The purpose of this exploratory mixed-methods research is to develop and validate an instrument for the factors that impact the Mathematics teacher_s acceptance of using the Mathematics Mobile Applications (MMA) and to identify the Mathematics teacher_s acceptance level of using the MMA. The constructs and items of the instrument were developed through a literature review and an interview session. Six constructs, namely Performance Expectancy (PE), Effort Expectancy (EE), Social Influence (SI), Facilitating Conditions (FC), Self-Motivation (SM), and Students Engagement (SE), were discovered. The face validity and content validity of the instrument were validated by three and nine experts, respectively. 552 secondary school teachers from Perak participated in this survey using the MMA instrument. The survey data were analyzed using Rasch analysis and SPSS 29. The findings indicated that all the items developed were within the infit and outfit MNSQ of PSA of 0.63 to 1.40 logits. In terms.....

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