Development of Diagnostic Tests in Learning Mathematics on the Topic of Two-Dimensional Geometric Figure for Grade 6 Students under the Yasothon Primary Educational Service Area Office

Abstract

This research aimed to create and evaluate the quality of a mathematics diagnostic test, diagnose mathematics learning, and study methods to address learning deficiencies on the topic of two-dimensional geometric figures for grade 6 students under the Yasothon Primary Educational Service Area Office 1. The sample consisted of 431 sixth-grade students, randomly selected.

The research findings were as follows:

1. The quality of the diagnostic test was analyzed using Item Response Theory, which showed the discrimination ranged from 0.29 to 2.43, the difficulty ranged from -0.79 to 2.22, and the guessing ranged from 0.00 to 0.30. The item information function values ranged from 0.00 to 0.81, and the highest test information was for students with an ability level θ = 0.87.

2. In diagnosing learning deficiencies, it was found that the most common disabilities were in problem-solving involving triangles and circles, the area of circles, triangles, and quadrilaterals.

3. Methods to address these learning deficiencies included checking students’ prior knowledge and reviewing prior content learning experience to prepare students, promoting problem analysis and memorization of formulas, explaining the origins of formulas, practicing exercises, reviewing mathematical operations, especially multiplication and division, and incorporating real-life situations and the students’ surrounding environment into the lessons.