Development of Numbers Material Test Using the Item Response Theory (IRT) Approach for SD Students

The purpose of the research is to produce a product in form valid and reliable measuring instrument for student numeracy that can be used schools general public. stages will carried out based on test development design, namely Preparing Test Specifications, Items, Testing Items Field, Revision Development. question grid 2013 curriculum syllabus. was conducted elementary school students. response results dichotomous data analyzed using item theory (IRT) model with two logistical parameters (2PL), level difficulty discriminating power. Estimation capability BILOG MG program. Before doing analysis IRT. study contained 18 items could measure students' skills. Among these are numbered questions 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18. meet criteria good including having level, then distinguishing power functions well has validity reliability.