Children start primary education with varying math skills. Some of them understand the
fundamentals of numbers and math, while others struggle with understanding basic counting,
number recognition, understanding symbols, quantity discrimination, and addition and
subtraction concepts. This set of numeracy skills at the beginning of school life is often
referred to as number, sense or early math skills. Students need to establish and understand
these competencies before moving on to more complex math tasks. Therefore, to
problematize this study, the following question is essential: What is the importance of the
numerical set in the learning of mathematics? Numerical sets are important for grouping
numbers that have the same characteristics, seeing the possibilities that the groupings of
numbers also have restrictions. The analysis of this work led us to conclude that learning
numerical sets is difficult for students. The chronological presentation of the appearance of
sets has facilitated the learning not only of numerical sets, but mathematics in general.
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