After solving the task, the teacher calls the children to present their ideas in front. The children begin to explain. The teacher just praises the children if the children find their solutions and then begin to lecture on what they want to teach. These classes are usually seen at the challenging stage of an open-ended approach. They are very good and better than just a lecture, because the children are given the opportunity to present their ideas. On the other hand, if the teacher just explains his order understanding without relating in to the children’s presented ideas, the children cannot connect what they already know and the teacher’s explanation. Nor can they summarize what they have learned today. Presentations of various solutions are necessary but the key is the problematic in order to achieve the objectives.