The reserarch aims at finding out the effectiveness of word terrarium media towards cognitive development of childern age 4-5 years old of tk islam al huda manyaran wonogiri in the academic year of 2019/2020.based on the result of analyzing statistical data through SPPS 21.00 version with paired sample t test formula, it is obtained thet sig is 0,000<0,05 wich means Hois rejected and Ha Is accepted. thus the hypotesis taht asked of the differernce of social cognitive aspect before and after using world terrarium media been accepted. the result of N Gain is 0,84 between 0,71 1,00 sehingga dapat disimpulkan bahwa penggunaan media terrarium terhadap perkembangan kognitif anak usia 4-5 tahun efektif dalam kategori tinggiKata Kunci : Efektivitas, Media Terrariu Dunia, Pengembangan Kognitif
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