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The learning of content on proportionality is directly and indirectly called into question by teachers, especially of the disciplines that mobilize this knowledge to give treatment of the specific contents of the discipline, namely physics, chemistry, geometry and others. Understanding the multiplicative relationship is essential for learning proportionality and its use in different contexts. To this end, it is the responsibility of the Mathematics teacher to develop these skills and abilities, which begins early in primary education and is taught explicitly in the 9th grade of the 1st cycle of secondary education, of the angolan teaching subsystem. In this order, looking at the impact of knowledge of proportionality, on daily life and understanding of contents of other disciplines, the development of the study was elected, trying to answer the following question: do the knowledge acquired by the students of the 9th grade of secondary education favor, in a positive way, the frequency of programs whose treatment of the contents require the mobilization of knowledge about

A proporcionalidade na 9ª classe do 1º ciclo do ensino secundário. Uma análise sobre as competências desenvolvidas