<![CDATA[AbstractThis research aim to know the effect of applying cooperative learning model by student team achievement method toward  student’s learning result on  expansion in 7th grade of SMP N 22 Pontianak. The research method is quasi experimental design with the nonequivalent control group design . the sample determined by intact group method ang obtained VII B class which has 30 student as Experiment class and VII D class which also has 30 student as control class. The average score of experiment class (56,51) and control class (24,90). Based on U-Man Whitney test ,the significant value is 0,00<0,05 , then Ha accepted. There are differences between the student who learn using STAD than who student teached by conventional teaching method. The value of effect size is 1.24 which indicate that STAD method was effective applied on expansion matter 7th grade of SMP N 22 Pontianak.  Keyword: Cooperative Learning by STAD, Learning Resul]]>
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