<![CDATA[This study was being underlied by Mathematics learning outcomes of the second grade of SDN Gugus Gajah Mada which is low. This study was intended to know the effectiveness of STAD model based from van hiele theory towards mathematics subject learning achievement of the 2nd grade students of Elementary Schools (SD) Cluster Gajah Mada Wonogiri. To achieve this objective, this research used quasi experimental research with the type of nonequivalent control group design. The subjects of this study were the 2nd grade students of SD Cluster Gajah Mada Wonogiri. They were sampled by using cluster random sampling. As the data were collected, they were analyzed by using one tailed proportion test, namely z test, t test, gain test and N -gain. The t test shows the comparison of count = 2.98>ttable = 1,68 which meant that Ho is reject, while Ha is accept. The results showed that the mathematics learning achievement of the 2nd grade students of SD Cluster Gajah Mda Wonogiri who achieved the treatment of STAD model based from van hiele theory achieved the passing grade (KKM) score, and STAD model based from van hiele theory than TPS.]]>
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