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Adicão de Frações
Esse material permite calcular adição de frações geometricamente. As frações próprias que se formam são subdivididas formando frações equivalentes a primeira com denominadores iguais e possiveis de se calcular a soma. A sobreposição representa a soma das duas frações equivalentes a primeira.
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Comments
Natalia Moore (Faculty)
It appears to me the illustration for the sum is incorrect and is instead the illustration for the product of the two fractions. The region that is shaded twice is the product of 1/3 and 2/5 or 2/15. The sum of 1/3 and 2/5 is 11/15 but the shading shows only 9 of the 15 rectangular regions shaded. I think there is a step missing in this geometric addition of fractions with unlike denominators.
Elisabeth Machado Bastos (Teacher (K-12))