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Descomposición y saltos en restas

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Descomposición y saltos en restas

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Resta con estrategias útiles

Created by

Paula Montesori
Paula Montesori
Colombia

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Descomposición y saltos en restas
 

Descomposición y saltos en restasOnline version

Resta con estrategias útiles

by Paula Montesori
1

Para resolver 64 - 27, ¿qué estrategia conviene usar primero?

2

¿Qué estrategia evita restas largas en 84 - 29?

3

Para verificar una resta, ¿qué técnica es útil?

4

Completa: 72 - 15 usando descomposición. ¿Cuál es el resultado?

5

Si restas números y obtienes un resultado cercano a 0, ¿qué haces?

6

¿Qué afirma correctamente la estrategia de saltos?

7

En 93 - 46, ¿qué estrategia de descomposición es eficiente?

8

Si una resta no parece clara, ¿qué tipo de verificación usarías?

9

¿Qué indica que una estrategia es adecuada para restas rápidas?

10

En 58 - 23, ¿qué estrategia es más directa?

Explicación

La descomposición facilita restar decenas y unidades por separado.

Descomponer en 80+4 y 20+9 facilita el cálculo.

Redondear ayuda a comprobar si la respuesta tiene sentido.

72-15 se descompone en (70-10)+(2-5) y da 57.

La estimación ayuda a verificar si la respuesta es razonable.

Saltos permiten acercar para restar mentalmente.

93=(90+3),46=(40+6) facilita la resta.

Descomponer en rebajas sucesivas ayuda a confirmar el resultado.

Las estrategias rápidas destacan cambios en decenas y unidades.

Descompones 58=(50+8),23=(20+3) para facilitar la resta.

 
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