Post Series: Fun with Maths

Preparation: Nothing. Steps:   Ask someone to write a 3-digit number. Now ask them to multiply the number by 7, then by 11 and then by 13. They can use a calculator if they want. Claim that you shall tell…

Want to read this? Sign in or register for free.

      Register for free

The 7-11-13 magic trick
Average rating of 2.8 from 4 votes