Development of LKPD based on ethnomathematics of batik motifs typical of Magelang to increase understanding of the concept of geometric transformation

The existence of a Student Worksheet (LKPD) is able to improve the ability understand students' concepts. This research aims develop LKPD based on ethnomathematics batik motifs typical Magelang in terms concepts validity, practicality, and effectiveness geometric transformation materials. type used development (R&D) with 4D model, namely defining stage, design deployment stage. study was conducted at SMP Negeri 1 Tegalrejo sample 31 students class IX B. results showed that an produced increase understanding concept valid or feasible validity value by material expert validators teaching validators, which 86.31% very category. Judging from practicality response students, 89.61% practical standard gain increased were obtained 5 low classification learners, 10 medium 16 high students. Increasing using pretest posttest calculated formula <g> , 0.62 moderate category, so said be effective.