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Desafío de Cálculo Mental

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Secuencias y rápidas cuentas

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Peru

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Desafío de Cálculo Mental
 

Desafío de Cálculo MentalOnline version

Secuencias y rápidas cuentas

by Diana Benites canteño
1

¿Qué número sigue en la secuencia 2, 4, 6, 8, 10, ?

2

¿Cuál es el resultado de 7×8?

3

Completa la serie: 1, 2, 4, 7, 11, ?

4

Si 25÷5 = 5, ¿cuánto es 25÷?

5

¿Qué número es la mitad de 48?

6

Secuencia: 3, 9, 27, 81, ?

7

Si 60% de 50 es?

8

¿Cuánto es 15+15+15?

9

Completa: 100, 90, 80, 70, ?

10

Si un reloj marca las 3 en punto, ¿cuánto falta para las 4?

Explicación

La secuencia suma 2 cada vez; el siguiente es 12.

7 por 8 es 56.

Cada término suma el índice anterior más uno; 11+5=16.

La instrucción es dividir 25 entre 5; resultado 5.

Mitad de 48 es 24.

Cada término se multiplica por 3; 81×3=243.

0.6×50 = 30.

Sumando tres veces 15 da 45.

Resta 10 cada vez; 70−10=60.

Entre horas completas hay 60 minutos.

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