The basic idea behind using investigation and discovery techniques in the mathematics education is to encourage students to find the answer to the asked question by themselves. In this way, students are becoming familiar with all phases of the scientific research. In the mathematics education this can be accomplished by using computer technology as well. The main goal of this thesis is to show that different mathematical concepts can be introduced to students by using computer technology. Using dynamic geometry software, basic geometrical concepts are thought. Students, working alone or in pairs, by means of dynamic geometry software, explore given concepts and come to desired conclusions on their own. Apart from dynamic geometry software, spreadsheet tools can be used. By combining aforementioned tools, functions (affine functions, quadratic functions and absolute value functions) and limit of a sequence are tested. If students cannot visualize particular mathematical problem, they can use different graphical tools. If so, students can visualize problems and develop their own “spatial hut”. The last chapter of the thesis demonstrates that the visualization helps when basic mathematical concepts are thought, but also when more advanced mathematical problems are being solved.