The purpose of this reasearch is to analyze effect of applying realistics mathematics approach to matter determines the LCM and HCF for learning outcomes of fourth grade in SDN 68 Pontianak Barat. Research methods that used is experimental method with Quasi Experimental Design, with Nonequivalent Control Group Design. Research population is all of fourth grade of five classes from class IV A to class IV E with total 207 students. The sample of this research are class IV A consist of 43 students (experiment) and class IV D consist of 42 students (control). The average learning outcomes of final test class IV A is 79,73 and class IV D is 65,71 gained tarithmetic (4,2441)>ttable α=5% (1,67), then Ha acceptable. So, the conclution is there are two average significant differences learning outcomes of students, among students group that teach with apply strategy of expository and students group that teach with apply realistics mathematics approach of fourth grade in SDN 68 Pontianak Barat. The value of effect size is 0,95 with high criteria, this case mean applying realistics mathematics approach to matter determines the LCM and HCF give high effect for learning outcomes of fourth grade in SDN 68 Pontianak Barat.
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