The Development of Mathematical Problem-Solving Ability Using the DAPIC Problem-Solving Process Integrated with Applications on Linear Equations in One Variable for Grade 7 Students

Abstract

This research aimed to: 1) examine the quality and appropriateness of lesson plans for Grade 7 students, and 2) compare the mathematical problem-solving ability of Grade 7 students before and after instruction based on the DAPIC problem-solving process integrated with applications. The participants consisted of seven Grade 7 students from the Demonstration School of Roi Et Rajabhat University during the second semester of the 2025 academic year. The research instruments included: 1) lesson plans on linear equations in one variable developed according to the DAPIC problem-solving process integrated with applications for Grade 7 students, and 2) a mathematical problem-solving ability test. The results indicated that: 1) the lesson plans were rated at the highest level of appropriateness (x̄ = 4.53), and 2) the Grade 7 students who received instruction based on the DAPIC problem-solving process integrated with applications demonstrated a significantly higher mean score in mathematical problem-solving ability after the instruction than before the instruction, at the .05 level of statistical significance.