Jump to content


Welcome to BrainDen.com - Brain Teasers Forum

Welcome to BrainDen.com - Brain Teasers Forum. Like most online communities you must register to post in our community, but don't worry this is a simple free process. To be a part of BrainDen Forums you may create a new account or sign in if you already have an account.
As a member you could start new topics, reply to others, subscribe to topics/forums to get automatic updates, get your own profile and make new friends.

Of course, you can also enjoy our collection of amazing optical illusions and cool math games.

If you like our site, you may support us by simply clicking Google "+1" or Facebook "Like" buttons at the top.
If you have a website, we would appreciate a little link to BrainDen.

Thanks and enjoy the Den :-)
Guest Message by DevFuse
 

Photo
- - - - -

This isn't Math!


Best Answer DeGe, 17 July 2013 - 10:24 PM

Spoiler for I think
Go to the full post


  • Please log in to reply
7 replies to this topic

#1 BMAD

BMAD

    Senior Member

  • Members
  • PipPipPipPip
  • 1696 posts
  • Gender:Female

Posted 17 July 2013 - 08:15 PM

Sometimes, I find, math students get obsessed with numbers.  So an exercise that I often assign the class is a geometric measurement problem.  I assign each student in the class an identical solid rectangular prism and a string (that is randomly cut so that no student is guaranteed the same size string but each string is longer than the biggest length of the prism).  The students are then challenged to come up with a method without the use of pencil and paper to find the measurement of two opposing corners of the prism like in the picture below.  Remember the rectangular prisms are solid so a direct link is impossible.  The students may share supplies in order to complete this calculation.

 

What is the least amount of student supplies needed to complete this calculation?

 

 

puzzle.png


  • 0

#2 TimeSpaceLightForce

TimeSpaceLightForce

    Senior Member

  • Members
  • PipPipPipPip
  • 668 posts
  • Gender:Male

Posted 17 July 2013 - 09:12 PM

Spoiler for


  • 0

#3 BobbyGo

BobbyGo

    Advanced Member

  • Members
  • PipPipPip
  • 131 posts
  • Gender:Male

Posted 17 July 2013 - 09:55 PM

Spoiler for

  • 0

#4 BobbyGo

BobbyGo

    Advanced Member

  • Members
  • PipPipPip
  • 131 posts
  • Gender:Male

Posted 17 July 2013 - 10:09 PM

Spoiler for

  • 0

#5 DeGe

DeGe

    Advanced Member

  • Members
  • PipPipPip
  • 128 posts
  • Gender:Male
  • Location:Paris

Posted 17 July 2013 - 10:24 PM   Best Answer

Spoiler for I think

  • 0

#6 BMAD

BMAD

    Senior Member

  • Members
  • PipPipPipPip
  • 1696 posts
  • Gender:Female

Posted 17 July 2013 - 10:36 PM

Spoiler for

no markers of any sort.  you are on the right track with this solution but there is a more efficient (less material needed) solution


  • 0

#7 k-man

k-man

    Advanced Member

  • Members
  • PipPipPip
  • 472 posts
  • Gender:Male

Posted 17 July 2013 - 10:47 PM

Spoiler for


  • 0

#8 BMAD

BMAD

    Senior Member

  • Members
  • PipPipPipPip
  • 1696 posts
  • Gender:Female

Posted 17 July 2013 - 11:00 PM

essentially the removal of the 4th block in Dege's answer is equivalent to K-man's


  • 0




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users