Conflicting situations between what one wants to acquire and the limit imposed by financial resources require financial planning. The current study presents an excerpt of a Master's research in Mathematics Education, based on qualitative approach, whose goal was to disclose contributions from Problem Solving, according to the Problem Solving methodology, to the Financial Education of a group of worker-students enrolled in the 1st year of a public night-shift High School. Observation, field journal, documentary records of assignments involving family planning and questionnaires were used for data collection purposes. Based on the analyses, Problem Solving, in the way it was organized – i.e., involves personal and family financial planning- enabled contributing to participants’ Financial Education, which would be in compliance with their social and financial reality, and allowed them to exercise citizenship.