requires methods and ways for the introduction of this instrument can be done with fun. One method that can be used is to present the knowledge of this musical instrument by utilizing animation media based on Android applications. This application not only presents the visual form of musical instruments, but also displays the sounds of each ethnic musical instrument. The purpose of this research is to increase children’s knowledge about traditional musical instruments. This research produces an Android-based application animation media that will present information about a typical Lebak musical instrument that is presented to be understood by early childhood. So that their understanding of traditional musical instruments increased.

This research is motivated by technological developments and globalization which directly affect the development of lifestyles and the degradation of the understanding of local wisdom in the Lebak district. Thus, the learning revolution from offline to online has become a momentum in developing and introducing Lebak local wisdom. The implementation of this research is carried out by using the Lebak Unique mobile application in social studies learning in elementary schools, which will be a reference for teachers in carrying out online learning, especially in social studies learning that adheres to the concepts of innovation, creativity, and local wisdom. This study aims to increase students' understanding and love for Lebak local wisdom by using nonequivalent control group design research methods. The results of the statistical test showed that there was a significant difference between the classes that used the application and those that did not. Through the PostHoc LSD test, it was known that the difference between the control class and the Experimental class was -10,86861 with a significance value of 0.05, so it can be concluded that the Lebak Unique application can be utilized in the environment. Education for the development of students' understanding and love of Lebak local wisdom.

Penelitian ini bertujuan untuk mengetahui pengaruh model pembelajaran kooperatif tipe  the power of two terhadap kemampuan komunikasi matematis siswa SMP. Penelitian ini dilakukan di SMP Pariskian. Metode yang digunakan dalam penelitian ini adalah quasi eksperimen. Teknik sampel yang digunakan yaitu cluster random sampling. Teknik pengumpulan data yaitu tes kemampuan komunikasi matematis. Hasil penelitian menunjukkan bahwa (1) Pencapaian akhir kemampuan komunikasi matematis siswa yang mendapatkan model pembelajaran the power of two lebih tinggi daripada siswa yang mendapatkan model pembelajaran ekspositori; (2) Peningkatan kemampuan komunikasi matematis  siswa yang mendapatkan model pembelajaran the power of two, lebih tinggi siswa yang mendapatkan daripada siswa yang mendapatkan model pembelajaran ekspositori.