{"content":[{"text":"American Journal of Engineering Research (AJER)","bbox":{"left":0.120959,"top":0.066906,"width":0.5066419999999999,"height":0.021428000000000003}},{"text":"2021","bbox":{"left":0.820956,"top":0.066906,"width":0.04675499999999999,"height":0.021428000000000003}},{"text":"many children, both at an early age and school age who lose learning time because they are too busy with the \n world of technology such as playing games, playing mobile phones, and playing computers. \n So, in addition to developing learning tools using the RME model, researchers also need to look for \n learning media that can improve problem solving abilities and student learning independence. From the \n observations of researchers, the Yapim Taruna Marelan High School teacher has not used computer technology- \n based media in the software-assisted mathematics learning process, due to the lack of understanding of teachers \n in using technology, especially teachers in the field of Mathematics studies. \n Visual thinking is an abstract thought into a scientific form of thinking and is a cognitive bridge \n between verbal thinking and practical activities between words and activities (Zhukovzky, 2018: 150). \n Visualization (Visual Thinking Skill) according to Yin (in Surya, 2011: 5) identifies the important role of \n visualization (visual thinking), among others: to understand problems, simplify problems, see problems into \n related connections, meet individual learning styles, as a substitute for calculations , as a tool for checking \n answers, and for converting problems into mathematical forms. \n According to Surya (2010: 5), visualization is the core of mathematical problem solving, and can be a \n powerful cognitive tool in solving mathematical problems. This is characterized as an important skill in learning \n and applying mathematics. Visualization has an important role in developing mathematical thinking and \n understanding and in the transition from concrete to abstract thinking related to problem solving (Lavy, 2016: \n 25-32). For this reason, students are expected to have visual thinking skills and independent learning. \n NCTM (2000) stipulates that there are 5 standard processes that must be mastered by students through \n learning mathematics, namely: (1) problem solving; (2) Reasoning and proof; (3) Communication; (4) \n Connection; and (5) Representation. The five process standards are known as Mathematical Power, namely the \n ability to solve problems, both in mathematics and problems in real life. \n Today, teachers and educators are required to master computers and the internet, because in the 2013 \n curriculum all subjects must be based on Information and Communication Technology (ICT). Syamsyah \n (2019:81) states that the learning process in the 2013 curriculum requires students to actively participate and \n provide sufficient space for students' creativity, interests, and talents. Technology has also become the main \n focus in the 2013 curriculum, this is contained in Permendikbud No. 65 About Process Standards. Learning \n using ICT can increase the attractiveness and attention of students, because learning will be more interesting and \n meaningful. Students can directly interact and more easily see the evidence of what the teacher said. In addition, \n learning using ICT will be more efficient in the use of time. With the principle of optimal, effective and efficient \n use of ICT, it will attract and stimulate students' creativity. Learning mathematics using computer technology- \n based media is very good if we support it with mathematical software that will greatly assist students in working \n on or analyzing existing problems. \n As technology develops, there are many ICTs that can be used in learning mathematics, for example \n digital book software (Flip PDF Professional) is an application used to make e-modules attractive, containing \n text, images, animation, practice questions, audio and video. \n Learning with Flip PDF Professional can accommodate students who are slow to receive lessons, \n because it can provide an effective climate in a more individual way, never forget, never get bored, can \n stimulate students to do exercises. In addition, the use of Flip PDF Professional as a learning medium can make \n it easier for teachers to deliver material, make it easier for students to absorb what the teacher says, and \n simulations occur because of the availability of animation and manipulation movements (dragging) that can \n provide a clearer visual experience for students. . \n Based on the description above, the researchers tried to combine the Realistic Mathematics Education \n (RME) model with computer technology media (Flip PDF Professional), to improve visual thinking skills.","bbox":{"left":0.120959,"top":0.099731,"width":0.7588829999999999,"height":0.603379}},{"text":"II. METHODS \n Research Pattern \n This type of research is development research using the learning device development model of Thiagarajan, et \n al, namely the 4-D model (define, design, develop, desseminate). \n Subjek","bbox":{"left":0.120959,"top":0.714847,"width":0.75808,"height":0.07252899999999995}},{"text":"The subjects in this study were several students of grade 11 MIA-1 Yapim Taruna Marelan High School which \n amounted to 20 people in trial 1 and students of grade 11 MIA-2 Yapim Taruna Marelan High School which \n also amounted to 20 people in trial II.","bbox":{"left":0.120959,"top":0.797767,"width":0.758415,"height":0.04333699999999996}},{"text":"Research Procedure \n This research is divided into two stages. The first stage is the development of digital learning tools \n using realistic mathematics education assisted by digital books. Development of learning tools includes the \n design of learning devices.","bbox":{"left":0.120959,"top":0.852927,"width":0.758126,"height":0.05662299999999998}},{"text":"w w w . a j e r . o r g","bbox":{"left":0.129021,"top":0.924305,"width":0.157356,"height":0.01749299999999998}},{"text":"Page 68","bbox":{"left":0.816522,"top":0.924875,"width":0.058898000000000006,"height":0.01749299999999998}}],"images_bbox":[],"images_bbox_not_text_overlap":[]}