Siegler's and Lortie-Forgues's (2014) integrative theory of numerical development suggests that mathematical development can be explained by the continuing growth of understanding of numerical magnitudes, beginning with intuitive and nonsymbolic representations of numbers through are advanced mathematics including fractions and negative numbers.

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Siegler's and Lortie-Forgues's integrative theory of numerical development indeed posits that mathematical development is a continuous process that starts with an intuitive understanding of numbers and numerical magnitudes. This theory suggests that the foundation of mathematical understanding begins with nonsymbolic representations of numbers and evolves into more complex concepts, including fractions and negative numbers, through the interaction of various cognitive processes.

Siegler's and Lortie-Forgues's (2014) Integrative Theory of Numerical Development Suggests