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"Decimal positional numeral system" as a book category groups works that focus on the base‑10 place‑value way of representing numbers—its mathematical principles, history, pedagogy and applications. This includes textbooks and tutorials explaining place value, addition, subtraction, decimals and algorithms; historical and cultural studies of Hindu‑Arabic numerals and the adoption of positional notation; reference and technical guides on decimal arithmetic in computing, finance and measurement; and popular books or children’s titles that introduce the concept of place value. Any book in this category centers on how digits and positions encode quantity in a decimal system, its practical uses, development, and implications for education, technology and society.

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