Finger maths

I've just been wondering if there was a maths out there like Jolly Phonics? and I came across finger maths.

I've tried it and it does work...but is it more difficult to remember this rather than just use your memory.

I don't know my times tables...so is this a way?

http://www.youtube.com/watch?v=jZs1MFhF9i8&feature=related

Up date

I take that back....WOW

I lay there at night playing round with this. Once I understood it amazing!!