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Adivinanza de números con suma y resta

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Adivinanza de números con suma y resta

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Descubre el número partiendo de operaciones simples

Created by

Juan Montes Canchila
Juan Montes Canchila
Colombia

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Adivinanza de números con suma y resta
 

Adivinanza de números con suma y restaOnline version

Descubre el número partiendo de operaciones simples

by Juan Montes Canchila
1

Un número desconocido, al que le sumo 28 y luego le restas 12 para obtener 40. ¿Qué número era?

Pistas

Isola el número desconocido: x + 28 - 12 = 40 ⇒ x + 16 = 40 ⇒ x = 24.

Agrupa las operaciones para ver cuánto aporta el número desconocido al resultado: primero 28, luego restas 12.

Piensa en las operaciones en el orden dado: suma, luego resta, y que el resultado final es 40.

2

Me uso para unir dos números y hacer más. Si cambio el orden, en la suma suele ser igual, pero en la resta cambia. Si uno vale cero, el otro permanece igual. ¿Qué soy?

Pistas

3) El cero funciona como identidad en la suma y como cero resta en algunos casos, manteniendo al otro número igual cuando se resta 0.

2) En la suma, cambiar el orden no cambia el resultado; en la resta, sí.

1) Una operación suma números para obtener más; la idea de unir.

 
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