Implementation of virtual manipulative using problem-based learning on topic algebra for seventh grade student

The aim of this study to find out the learning design of virtual manipulative using Problem Based Learning (PBL) on seventh grade student in algebra concept. This study was conducted at Junior High School Santo Aloysius Turi from October to February 2019. The research subjects were students of class VIIB (pilot experiment) and VIIA (teaching experiment) in 2018/2019. The type of research used in this study is design research, where researchers design Hypothetical Learning Trajectory (HLT) to teach algebraic operating using virtual manipulative with PBL models. The research stages are preliminary design, experimental design which includes a pilot experiment and teaching experiments, and retrospective analysis. Data collection methods used are documentation, field notes, written tests, and unstructured interviews. Technical data analysis is used according to Miles and Huberman methods, including data reduction, data display, and verification or conclusion. The results showed that the design of learning with virtual manipulative using the Problem Based Learning (PBL) model on the topic of algebraic in class VII of Junior High School Santo Aloysius Turi is as follows: at the point of the preliminary test it can be observed that students still have difficulty in connecting problems into algebraic forms, using the concept of associative and distributive properties to simplify algebraic forms according to their operations in addition, subtraction and multiplication of algebraic forms. Using virtual manipulative with the PBL model can help students to construct their knowledge in order to understand associative and distributive properties used to simplify algebraic forms.