Math Collective Intelligence Group

Math Collective Intelligence

 
 
Picture of Ellen Anton
Math Collective Intelligence
by Ellen Anton - Friday, 27 March 2009, 1:20 PM
 
The 11s trick.

Multiply 11 x 23

The two is the hundreds digit, the 3 is the ones digit and you add the two digits for the tens. =253.
Picture of Sarah Novacek
Re: Math Collective Intelligence
by Sarah Novacek - Friday, 27 March 2009, 1:25 PM
 
That is a really neat trick! Does it work for all numbers or just the 11s?
Picture of Ellen Anton
Re: Math Collective Intelligence
by Ellen Anton - Friday, 27 March 2009, 1:27 PM
 
You should try a few and see if it works for other numbers.
Picture of Sarah Novacek
Re: Math Collective Intelligence
by Sarah Novacek - Friday, 27 March 2009, 1:29 PM
 
It has to be a meaningful comment. Does it have to be a double digit or single digit number?