Everyone likes to be amazed.  Sleight of hand magic, spooky coincidences, strange facts…they all leave us with some form of curiosity. Even a fun math trick can leave you bewildered. This is because from the time of our births, we go about the business of trying to figure out how the world works.

When we’re met with something we can’t clarify, even a math trick, our brain goes into thrill mode.

The incapability to explain something you’ve encountered implies the world isn’t as ordered and practical as you once thought it might be. It might even be a little dangerous. In fact, magic tricks and the like trigger the same part of the brain that responds to roller coasters and scary movies.

While this math trick might not give you the same level of thrill as would a scary movie, it might still leave you thinking how it’s possible.

Because this trick promises to not only guess the number you chose, but also your exact age. Follow the directions below carefully and prepare to be astounded!

You might want to grab a pencil and paper or a calculator for this math trick:

1. Choose a number from 1 to 9 (number = a):
1 2 3 4 5 6 7 8 9

2. Multiply your number by 2.
a x 2