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Abstract This research was a stem-based didactic research which was conducted on sixth grade students. This didactic design was arranged in mathematics learning by using mathematic skills on the concept of integer count operations, comparisons, and measurements. While using the simple aircraft on science subject. Stem (science, technology, engineering, and mathematics) was used in didactic design to create a didactic situation that aimed students to build a simple plane where the students used their mathematic skills. The goal of this research was to improve 21st century skills, including; critical thinking, creative thinking, problem solving, communicating and network building. Didactic design was a learning program that contained a didactic situation, hyphotetical learning trajectory, students response, and anticipation of students response. This research was conducted on three didactic designs. In the first design, students planed problem solving by designing a simple tool based on provided materials, the needs and the lowest price. In this process students used the concept of integer count and measurement operations. In the second didactic design, students constructed a simple tool and examined it in several situations, then calculated the advantages and disadvantages. In the third didactic design, students designed a larger tool based on a proven model where in the process students used the comparison concept. The first didactic design, which was implemented then was revised based on the findings in the learning process. Based on the observation and analysis of learning result, this didactic design could improve students skills on critical thinking and creative thinking. Students could solve the problem during learning process where the students worked together and communicated. Students could also use their mathematic skills in solving problems in a social context.