As the 2015 revised math curriculum was applied, this study was designed to find out which mathematical competences that could be reflected more appropriately by the content areas, as one of the ways to reflect the intent of the school curriculum more actively in the educational field. To this end, experts in math education were required to select appropriate mathematical competences based on achievement criteria and we summarized them by content area. In addition, analysis was conducted on the unit assessment items in math textbooks for the first grade of middle school and high school. The opinions of experts and the results of item analysis were almost identical, and for the first grade of middle school, it showed that the appropriate competences are; problem solving and reasoning in numbers and operations, problem solving and communication in variables and expressions, problem solving and communication in function, information processing in geometry, and probability and statistics. For high school mathematics, the study findings identified reasoning in number and operation, reasoning in function, solving problems in geometry, and solving problems in probability and statistics as appropriate competences. It was discussed what achievement standards go against expert opinion and reviewed what competence was feasible and what’s not for further development in item development. In addition, the mathematical competences were analyzed by sub-component to specifically explore the specific meaning of the competences and the feasibility of implementation by content area. It suggested that math teachers in charge of implementing curriculum competences should be given more detailed information to reflect mathematical competences, and that evaluation frameworks that reflect mathematical competences should be proposed in terms of evaluation.