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ESPAÑOL
Idea de juego 7:
carta bajo trapo
escoger ayudante
instrucciones:
4
4 + 2 = 6
6 x 2 = 12
12 + 1 = 13
13 - 4 = 9
9 - 4 = 5
5 + 3 = 8
mostrar carta
Juego 7:
Números encantados
Un truco matemático que sorprenderá a todo el mundo.
Para un niño.
Eres el gran mago de los números. Sabrás el resultado de un
problema incluso antes de saber qué números lo componen.
Necesitas
La carta de resultado con el número 8, el lápiz, una hoja
de papel y un trapo.
Esconde la carta debajo del trapo. Nadie debe ver qué
número muestra la carta.
Escoge a alguien del público para que sea tu ayudante.
Esta persona coge el lápiz y el papel e irá calculando
siguiendo tus indicaciones. El público vigila que los
cálculos del ayudante sean correctos.
Da a tu ayudante las siguientes instrucciones:
«Elige un número entre 1 y 7 y escríbelo (por ejemplo, 4)
Súmale 2 y escribe debajo el resultado.
Multiplica este número por dos y escribe debajo el
resultado.
Súmale 1.
De este resultado, resta el número que elegiste primero.
Resta al resultado otra vez el número que elegiste primero.
Suma 3 y dinos el resultado final.»
Ahora levantas el trapo y muestras la carta al público.
¡Es ocho!
Pero ¿cómo puede ser que supieras eso incluso antes
de que tu ayudante eligiera un número?
70


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