The theme of this work is how to make use of Ratios and Proportions as a consumer
protection tool. It is considered that this subject is of extreme relevance since it is
capable of demonstrating that Mathematics is a prosperous field, contextualized and
applicable to the life and day-to-day of all people. To produce the work, bibliographical
research is used regarding what the Common National Curricular Base and the
National Curricular Parameters recommend, as well as what is contained in the
textbooks of the 7th year of Elementary School chosen by the Guide of the National
Book Program and the Didactic Material (PNLD) of 2020, in addition to other authors
who debate the issue. Law No. 8,078, of September 11, 1990 – on consumer rights –
is also used as a tool to show where consumers are supported and how, through
mathematical knowledge, they can be able to supervise and understand whether they
are being respected at all times. make purchases. It is concluded that knowledge about
Ratios and Proportion matters proved to be useful in the inspection process and
conscious purchases.
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