This research was conducted to determine the effect of aptitude-treatment interaction (ATI) instructional models with task and forced instructional strategy to mathematical reasoning abilities. Mathematical reasoning ability is an ability that belongs to the goals of national education, but its achievement is still fairly low. The method used in this study is a quasi-experimental method with a posttest-only research design. Sampling in this study using purposive sampling technique. The study sample consisted of 60 students divided into two classes (30 experimental classes and 30 control classes). This research was conducted in the school of SMK Perintis 1 Depok and SMK Fajar Depok. The experimental class uses aptitude-treatment interaction (ATI) learning model with task and forced learning strategies, while the control class uses conventional methods. The collected data is then analyzed using the calculation of chi-square test, Fisher test, and hypothesis testing. The results of the data analysis showed that the average value of students who learned using aptitude-treatment interaction (ATI) learning model with task and forced learning strategies was higher than the average value of students who learned using conventional methods. Based on the results of hypothesis testing shows that there is an influence of aptitude-treatment interaction (ATI) learning model with task learning strategies and forced on students' mathematical reasoning abilities.
Padat penebaran yang berbeda pada media pemeliharaan dapat mempengaruhi kebugaran, sehingga dapat mempengaruhi pertumbuhan dan kelangsungan hidup benih ikan mas. Permasalahan yang berhubungan dengan padat penebaran benih ikan mas, dapat diminimalisir dengan sistem pemeliharaan benih ikan yang terintegrasi dengan tanaman biofilter. Tujuan penelitian ini adalah untuk mengevaluasi padat penebaran yang optimal untuk meningkatkan pertumbuhan dan kelangsungan hidup benih ikan mas yang dipelihara pada media sistem biofilter. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) dimana sebanyak 195 ekor benih ikan mas berukuran 2-3 cm, digunakan pada media biofilter jenis berisi air 30 L. Setiap wadah diisi dengan tingkat padat penebaran yang berbeda, dimana perlakuan A, B, C dan D berturut-turut kepadatannya 10 ekor/30L air, 15 ekor/30L air, 20 ekor/30L air, dan 25 ekor/30L. Setiap perlakuan terdiri 3 kali ulangan, sehingga terdapat 12 unit percobaan. Evaluasi pertumbuhan bobot mutlak, kelangsungan hidup dan panjang tanaman kangkung tidak berbeda nyata antar perlakuan (>0.05), sedangkan pertambahan panjang mutlak berbeda nyata antar perlakuan (<0.05). Perlakuan D menunjukan nila tertinggi pada pertumbuhan bobot mutlak (0.31 g), petambahan panjang mutlak (2.40 cm), dan kelangsungan hidup (81.33 %). Nilai tertinggi pada panjang tanaman kangkung ditemui pada perlakuan B (55.33 cm). Parameter kualitas air berada pada kisaran yang layak sebagai media hidup benih ikan mas. Hasil penelitian menunjukan penggunaan tanaman kangkung sebagai biofilter pada media hidup benih ikan mas mendukung performa pertumbuhan dan kelangsungan hidup benih ikan mas.
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