How to Do a Telephone Number Math Magic Trick

Memorize this cool little calculator trick and amaze your friends and family. Through a series of calculations, you can get the calculator to display a phone number. It works every time, with any seven-digit phone number, no matter if it is a landline or a cellphone. So the next time you're bored, just whip out your calculator app and get ready to impress your friends.

Instructions

1. • 1

     Enter the first three digits of your phone number into the calculator. Don't use the area code.

   • 2

     Multiply the number by 80 and then add 1 to the answer.

   • 3

     Multiply the new number by 250.

   • 4

     Add in the last 4 digits of the same phone number and then add in the 4 digits again.

   • 5

     Subtract 250 from the result.

   • 6

     Divide the number by 2. The final answer should be the full telephone number.