Construction of Open-Ended Problems for Assessing Elementary Student Mathematical Connection Ability on Plane Geometry

Abstract

The aim of this study is to construct open-ended problems about plane geometry for measuring mathematical connection ability. And to determine the profile of mathematical connection ability. The instrument test is 4 geometry problems. The problems is assessing four ability in mathematical connection at elementary school. The subject of this research is 50 students 6th grade of one elementary school in Bandung. The instrument is repairing base on suggestions from the four expert validation. The result validity of instrument show that problem no. 1 is 0,579 with categories enough validity, problem no. 2 is 0,809, no. 3 is 0,765, and no. 4 is 0,790 with categories high validity. The validation test show that instrument is a good quality. The reliability of instrument show 0,762 with categories high reliability. The distinguishing capacity for instrument no. 1 is 0,2857 with categories enough, no. 2 is 0,8036 and no. 3 is 0,7679 with categories very good, no. 4 is 0,4643 with categories good. The difficulty level of question for no. 1, 2, 3 is moderate, and no. 4 is difficult. The profile of mathematical connection ability of 6th grade elementary students on plane geometry is low. Base on result and analysis, the conclusion is that open-ended problem can be used to assessing elementary student mathematical connection ability.