This study aimed to develop the Factorisation and Algebraic Fractions Mobile-learning (FAM) module and test its effectiveness on Form Two students' achievement and interest in algebra. This study uses the design and development research (DDR) approach comprised of three phases, namely, (i) need analysis, (ii) design and development, and (iii) evaluation. The FAM module was developed using the ADDIE and Mobile Edu model. Meanwhile, to evaluate the effectiveness of the FAM module, a quasi-experimental design was used, specifically the pretest-posttest non-equivalent control group design involving 69 Form Two students from a secondary school in Kuala Lumpur chosen using a clustered random sampling technique. Data collected were analysed using descriptive statistics, namely mean and standard deviation. Meanwhile, inferential statistics, namely t-test, MANOVA, and Pearson correlation, were used for hypothesis testing. This finding shows that the FAM module has good validity based.....

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