ANNIBUKU: INTERACTIVE E-BOOK TO MEASURE PROBLEM-SOLVING ABILITY IN THE DIGITAL ERA

: Problem-solving abilities are one of the most important abilities for a person to have at this time, especially those that can be used to solve mathematical problems related to everyday life. Interactive teaching materials are essential to build these problem-solving skills. E-books are the main learning medium in today's digital era. Annibuku is one of the E-books for all subjects that can be uploaded onto digital applications via mobile phones and PCs. The purpose of this study is to describe how Annibuku can measure students' problem-solving abilities in mathematics and students' responses to the use of Annibuku EBooks. The research method used is an analysis of the Annibuku E-book literature study and direct observation to determine the student responses to using Annibuku in mathematics. The research subjects in this study were 30 students in the tenth grade at SKB Cimahi City. The result of this research is that the problem presentation in Annibuku EBooks is interactive and can hone students' mathematical problem-solving skills.


INTRODUCTION
The purpose of learning, of course, is to achieve an ability that someone wants and that can be useful for everyday life. The ability to solve problems in the current era is certainly a person's main ability to be able to continue to adapt along with the changing times. Solving the problem studied here is the ability to solve mathematical problems. In mathematics, the term "problem solving" refers to the tasks given to students to improve their mathematical understanding and ability. Cai & Leister (Albay, 2019) mention that problem solving can help students develop their mathematical concept understanding, connection, and communication skills. Meanwhile, Bayat & Tarmizi (2010) state that problem solving can improve students' cognitive abilities. Problem solving is also known to be part of the mathematics curriculum, which is considered very important because, through the experience gained by students, they are judged to be able to use the knowledge and skills they already have to be applied in problem solving (Nopela, 2021).
Students' problem-solving abilities in learning, of course, must be supported by existing learning facilities and media. One of the characteristics of good learning media to build problem-solving skills is interactive media and teaching materials. It is very important to develop interactive teaching materials that are good for use in classroom learning or can be made independently without a teacher or tutor (Artista, 2018). Currently, we have entered the digital era, where all of our activities are highly dependent on digital devices. One of the activities that have been using digital devices a lot is activities in the learning process in the classroom. There are so many digital platforms and applications that can make it easier to become a source and learning tool. One's main medium for learning is books. Therefore, we need an electronic textbook or e-book that contains activities on concepts that are in accordance with today's learning objectives and stimulate these abilities (Mella et al., 182 2022). Activities in the E-book based on problem solving will be filled with real problems that are adapted to Polya's problem solving steps (in Nugraha et al., 2022). Many electronic books, or E-Books, have been made and are an example of information technology that has a function to benefit the students in learning (Hariawan & Sakti, 2021). E-Books are made to make it easier for readers and learners to get reading resources on their respective digital devices. PCs and some cellular phones can also be used to read e-books (Liana et al., 2021). Making an interactive E-Book entails several steps, including (1) setting goals; (2) preparing interactive E-Book content and materials; (3) online services and websites for preparing interactive E-Books; (4) ebook creators and editors for building interactive ebooks; and (5) publishing and distributing interactive eBooks (Ulty, 2020). Annibuku is a digital platform in the form of a collection of electronic books on subjects from elementary school, junior high school, and high school. Annibuku can also be uploaded on their respective cell phones and PCs so that it can make it easier for students to access and get books as reading resources for them to study. Based on the explanation above, the researcher really wants to know how Annibuku can measure students' problem-solving abilities in mathematics subjects. Besides that, researchers also want to know firsthand how students respond to Annibuku's E-Book.

METHOD
This research method is an analysis of literature studies on Annibuku's E-Book in the tenth grade Mathematics subject. The researchers examine the content of Annibuku's book in relation to the components contained in the book, the content of mathematics material, and the interactivity of the E-Book in developing students' problem-solving abilities. After collecting and analyzing the literature study, the researchers also observe directly the tenth graders at SKB Cimahi City as many as 30 people to figure out directly the conditions of using the Annibuku E-Book as well as student responses to the Annibuku E-Book by using a questionnaire survey technique via Google forms.

RESULTS & DISCUSSION
The author here analyses the literature study of Annibuku's electronic book on the tenth grade mathematics subject. Annibuku can be found through its website, namely annibuku.com, or can be downloaded individually on mobile devices. Here's what the Annibuku app looks like on the Android App Store and on its website: The author reviews the components of the teaching materials in the Annibuku E-Book in terms of the content contained in it, especially on the system of equations and linear inequalities. The presentation of the material in this e-book is very problem-solving based, where every concept development of the material in it begins with a contextual problem, and there are questions that can build students' ability to solve the problem. Solving the problems described is done step by step clearly, so that students can comprehend the problem first, followed by planning, solving problems according to plan, and re-evaluating the answers that have been done. This is in accordance with the problem solving steps based on Polya, namely: (1) understanding the problem; (2) developing a strategy or plan for the settlement; (3) resolving the problem according to the plan made; and (4) re-examine the answers (Sutarto, 2014). However, in Annibuku, the process of re-examining answers is not very clear and is only about strengthening solutions in solving problems. Meanwhile, the advantage of Annibuku's e-book is that there are challenges that can hone mathematical thinking at a higher level. The following is an example of how Annibuku displays its problemsolving-based material:  Figure 3. Display of contextual problems on Annibuku The author then makes direct observations to determine student responses to the use of Annibuku E-Book application in learning mathematics at the tenth grade SKB Cimahi City. Based on the results of observations and surveys that have been carried out, students respond to the use of Annibuku's E-Book in mathematics as a very practical step, and it makes them motivated to solve the math problems available in the electronic book. Based on the results of a survey via Google form, about 86.67% of the 30 students feel challenged to work on the questions contained in the Annibuku. Their responses are more confident, and they feel helped by the existence of electronic books that can be accessed on their respective mobile phone applications. The following is a photo of the field observation activity using Annibuku at SKB Cimahi City:  Figure 4. Photos of Observation Activities on the Use of Annibuku at SKB Cimahi Based on the observation experience that has been done, Annibuku's E-Book is very effective in being used as a teaching material in the classroom. Practical use also facilitates the learning process to take place well. The obstacles found are only related to the technical condition of the internet package and the cell phone memory owned by each student, but this is only experienced by a few students and could be solved by deleting some data and buying a quota package again to support internet use.

CONCLUSION
The conclusion obtained from the results of the analysis of studies and direct observations by the author is that the Annibuku E-Book is an interactive and problemsolving-based electronic teaching material. It can support the improvement of problemsolving skills, especially students' mathematical problem solving. Student responses to the use of Annibuku's E-Book also strongly agree to make them motivated in solving the available math problems and help them in finding ways to solve math problems.