lunes, 16 de mayo de 2011

Suma: agrupando cantidades.

Para sumar cantidades con unidades y decenas podemos nosotros agrupar las decenas y las unidades.
Pero para que comprendas mejor te invito a observar el siguiente vídeo.

 Te diste cuenta que es muy sencillo sumar con cantidades de dos dígitos, es decir sumar decenas y unidades.
 Si practicas este tipos de ejercicios,  tu mente será mas ágil para la Matemática.

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