“…Overall the difference in average and angain in the FD and FI group can be seen in Figure 3 below: The following table is the result of the achievement analysis of the cognitive style level of independent and dependent fields in solving algebraic problems based on the categories of mathematical reasoning indicators in general: Based on the data presented in table 8, the level of students mathematics reasoning ability in the FD group are 2 students (7,14%) in not capable category (level 0), 9 students (32,14%) are in the less capable category (level 1), 8 students (28,57%) are in the capable enough category (level 2), 5 students (17,86%) are in the capable category, and 4 students (14,29%) are in the very capable category. This is following the opinion of Tohir et al that the thinking ability in identifying and constructing formulas in mathematics is needed to foster students' understanding to the material and produce meaningful learning (Tohir & Muhasshanah, 2021;Tohir, Maswar, Atikurrahman, Saiful, & Rizki Pradita, 2020;Tohir, Abidin, Dafik, & Hobri, 2018). The result of this study has strengthened the result of the research conducted by Mirlanda & Pujiastuti that by knowing the different types of students 'cognitive styles and their characteristics, mathematics learning activities must be designed in such a way to foster and develop student's mathematics reasoning ability (Mirlanda & Pujiastuti, 2018).…”