摘要：The purpose of this study are (1) to find out the mastery learning achievement of students mathematical communication ability in Guided Discoverylearning assisted by educational props,(2) know the improvement of mathematical communication ability in Guided Discoverylearning assisted by educational props (3) describe students mathematical communication ability for each category curiousity in Guided Discoverylearning assisted by educational props.This research method is mixed methodswith sequential explanatory design.The population in this study were all students of class VII SMP N 33 Semarang in 2019/2020,sampling was done by random samplingselected to be a sample is class VII-F.The research subjects were taken by using purposive samplingtechnique.The research subjects consisted of 9 students.Subjects were interviewed based on mathematical communication ability test results.The results showed that (1) students mathematical communication ability in Guided Discoverylearning assisted by educational props reached mastery learning,with an average grade reaching 80 and classical completeness exceeding 75%,(2) there was an increase in students' mathematical communication ability in Guided Discoverylearning assisted by educational props.Improved mathematical communication ability are medium.(3) Subjects with high curiosity have 4 indicators of mathematical communication ability,subjects withcuriosity have 3 indicators of mathematical communication ability,subjects with low curiosity are only have 2 indicators of mathematical communication ability.
