<![CDATA[This research aims to obtain a description of the use of mathematics in the activities of carpenters and masons in the process of building a house. The subjects of this research were two builders who were carrying out construction in the village of Tokala Atas. The two craftsmen chosen as research subjects consisted of a masons and a carpenter. The research method used was qualitative with a descriptive type of research carried out in the village of Tokala Atas. The data collection techniques used were observation and interviews. Observations were made while the builders were building the house. Interview techniques were used to explore the data that had been obtained when the observations were made. The results of the research show that carpenters and masons use mathematical concepts in building houses, namely the Pythagorean concept when forming foundation angles and measuring the sloping sides of roofs. The concept of alignment when measuring foundation bow plank strings, measuring brick laying benchmark strings and measuring frame heights. The concept of comparison is used when measuring into the foundation and when determining the distance between floor girders. The concept of flat construction is used when making sloping reinforcement frames, making piles and forming wooden joints. The concept of perpendicular lines is used when adjusting the straightness of poles, sills and roof posts. Arithmetic concepts are used when calculating zinc and teal requirements. The mathematical concepts contained in house buildings made by carpenters are roof shape: roof shape, rice wrapper and wall shape: betel stacking shape, plate stacking and lengthwise.]]>
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