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Desafío de Cálculo Mental 6º

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Desafío de Cálculo Mental 6º

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Cálculo mental para sexto

Created by

Héctor Hernández
Héctor Hernández
Guatemala

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Desafío de Cálculo Mental 6º
 

Desafío de Cálculo Mental 6ºOnline version

Cálculo mental para sexto

by Héctor Hernández
1

237 + 198 = ?

2

56 × 9 = ?

3

144 ÷ 12 = ?

4

¿Cuánto es 3/4 de 320?

5

2500 - 987 = ?

6

¿Cuánto es el 25% de 320?

7

7 × 8 + 6 = ?

8

81 ÷ 9 = ?

9

Un libro cuesta 18 y hay un descuento del 15%. ¿Precio final?

10

¿Cuál es el valor de π aproximado a dos decimales?

11

Si una botella contiene 1.5 L y viertes 0.75 L, ¿cuánto queda?

12

¿Cuál es el equivalente en fracción de 0.25?

13

Si dos números suman 15 y su diferencia es 3, ¿cuáles son?

14

1) 234 + 156 = ?

15

2) 480 ÷ 12 = ?

16

3) 7 × 8 + 6 = ?

17

4) 90 - 27 = ?

18

5) (3/4) de 80 = ?

19

7) 144 ÷ (6 + 3) = ?

20

8) 2/5 de 45 = ?

Explicación

La suma de las centenas, decenas y unidades da 435.

6×9=54 y 50×9=450; 54+450=504.

12 cabe 12 veces en 144.

3/4 de 320 es (3×320)/4 = 240.

Resta simple: 2500-900=1600; 1600-87=1513.

25% de 320 es 320/4 = 80.

7×8=56, luego +6 = 62.

9 cabe 9 veces en 81.

Descuento del 15%: 18×0.85 = 15.3.

π ≈ 3.14.

1.5 − 0.75 = 0.75 L.

0.25 = 25/100 = 1/4.

Algebra: x+y=15, x−y=3 → x=9, y=6.

La suma de 234 y 156 es 390; añade 150 para 384 y 6 más para 390.

12 × 40 = 480, por eso la división da 40.

7×8 = 56; 56 + 6 = 62.

90 menos 27 da 63.

0.75 × 80 = 60.

6+3=9; 144 ÷ 9 = 16.

(2/5) × 45 = 18.

 
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