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Multihundred Blocks KiT 2.0 was born when there were still students who had not mastered the basic concepts of whole numbers, basic operations within 100 and converting the simplest fractions well. Therefore, the objective of the Multihundred Blocks Kit is to help improve the mastery of basic operations skills and converting the simplest fractions more clearly and meaningfully. The Multihundred Blocks Kit is improved from the use of the 100 Square which has been built from a wooden frame and mini wooden blocks to the Openspace 3D digital application. The Multihundred Blocks have surfaces numbered 1 to 100 and surfaces numbered multiples of 1 to multiples of 10 with different functions. The Multihundred Blocks numbered 1 to 100 can be used to solve mathematical sentences of addition, subtraction and combination operations within 100 as well as identify prime numbers and composite numbers more clearly and easily, while the Multihundred Blocks numbered multiples of 1 to multiples of 10 are used to identify equivalent fractions and convert the simplest fractions. The Multihundred Blocks Kit contains a mini Multihundred Blocks, a QR code card for the Multihundred Blocks application and interactive games, question cards and four game boards that can be accessed anywhere along with a user manual as a user guide. The Multihundred Blocks application has been improved by providing 5 additional buttons, namely mental arithmetic and Let's explore which contains 4 common form boards for the calculation methods of addition, subtraction, multiplication and division interactively. There are four phases of innovation methodology: evaluation and question and answer sessions with teachers and students, discussing ideas with fellow teachers, creating prototypes and finally testing and trial runs to get feedback from users. This product has been proven to help students master basic number skills within 100 and fractions well because it is flexible, portable and very functional as a teaching material and resource that meets the elements of 21st century learning.