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| Book Title | Author(s) / Source | Description | Key Topics | | :--- | :--- | :--- | :--- | | | Abramo Hefez / OBMEP | A text for undergraduate Math students and teachers. It goes into depth on the properties and operations of natural numbers. | Natural numbers, induction, Euclid's algorithm, prime numbers, modular arithmetic. | | Aritmética dos Números Inteiros | Roberto Ribeiro Paterlini / UFSCar | A clear, didactic textbook designed for future math teachers, with a focus on the integer number system. | Number systems, integers, operations, and the foundations of arithmetic. | | Lições de Arithmetica - 1a. Parte | André Perez y Marin / UFSC | A classic historical textbook from 1913, offering valuable insight into the teaching of arithmetic in the past. | Integers, decimals, metric system, divisibility, prime numbers, fractions. | | Compendio de arithmetica | Cândido Batista de Oliveira / USP | A rare, historical 1832 compendium used in primary schools in Brazil, showcasing the early methodology of math education. | Basic arithmetic operations as taught in the 19th century. | | Aritmética Básica | Professor Helderson Colares | A comprehensive overview of basic arithmetic concepts, from number definitions to operations. | Basic operations, number sets, fractions, decimals. |