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Sumas y Restas: Desafío Medio

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Sumas y Restas: Desafío Medio

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About this activity

Prueba de operaciones básicas

Created by

JOSEPH RUEDAS SANTANA
JOSEPH RUEDAS SANTANA
Colombia

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Sumas y Restas: Desafío Medio
 

Sumas y Restas: Desafío MedioOnline version

Prueba de operaciones básicas

by JOSEPH RUEDAS SANTANA
1

¿Cuánto es 125 + 48?

2

Resta 204 - 89.

3

Calcula 370 + 260.

4

¿Cuánto es 512 - 176?

5

Sumamos 89 + 911.

6

Calcula 245 + 757.

7

Resta 999 - 444.

8

¿Cuánto es 300 + 120?

9

Resta 587 - 289.

10

Calcula 410 + 390.

11

¿Cuánto es 750 - 333?

12

Sumemos 123 + 777.

13

Resta 860 - 205.

14

¿Cuánto es 999 + 1?

15

Calcula 60 + 240.

16

Resta 540 - 123.

17

¿Cuánto es 310 + 690?

18

Calcula 430 - 215.

19

¿Cuánto es 256 + 744?

20

Resta 1200 - 589.

Explicación

La suma 125+48 = 173. 170, 181 y 168 son resultados de errores de agrupación o aritmética simple.

204-89 = 115. Los otros son errores comunes de resta.

Sumas 370+260 = 630. Los distractores se acercan pero son incorrectos.

512-176 = 336. Los otros son errores de columna.

89+911 = 1000. Es un resultado redondo, fácil de distraer con errores.

246+757 es 1002; errores comunes cercanos.

999-444 = 555. 555 es correcto, otros se deben a error de borrones.

300+120 = 420. Distractores varían en posición decimal.

587-289 = 298. Errores comunes por resta mal alineada.

410+390 = 800. Otros errores por reajuste de decenas.

750-333 = 417. Errores de transporte de unidades.

123+777 = 900. 900 es clave en series.

860-205 = 655. Errores por restas cercanas.

999+1 = 1000. Traba típica de conteo.

60+240 = 300. Distractores por decimación de decenas.

540-123 = 417. Errores por confusión de decenas.

310+690 = 1000. Redonda, fácil de confundirse.

430-215 = 215. Restas parciales pueden confundir.

256+744 = 1000. Suma tope en centenas.

1200-589 = 611. Errores por restas cercanas.

 
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