The Magic Square - Tricking Your Way To Mental Superpowers - Plot & Excerpts
Constraining their choice of number is the simplest way to start. Ideally, you want them to come up with a number between 22 and 50. A number smaller than this and you'll have to go into negative numbers (see below), and with a number larger than this the secret starts to reveal itself. I usually ask people to think of a number between 1 and 50, and if they say a number below 22 and I don't want to go into negative numbers, I will say something like "Actually, make it a bit harder. Go a bit higher." Negative Numbers If you want to make the magic square more interesting, you can make handy use of negative numbers. If they named their random number as 5, you could use -16 in the first of the 4 magic boxes, then -15, then -14, and -13. It will all add up correctly, and it does add an interesting new level to your magical squareishness. Think of a number A trick before the trick. If you ask someone to think of a number between 1 and 50, then you make a single guess, you have a 1 in 50 chance of getting it right.
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