Laboratorio de matemáticas: magia con números

¿Quieres que tus alumnos se diviertan con las matemáticas pero no les gusta el cálculo? ¿Quieres repasar las operaciones con tus hijos pero ellos se aburren de hacer siempre lo mismo? ¿Quieres simplemente dejar alucinados a tus amigos con unos cuantos trucos de magia infalibles? Pues presta atención, porque esto te va a gustar.

Captura de pantalla 2016-08-18 a las 0.18.01

Averiguar el día de la semana de tu nacimiento.

Seguro que te han contado cosas del día en el que naciste, pero tal vez no sepas qué día de la semana era. No es difícil averiguarlo, aunque debes tener en cuenta que febrero es un mes especial y su número de días varía cada año.
Febrero suele tener 28 días, pero si el año es bisiesto tiene 29. Para saber si un año es bisiesto lo dividimos entre 4 y si la división es exacta, entonces es bisiesto, pero si acaba en dos ceros, también tiene que ser exacta su división entre 400.

Para hallar qué día de la semana fue el 6 de febrero de 2004:
Calcula los días que han pasado desde el comienzo del año: 37 días (31 + 6).

Resta 1 al año de la fecha, divide entre 4 y anota el cociente:
2.004 – 1 = 2.003 y 2.003 : 4 Cociente: 500.


Suma al año de la fecha los días que han pasado del año y el cociente anterior:
2.004 + 37 + 500 = 2.541


Divide el resultado entre 7 y busca el resto en esta tabla:

Captura de pantalla 2016-08-15 a las 14.54.43

2.541 : 7 -> Cociente: 363 y resto 0. 

  • Como el resto es 0, el 6 de febrero de 2004 fue viernes.

Truco para averiguar la fecha de nacimiento.

Dile a la persona que participe en tu juego que:

escriba el número del día de nacimiento; 29 (es el día en que yo nací)

que lo multiplique por 100: 29 x 100 = 2.900

que le sume el mes en que nació: 2.900 + 3 (es el mes en que yo nací) = 2.903

que lo vuelva a multiplicar por 100: 2.903 x 100 = 290.300

y ahora que sume las dos últimas cifras del año de nacimiento: 290.300 + 89 (nací en 1989) = 290.389. 

que lo multiplique por 10: 290.389 x 10 = 2.903.890

que le sume el año del descubrimiento de América: 2.903.890 + 1.492 = 2.905.382

y que lo divida entre 2: 2.905.382 : 2 = 1.452.691 

Después de esto, pídele el resultado. Resta al número que te haya dado 746 y divídelo entre 5.

1.452.691 – 746 = 1.451.945

1.451.945 : 5 = 290.389

Si el resultado es par como el que nos ha dado a nosotros, las dos primeras cifras serán el día de nacimiento (29), las dos siguientes el mes (03) y las dos últimas el año (89). Si el resultado es impar, la primera cifra será el día de nacimiento, las dos siguientes el mes, y las dos siguientes el año.

 


 

Todos estos trucos han sido extraídos del magnífico libro “Carnaval matemático” del ganador de múltiples Guinness Records, Jaime García Serrano. Actualmente el libro físico se encuentra descatalogado en tiendas pero puedes adquirir el ePub en la App Store clicando aquí

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