Ok, Pick a number between 1 and 10.
We use 1 and 10 because the math is easier then, lol.
It will work with any number though.
Then, Double it.
Then, Add 6 to it.
Then, Divide that in half.
Then, Subtract the number you first started with.
What do you have left??
Everyone will have the same number left Similar to those clock tricks that Copperfield does with everyone on TV.