Analysis also shows that based on mathematic reasoning skills, from 225 problems there were only 8 problems haven’t fulfilled the mathematic reasoning skills with 3,56% presentation number. The analysis result tells that from 225 problems analyzed there were 76 problems fulfilled the indicator 1, 110 problems fulfilled the indicator 2, 30 problems fulfilled the indicator 3 and 183 problems fulfilled the indicator 4. Problems analysis guide was based on mathematic reasoning skills indicator according to NCTM. Documentation method was used as data collection method. The method used were descriptive qualitative, with Competency Test’s problems in 2013 Curriculum text book revised in 2014 for 1 th grade used for research subjects. Hence, it is necessary to understand completely do the widely used mathematic textbook has led students to increase their mathematic reasoning skills. But in real life, teachers usually use textbook to measure how much do their students understand materials taught by the teachers. P>The process of reasoning has a very strong connection with mathematic world, especially on problem solving skills.
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March 2023
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