Mathematics is usually considered difficult by students and is a concern of teachers regarding to school performance. Our challenge is to improve the quality of education and to do this we must be clear about what we want students to learn and what and how to teach that this learning happens. Problem solving is emphasised by the National Curriculum Parameters as a starting point of mathematical activity, offering to the student the opportunity to mobilise knowledge and develop the ability to manage the information that is at their fingertips. Whereas the resolution of a problem implies in the understanding and in the presentation of answers using appropriate procedures, it should be noted that there are several ways to achieve the same result, ie, there are numerous strategies that the students can use in this process.