This study aims to investigate the effectiveness of using TI-Nspire CX graphing calculator’s approach in learning Integrals and Its Application topic towards pre-service mathematics teachers’ achievement and mathematical reasoning. In addition, the study also determine the relationship that exists between the two dependent variables. The sample consist of 44 pre-service mathematics teachers selected using the fish-bowl method to take part in this quasi-experimental non-equivalent pre-post-test design study. A total of 22 pre-service mathematics teachers are participate in each experimental group and control group. The instruments used for the pre and post-test were the Calculus Achievement Test and Calculus Mathematical Reasoning Test to measure the pre-service mathematics teachers’ level of achievement and mathematical reasoning skill. The obtained data were analysed quantitatively using the inferential statistics, namely paired sample t-test, one-way MANOVA and Pears.....

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