| Summary: | To collect information about teachers concerning mathematical knowledge for teaching and find out what needs to be considered in developing a curriculum to teach it, the current study surveyed 137 secondary teachers and interviewed thirteen of them in Korea. The survey and interviews used the assessment of mathematical knowledge for teaching about algebra I, which was developed as part of the Measures of Effective Teaching project. The correct response rate of Korean teachers was very high, but there were some differences found in the areas of algebraic reasoning. Furthermore, mathematical analysis is important in assessing students' algebraic reasoning, and each teacher's typical teaching method is formidable in evaluating students' reasoning. Implication is discussed for the improvement of teachers' mathematical knowledge for teaching algebra.
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