To improve the learning process in mathematics, new approaches are needed. Yachay Math is visual and interactive software that has been developed to use on desktop computers, tablets and mobile devices. It is a tool for spatio-temporal reasoning, designed for students to learn mathematical concepts dynamically. Yachay Math provides to teachers a visual approach for mathematics teaching and for the students is a new way to learn fractions without text instructions, so the focus is to solve problems by students discovering. The tool was tested and validated by students and teachers from three rural schools in Apurimac-Peru. Two types of tests were performed; the first one was by using the C-Means Fuzzy methodology and the second one by the user's opinion. The results show that teachers and students consider that Yachay Math is a funny way to learn fractions in mathematics.