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Tell them to think of a number between 1-9.
Tell them to double it
Tell them to add, let's say, 4
Tell them to half it
Tell them to tell them their answer
and their answers would be 2.
How? Easy.
Half of the number you tell them to add after they double their, is the number they started with.
In this case, 2 would be their starting answer because half of 4 is 2
It also works with odd numbers, if you're good at calculating decimals
So remember.
Think of a number.
Double it
Add a number of your choice
Half it
Ask for their answer.
Half the number you told them to add
Tell them
And there you go, they'll think you're a mind-reader
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How does think of a number mind game works?
By using the inverse function - inverse operations in the reverse order. If you are asked to think of a number, (A) multiply by 7, and (B) add 5, the person "reading your mind" will start with your answer and (B-1) subtract 5, and (A-1) divide by 7. Sometimes some of these are built into the process so that the "quizzer" has less to do.
How do you make any number equal 3?
By using some incorrect procedure. Common "tricks" are division by zero, equating the negative and positive square roots.
What are some dreidel tricks?
Aside from spinning the dreidel upside down (which looks hard, but is actually very easy), there are no tricks. Just the Dreidel game.
Do magic tricks involve math?
Some do although most don't
Why is the sum of two odd numbers even?
-- The first odd number is some even number plus an extra ' 1 '. -- The second odd number is some even number plus an extra ' 1 '. -- Add them. You get (an even number) + (an even number) + ( 2 ). That's an even number. ======================== Another mind-bending , brain-busting way to look at it : -- The first odd number is some even number plus an extra ' 1 '. -- The second odd number is some even number minus ' 1 '. -- Add them. You get (an even number) + (an even number) + ( [1 - 1] or zero ). That's an even number.
