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| Vasconcelos, Isabel Cristina Peregrina, Mamede, Ema Paula Botelho da Costa and Dorneles, Beatriz Vargas The comprehension of numerical relationships in the learning of fractions: a comparative study with Brazilian and Portuguese children. Rev. Bras. Estud. Pedagog., May 2017, vol.98, no.249, p.251-269. ISSN 2176-6681
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