The main aim of this study was to investigate the effect Algebra Tiles as manipulative tool on Form Four students_ overall achievement, conceptual knowledge, procedural knowledge and mental effort in learning the topic of Quadratic Equations. A quasi-experimental pre-post control design of a pre_post control group was conducted with Form Four students from a national secondary school in Shah Alam, Malaysia. Four classes were randomly assigned to either two classes the treatment group (n=60) and two classes the control group (n=60). The treatment group used the Algebra Tiles as teaching tool (PJA), while the control group underwent conventional teaching method (PK) for the topic of Quadratic Equations. There are two instruments used in this study: the Quadratic Equation Achievement Test (UPPK) and the Mental Effort Rating Scale (SPUM). Data was analyzed using descriptive analysis (mean and standard deviation) and inferential statistics through MANOVA. The findings of the study showed th.....

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