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    Alguns aspectos negligenciados na compreensão e ensino de números e sistemas numéricos
    (1999) GRATTAN-GUINNES, Ivor
    Cultural questions have attended arithmetic since it began to develop in ancient times. They include possible differences between integers and non-integral numbers and in operating with them, religious and mystical uses and interpretations, the roles of zero, extensions to infinite numbers, and representing numbers by numerals in ways which are not well known but could be used in teaching, either at school or undergraduate level. Comments on educational utility are given, mostly at the end of each section; the word "student"refers to learners of all ages.