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TIMSS results in the number content and number sense ability of students in Indonesia are still low. This research aims to train and familiarize students of the junior high school to work on problems in TIMSS using number sense abilities. The process of developing test instruments in this research was through the stages of the Plomp development model that are (1) preliminary investigation phase; (2) design phase; (3) realization phase; (4) test, evaluation and revision phase, and (5) implementation phase. This research produced a good quality test. The test instrument has met the criteria of valid, reliable, objective and practical included 4 item with high validity categories and 14 items of medium validity categories. The level of reliability is very high with r 11 = 0.884, objective from the results of reliability and practical from the student response questionnaire analysis with the average student giving a positive response of 72.1%. The results of the research reveal that the test instruments that can measure the number sense ability are in the low category with an average percentage in the overall number sense indicator of 44.26% and from the interview results, students have not used all the indicators of the number sensing ability well.

Development of TIMSS Model Test to Measure The Number Sense Ability of Junior High School Students