This study aims to develop and determine the effectiveness of Bar Model Fraction Kit based on students’ achievement in answering Higher Order Thinking skills (HOTS) word problems. In order to enhance the validity of the instrument, four experts had reviewed the instrument. The Cohen kappa value is 0.75. This indicates a “good” extent of agreement. There were 15 students involved in the pilot test. The students used the Bar Model Fraction Kit to answer the test items. From the analysis, it was found that the Cronbach alpha coefficient value is 0.765. This shows that the Bar Model Fraction Kit has acceptable reliability. A total of 48 Year 5 students from Batang Padang District, Perak were involved in a quasi-experiment using pre-test and post-test. The students were divided into a control group and a treatment group. The control group (n=23) used the teaching and learning process (T&L) with conventional method, while the treatment group (n=25) used the T&L using the Bar Model Frac.....

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