Amazing, does anyone know the algorithm behind this?(adsbygoogle = window.adsbygoogle || []).push({});

http://www.metacafe.com/watch/296904/easy_mental_multiplication_trick/"

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Easy Mental Multiplication Trick

**Physics Forums | Science Articles, Homework Help, Discussion**