Mathematics is mostly related to human life, thus, humans are required to have the mathematical understanding ability in solving life problems since in the elementary school age. Therefore, mathematics learning at school should have relevance value to construct mathematical concept that can be used in real life.  Innovative mathematics learning through Contextual Learning (CTL) model based on Sundanese Culture Ethnomathematics as a local wisdom at which humans use mathematics in their real life, was chosen as a deep solution to increase the mathematical understanding ability, because students live in their culture and society. This study employsan experimental method by conducting pretest and postest control group design. The purpose of this study is to determine the increasing of students’ mathematical understanding ability on experiment class (using CTL model based on Sundanese Ethnomathematics) and control class (using conventional learning model). The result of this study produced conclusion that CTL based on Sundanese ethnomahtematics and conventional model can increasethe mathematical understanding ability significantly. However, the application of CTL model based on Sundanese Ethnomathematics was significantly better than conventional model (62.29%) to increase students’ mathematical understanding ability on learning the basic concepts of rectangular geometry for 4th grade students of elementary school.

This development research aimed to produce picture book products based on character education that can improve literacy culture in elementary schools. A picture story book is a book that combines text and illustrations so that it becomes a story book that can increase students' reading interest. Picture story books can tell a story that is collaborated with an interesting and meaningful concept for children's development. The method used was the method of research and development (R&D) with the development model of Borg and Gall. This research and development had 9 stages of research, namely research and information gathering, planning, product draft development, initial field testing, product revision, main field test, operational product revision, field implementation test and final product revision. Respondents in research and development involved one material expert, one linguist, one media expert, 13 students of SDSN Bendungan Hilir 12 Pagi, 21 students of SDS Ar-Rahman Motik. The results showed that the character education-based picture book product was considered very good. The average result according to the expert was 97.1%, the Small Group Evaluation was 96.6%, and the Field Test was 94.33%. This picture book product was attractive to students who loved reading because reading was the key to increase literacy culture since elementary school age.