Perkembangan Kognitif Remaja melalui beberapa tahapan. Kognitif dalam konteks ilmu psikologi sering didefenisikan secara luas mengenai kemampuan berpikir dan mengamati, suatu perilaku yang mengakibatkan seseorang memperoleh pengertian atau yang.
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Abstract This research aim to explain the Piaget's stage of cognitive development in logical operations are assessed according to the level of math skills in grade IX SMP Negeri 11 Pontianak. The method used is descriptive research with case studies. The subject consist of 30 students.