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Desafío de decenas: cálculo mental

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Desafío de decenas: cálculo mental

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Cáculo mental con decenas

Created by

Francisco Ramirez Bartolo
Francisco Ramirez Bartolo
Mexico

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Desafío de decenas: cálculo mental
 

Desafío de decenas: cálculo mentalOnline version

Cáculo mental con decenas

by Francisco Ramirez Bartolo
1

Para sumar decenas, se suman las cifras de las decenas y se añade un cero.

2

Multiplicar 30 por 3 mentalmente da 9.

3

Sumar 20 y 30 mentalmente da 50.

4

Al sumar 20 y 40 mentalmente, el resultado es 400.

5

Restar 60 de 100 mentalmente da 40.

6

Dividir 100 entre 25 mentalmente da 2.

7

Multiplicar 60 por 2 mentalmente da 120.

8

Al restar 20 de 80 mentalmente, el resultado sería 50.

9

La suma de 20 y 30 da 60.

10

Dividir 100 entre 10 da 10.

 
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