On Fri, Nov 2, 2012 at 10:52 PM, kirby urner <email@example.com> wrote:
> Being good at arithmetic means you're a well oiled machine, like fast > with an abacus, maybe you have lots of mental tricks and can add the > grocery bill in your head. Good for you (applause!). But that's more > under the heading of "salon trick" or "impress your friends at > parties". Math means knowing lots of theorems and history and > applications and... > > > Kirby > > ** http://www.grunch.net/synergetics/mathsummit.html
Since posting this, one of my colleagues has brought to my attention the Japanese sport of mental arithmetic.
Flash Anzan is where you don't even use an abacus (other arithmetic sports allow it).
In this videos, two young girls play a word game with each other (my word has to start with the letters yours ends with I think it is) while at the same time taking in the 15 numbers they need to mentally add: