An elementary school is a place for students to get basic concepts of knowledge used as a bridge of thinking to solve various problems in life. Mathematics is a learning that contains abstract concepts of space and numbers. Through mathematics learning, students are invited to think logically, understand mathematical concepts, reasoning patterns and attitudes, explain mathematical statements, communicate mathematical symbols, and have curiosity, attention, and interest in learning mathematics, which are expected to help them solve everyday problems. Interactive multimedia is one of the media that can be used in delivering learning materials to students. This study aimed to determine the effectiveness of interactive multimedia-based learning media using PowerPoint in influencing the understanding of mathematical concepts. The population of this research is the third-grade students of Cluster I, Pondok Labu Village. Samples were taken using the Slovin formula to get 30 samples. This study uses an experimental research method using a pre-experimental design with a one-group pretest-posttest technique. The research data were obtained through multiple-choice tests on simple fractions. The data collected were analyzed through a t-test. The results showed an influence on understanding students' mathematical concepts who participated in learning with multimedia-based interactive learning media using PowerPoint. Students get an increase in test results before and after using PowerPoint. In addition, there is a positive influence, namely that learning becomes much more fun, makes it easier for students to understand the material, and affects students' activeness in education. So, this learning model is a breakthrough in today's era. © 2025 American Institute of Physics Inc.. All rights reserved.