Tema de Matemáticas Fundamentales: Operaciones numéricas

When children focus on what happens when we join two sets together or separate a set into parts, they learn about how quantities change. When they have lots of experience comparing amounts, they become familiar with thinking about differences between sets. And when they have opportunities to see how a single large set can be composed of two or more smaller sets, they get comfortable with the fact that larger numbers contain smaller numbers. These ways of mentally modeling real situations are what we mean by number operations. Number and operations are key to many thought processes that occur in children's minds.
© Erikson Institute's Early Math Collaborative. Reimpreso de Big Ideas of Early Mathematics: What Teachers of Young Children Need to Know (2014), Pearson Education.

Una cantidad (conjunto) puede descomponerse en partes iguales o desiguales; las partes pueden componerse para formar el conjunto.
Los conjuntos pueden compararse utilizando el atributo de la numerosidad, y ordenarse por más que, menos que e igual a.
Los conjuntos pueden modificarse añadiendo elementos (uniendo) o quitando algunos (separando).

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