Showing posts with label Maths. Show all posts
Showing posts with label Maths. Show all posts

Tuesday, February 28, 2012

Quick trick to learn the multiplication table of 9!

The C'2 kids know the multiplication table from back to front!
And they're sharing with you a trick with which you can learn the multiplication table of 9, too!
What might 6x9 equal?

And, if you didn't get it, watch again!
What does 7x9 equal?

Let us explain! 

"Open" your ten fingers and "close" the one for which you want the result. 
e.g. in 4x9 we must "close" the fourth finger. 
Begin counting the decades on the fingers before the "closed" one: They're 3 so, 10, 20, 30 
Count the units on the remaining fingers: They're 6 so, 1,2,3,4,5,6
The result is 4x9=36! 
Easy, isn't it?
Don't think, though, that you can find all the "difficult" results that way!
This magic trick unfortunately only works with the multiplication of 9! Sob!


Original Post by Maria Priniotaki


Friday, February 3, 2012

The Chinese multiplication

Do you think you know everything about multiplication?
You're fooling yourself...
Watch the following video on how the Chinese multiply...without the multiplication table!!


...And our riddle-contest:
Who can multiply 32 * 45 in the Chinese way?

Original post by Dimitris Alexakis