The Effect Instructional Approach and Authentic Assessment Toward an Achievement in Mathematics

Abstract

The objective of the research is to figure out the effect of instructional approach, and assessment authentic toward students' achievement in mathematics after controlling students' previous ability. The method used in this research is experimental method with 2x2 factorial design. The samples of this research are the students of class V in SD at Tomohon which define by random sampling 80 students are to be chosen the samples. The results of the research after controlling the students' previous ability indicate that: (1) the achievement of mathematics students who used the realistic mathematics education approach is higher than the instructional by conventional approach, (2) the achievement of mathematics who students' used assessment authentic of portfolio is higher than the result of the achievement mathematics learning by paper and pencil, (3) there is an interaction effect between instructional approach and assessment authentic toward the achievement of mathematics, (4) for groups students who used realistic mathematics education, the achievement of mathematics assessment portfolio is higher than the by paper and pencil, (5) for groups students' by paper and pencil, the achievement of mathematics used approach realistic mathematics education is lower than the approach conventional, (6) for groups students' by portfolio assessment, the achievement of mathematics using approach realistic mathematics education is higher than the approach conventional, and (7) for groups students who used conventional, the achievement of mathematics assessment portfolio is lower than the by paper and pencil, conventional.