Development of Learning Tools Assisted by Lumio By Smart to Improve Mathematical Problem Solving Ability

This study aims to describe the process and results of the development of learning tools assisted by Lumio by SMART on flat building material to improve the mathematical problem solving skills of junior high school students in grade VII. At Sunan Kalijogo Junior High School, students’ ability to solve varied geometry problems is still low. Students tend to focus on the end result without understanding the solution strategy, so they are only able to solve the problems that are modelled by the teacher. This research uses the 4D development model. The validation results showed the device was very valid (score 3.71). The learning was well implemented, student activeness reached 93.6%, and student response was 90.71%. Classical completeness reached 89.4% with ability improvement in the moderate to high category. The independent sample t-test resulted in a significance of 0.000 (<0.05), showing a significant difference between the experimental and control classes. Thus, the device developed was declared valid, practical, and effective. The implementation of the device also increased the involvement and motivation of seventh grade students of Sunan Klijogo Junior High School, as well as creating a collaborative learning environment and supporting a significant increase in mathematical problem solving ability. This research can be a reference for the development of innovative learning, and is recommended to be applied to other materials to improve mathematical problem solving skills.