The difference of students’ mathematical concept understanding ability by using discovery learning and group investigation in SMK multi karya
Purba, Putri Anggraini, Sitompul, Pardomouan, Elvis Napitupulu, E.
Mathematical literacy: a bibliometric analysis
Nuraini, Nuraini, Hasratuddin, Hasratuddin, Elvis Napitupulu, E., Syahputra, Edi, Batubara, Ismail Hanif
Improving self-regulated learning through the wolfram alpha in mathematics learning
Sari, Nilam, Saragih, Sahat, Elvis Napitupulu, E., Syahputra, Edi, Simamora, Elmanani, Rakiyah, Siti, Novita Sari, Dwi, Anim, Anim