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Reto de Cálculo Mental

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Reto de Cálculo Mental

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Sumas y restas rápidas

Created by

Guillermina Silva
Guillermina Silva
Argentina

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Reto de Cálculo Mental
 

Reto de Cálculo MentalOnline version

Sumas y restas rápidas

by Guillermina Silva
1

¿Cuánto es 47 + 26?

2

¿Cuánto es 54 - 29?

3

¿Cuánto es 128 + 57?

4

¿Cuánto es 200 - 87?

5

¿Cuánto es 63 + 19?

6

¿Cuánto es 141 - 76?

7

¿Cuánto es 89 + 44?

8

¿Cuánto es 320 - 145?

9

¿Cuánto es 76 + 23?

10

¿Cuánto es 500 - 237?

Explicación

La suma de 47 y 26 es 73; los demás resultados son errores comunes al cambiar dígitos.

54-29 = 25. Cambiar el orden o sumar de más da resultados incorrectos.

128+57 = 185; los otros valores resultan de errores de centena o decena.

200-87 = 113; recuerda restar unidades y decenas correctamente.

63+19 = 82; atención a la suma de las decenas y las unidades.

141-76 = 65; el error suele venir de restar por separado sin llevar.

89+44 = 133; combinar decenas y unidades correctamente da el resultado.

320-145 = 175; resta paso a paso para evitar desbordar decenas.

76+23 = 99; errores comunes son redondear o sumar 1 más.

500-237 = 263; lleva correctamente las unidades y decenas.

 
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