Abstract
It is acknowledged that elementary school students' thinking skills are within the concrete operation. As a result, teaching of geometrical concepts must be in line with their way of thinking in which students are faced with suitable physical manipulation of concrete objects. Building concepts through seeing and doing are far more effective than just listening. The concept of area is an abstract concept, so if it is presented in a concrete form, students will find it easier to understand what is being learned. Proper use of media or teaching aids could make an effective learning. The problems covered in this paper are: (1) there is no teaching aids accompanied with instructions for teaching the area of triangle and kite formulas; and (2) whether the use of teaching aids accompanied with instructions is consistent in developing the formulas for the area of triangles and kites. Therefore, the purpose of this study are: (1) to develop teaching aids accompanied with instructions for the area of triangle and kite formulas; and (2) to determine the consistency of the use of teaching aids accompanied with instructions for developing a formula for the area of triangle and kite. Two types of teaching aids accompanied with instructions dealing with the areas of the triangle and the kite have been developed. Three experts and six practitioners validated those teaching media and concluded them ready for use. In addition, after having been tried out, those teaching aids showed the effective and consistent results. This is indicated by the average scores obtained by two classes (A and B) involved, namely 81.13 and 82.06 respectively. The average scores were categorized into very high which have never been achieved before. Besides, the value of | |(. ) < t table (2.042) obtained indicated that there is no significant difference in the significant level of 5% between the average score of class A and B after learning and using those teaching aids. It can be concluded that the teaching aids accompanied with instructions used by the teacher in teaching the same material to different classes will have similar results.