Kahoot Applications has been one of the media of the learning process to be developed further. It can become media of the learning process as well as a tool for measuring/index of the target. These analyses observe the result of the learning process based on Kahoot Application towards the fifth grade of elementary students in the context of single and complexes theory. This kind of Media of learning process is more likely effective used in the argent situation of the Pandemic COVID 19 period that is inevitable for the mechanism of the learning process from home which should be supported by internet connection. This product is made by the learning development of ADDIE. The method of analysis used is the method of surveying. The Data taken from surveying uses a Likert scale from a score within 1 to 5. They are three expertise from material aspects and the media aspect, 5 teachers from the fifth grade of elementary from different schools, and is examined for 149 students from 5 different schools to examine the result. The result stated that Kahoot’s application as the media of the learning process is efficient and proper being used as a learning and teaching process because Kahoot applications allow enhancing students’ interest and motivations to be more likely focus to on learning process for the better result of learning mechanism.

Silver nanoparticles have been synthesized by reduction method using extract of Muntingia calabura L. leaf a bioreductor. The process of silver nanoparticles formation was monitored by UV-Vis method. The results showed that the absorbance values increased according to the increase of reaction time. Maximum absorption of silver nanoparticle was obtained at a wavelength of 41-421 nm. The size of silver nanoparticles was determined using a PSA (Particle Size Analyzer) with a particle size distribution of 97.04 nm. The functional groups compound that contribute in the synthesis was analyzed using Fourier Transform Infrared Spectroscopy (FTIR). Morphology of the silver nanoparticles was observed by an Scanning Electron Microscope instrument and the structure characterization of the compounds were analyzed using X-Ray Diffraction. The glucose nanosensor based on silver nanoparticles have the measurement range of 1 mM - 4 mM with the regretion (R2) is 0,9516, the detection limit of sensor is 3,2595 mM, the sensitivity of sensor is 2,0794 A. mM-1. mM-2.

Kemampuan pemahaman konsep perkalian pada dasarnya berasal dari konsep penjumlahan yang dilakukan secara berulang, namun pada prosesnya banyak ditemukan penerapan pembelajaran perkalian cenderung bersifat menghapal daripada memahami konsep perkalian itu sendiri. Hal tersebut banyak memunculkan stigma bahwa mengoperasikan operasi hitung perkalian lebih sulit daripada operasi hitung lainnya. Penelitian ini merupakan penelitian deskriptif dengan pendekatan kualitatif yang bertujuan untuk mendeskripsikan kemampuan pemahaman konsep perkalian peserta didik pada pembelajaran matematika. Subjek penelitian adalah peserta didik kelas IV-D SD Negeri Lenteng Agung 07. Penentuan subjek dilakukan dengan teknik purposive sampling dengan sampel sebanyak 26 peserta didik kemudian 3 peserta didik terpilih akan dilakukan wawancara. Teknik analisis data pada penelitian ini yaitu menggunakan lembar tes peserta didik yang berkaitan dengan pemahaman konsep perkalian dan materi bangun datar siswa sekolah dasar, kemudian wawancara dilakukan kepada 3 peserta didik dan guru kelas IV. Uji keabsahan data menggunakan triangulasi teknik melalui tes tertulis dan wawancara. Hasil penelitian menunjukkan kemampuan pemahaman konsep perkalian pada pembelajaran matematika peserta didik masih tergolong rendah. Pada saat proses wawancara dilakukan peserta didik tidak mampu menjawab pertanyaan yang diajukan peneliti dengan tepat. Pertanyaan yang diajukan sesuai dengan indikator soal yang telah ditetapkan yaitu (1) kemampuan memanfaatkan dan memilih prosedur yang sesuai dengan kaidah operasi hitung perkalian (2) kemampuan konsep perkalian untuk menyelesaikan permasalahan yang diberikan dan kemampuan menggunakan syarat perlu atau syarat cukup pada permasalahan yang diberikan.

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