Sirnayetti S. Improving Student Achievement In Creative Integer Addition And Reduction Method Through Demonstrations With Equipment P Eraga Pinus Cards Fourth Grade Students Of Sdn 35 Parak Karakah East Padang District School Year 2015/2016. JIPS [Internet]. 2018 Oct. 27 [cited 2024 Dec. 22];1(2):62-70. Available from: https://e-journal.sastra-unes.com/index.php/JIPS/article/view/248