Pasaribu, P.F., Kristin, F. and Anugraheni, I. 2019. Improvement of primary school students’ activeness and outcome using discovery learning model in mathematics. Jurnal Pendidikan dan Pengajaran. 52, 2 (Jul. 2019), 87–92. DOI:https://doi.org/10.23887/jpp.v52i2.18261.