<![CDATA[The purpose of this study was to determine the effect of the use of learning mathematics Android-based media to the critical thinking skills of students. Matematika is one of the basic science that has a very important role in the effort to the field of science and technology. More added math may prepare students to apply mathematics that are needed in everyday use. This type of research quasi-experimentalresearch design Nonequivalent Control Group Design. The population in this study were all fourth grade learners Al-Azhar Bukittinggi. The sampling technique is done by using purposive sampling, so the class was selected as the control class IVA and IVB class as a class experiment. Before determining the samples, then tested using the analysis prerequisite test for normality and homogeneity. Instruments used in the form of objective tests.Based on the results of data analysis calculations t-test with a level of 0.05 was obtained signifikasn t (2,51) and ttable (2.10). So that t> t table, where 2.51> 2.10. Thus it can be concluded that Ha is received, which is containedthe effect of the use of learning mathematics Android-based media to the critical thinking ability of students learning in fourth grade Denomination Al-Azhar Bukittinggi. ]]>
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