### APPLICATION OF DISCOVERY LEARNING MODEL WITH CONCRETE MATERIALS TO IMPROVE MATHEMATICS LEARNING ABOUT PLANE FIGURES TO FOURTH GRADE STUDENTS OF SD NEGERI 2 TAMANWINANGUN IN ACADEMIC YEAR OF 2019/2020.

#### Abstract

*The **objectives of the research** **were**: (1) describ**ing** the steps **to** the application of Discovery Learning model with concrete m**aterials**, (2) improv**ing mathematics** learning about **plane figures** through Discovery Learning model with concrete m**aterials**, (3) analy**zing** **obstacles** and solutions **of** **applying **the Discovery Learning model with concrete m**aterials**.*

*Th**e** research **was** a collaborative classroom action research (CAR) conducted in three cycles**.** **There were** two meetings in each cycle**. A meeting consisted of** planning, implementing, observing, and reflecting. The subjects **were** 25 students** of fourth grade of SD Negeri 2 Tamanwinangun in academic year of 2019/2020**. The data used in the form of qualitative data **were** the application of the Discovery Learning model with concrete m**aterials while q**uantitative data **were** the results of** **mathematics **test**. Data** **collection techniques **included** observation, interviews, and tests. The validity of the data use**d** triangulation of techniques and triangulation of sources. **D**ata analysis include**d** data reduction, data presentation and **drawing **conclusions.*

*The results showed that: (1) the steps** to** **the application of the Discovery Learning model with concrete **materials** to improve mathematics learning about **plane figures** w**ere**: (a) **giving **stimulation **by** concrete m**aterials**, (b) **writing **problem statements, (c) collectin**g** **data, (d) processing data, (e) verif**ying**, (f) **making **generalization; (2) the application of Discovery Learning model with concrete m**aterials** **improve**d** mathematics learning about **plane figures** **to fourth **grade** students of** SDN 2 Tamanwinangun **in a**cademic **y**ear **of **2019/2020**. It was proven by** **the results of teacher observation**, **student observation**, and **learning outcomes**. The **results of **teacher observation were** **85.71%** **in the first cycle**,** 87.38% **in the **second cycle**,** and 90.17%** in the third **cycle. The results of student observation **were **85.57%** **in the first cycle, 87.50%** in the **second cycle, and 90.17%** in the** third cycle**. S**tudent learning outcomes **were **88%** **in the first cycle, 92% **in the **second cycle, and 94% **in the **third cycle; (3) the **obstacle**s **were**: (a) the teacher **faced lack **of class** mangement** when students **were** **not paying attention**, (b) **some** students **were passive **in group** discussion** **therefore the discussion took much time**. The solution**s** provided by the researcher **were** (a) the teacher **improved the class management**,** **(b) the teacher **gave tasks to the students **equally and **managed the** time** management**.*

*It **conclu**des that** application of Discovery Learning model with concrete m**aterials** **improve**s** **mathematics** learning about **plane figures** **t**o** **fourth grade **students **of SD Negeri 2 Tamanwinangun in academic year of 2019/2020**.*

*Keywords**: Discovery Learning, Concrete Ma**terials**, Mathematics*

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