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Desafío de Decenas y Secuencias

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Ejercicios sobre decenas, orden y suma

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Ecuador

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Desafío de Decenas y Secuencias
 

Desafío de Decenas y SecuenciasOnline version

Ejercicios sobre decenas, orden y suma

by Jaque Brito
1

Ordena de menor a mayor: 27, 32, 24, 29.

2

¿Qué decena ocupa la cifra 68?

3

Completa la secuencia: 15, 25, 35, ?

4

¿Cuál es la suma de 27 y 18?

5

Ordena por valor creciente: 41, 14, 104, 9

6

Si en una suma, 58 + 27, ¿cuántos decenas hay en el resultado?

7

Completa la secuencia: 90, 80, 70, ?

8

Si 34 se suma a 26, ¿qué decena predomina en el resultado?

9

Ordena de mayor a menor: 12, 102, 9, 65

10

Si 40 + 15 = ?, ¿cuántas decenas se suman?

Explicación

La decena y la unidad guían el orden: 24 < 27 < 29 < 32.

Cifra 6 en la decena y 8 en la unidad.

Incremento de 10 en cada paso, manteniendo las decenas.

27 + 18 = 45; suma de decenas y unidades.

Considera decenas y unidades; 9, luego 14, luego 41, luego 104.

58+27=85; 8 decenas. Pero preguntan decenas en resultado correcto: 85 tiene 8 decenas.

Se resta 10 cada paso manteniendo decenas.

34+26=60; la decena dominante es 6 en 60, pero la respuesta correcta es preguntar decena predominante.

Considera tamaño de números: 102 > 65 > 12 > 9.

40 + 15 = 55; se suman 5 decenas en el total.

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