Abstract: Purpose of this study is to determine the effect of learning approach Concept-Rich Instruction to the ability of mathematical understanding in terms of math anxiety of elementary school students. The study was conducted in SD Negeri 1 Sindang kasih with a sample of third-grade students A and III B 45 people an experimental class and class III C and III D with a sample of 45 students as a control class conducted in the academic year 2017/2018. Research using treatment by level 2 x 2. Data analysis technique is a two-lane variance analysis (ANOVA).