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# All posts tagged "mathematical tricks"

• A Quick Arithmetic Trick

This is a very quick trick for which you need no equipment, and can thus perform it spontaneously. by Franka Miriam Brueckler For the purposes of this short text, by number we mean a positive integer. The...

• Posted February 1, 2016
• 0
• 1089

This is one of the mathemagical classics! The trick itself is a simple example of ‘number magic’, but not only that it can be used to teach some maths in school, the background has even been extended...

• Posted February 1, 2016
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• Magic number 9

Most people remember from school: A number is divisible by 9 if and only if the sum of its digits is divisible by 9. by Franka Miriam Brueckler For example, 256482 is divisible by 9 because 2...

• Posted February 1, 2016
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• A binary trick

A classic among mathematically based mind-reading tricks uses a number of flash cards to help the performer discover the number the spectator is thinking of. by Franka Miriam Brueckler The principle is simple: Any integer can be...

• Posted February 1, 2016
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• A trick for three

While most mathemagical tricks involve only the performer and one spectator, here is an example of a trick that involves three spectators. To perform it, you need a standard deck of 52 cards, which are given to...

• Posted February 1, 2016
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• A symmetric trick

One of the tricks that always impress the audience who do not know the simple geometry behind it is this simple card trick. It can be done quickly, and works well in all settings by Franka Miriam...

• Posted February 1, 2016
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• Cheney’s trick

The trick we shall describe here is also known as the best card trick there is. It is more elaborate than most standard mathemagical tricks, but the effort is worthwhile, because the effect is stunning for most...

• Posted February 1, 2016
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• Prime and Composite

A great simple card trick involving two spectators is this one. When disclosed, it reminds them of something they should have learned in school…  by Franka Miriam Brueckler …the difference between prime and composite numbers, which can...

• Posted February 1, 2016
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• Orden en el universo!

Select 9 consecutive cards of your favorite suit, e.g., the diamonds from ace to 9, and present this well-ordered set to the audience. Some card tricks using math.  by Ehrhard Behrends Select 9 consecutive cards of your...

• Posted February 1, 2016
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