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The innovative idea for the Multihundred Blocks Kit emerged when it was observed that some students had not yet mastered the basic concepts of whole numbers, basic operations within the range of 100, and converting simplest fractions well. Therefore, the objective of the Multihundred Blocks Kit is to help improve the mastery of basic operation skills and converting simplest fractions more clearly and meaningfully. The Multihundred Blocks Kit is an enhancement of the use of the 100 grid, transitioning from a frame and mini wooden blocks to a digital application in Openspace 3D. The Multihundred Blocks have surfaces numbered 1 to 100 and surfaces numbered multiples of 1 up to multiples of 10, each with different functions. The Multihundred Blocks numbered 1 to 100 can be used to solve math sentences involving addition, subtraction, and combined operations within the range of 100, as well as to identify prime numbers and composite numbers more clearly and easily. Meanwhile, the Multihundred Blocks numbered multiples of 1 to 10 are used to identify equivalent fractions and convert simplest fractions. The Multihundred Blocks Kit contains a Mini Multihundred Blocks, QR code cards for the application and interactive games, question cards, and 5 game boards that can be accessed anywhere along with a user manual as a guide. There are 4 phases in the innovation methodology: evaluation and Q&A sessions with teachers and students, discussing ideas with fellow teachers, creating a prototype, and finally, trial testing to get feedback from users. This product has proven to help students master basic number and fraction skills within the range of 100 well because it is flexible, portable, and highly functional as a teaching material and resource that meets the elements of 21st-century learning.