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Tuesday, September 13, 2011

Having Fun with Circles - A Math Trick for Kids


Having Fun with 2-D shapes.

Can a quarter (a circle) fit through a hole the size of a dime (a circle) ???




 Teach this trick to the kids then they can amaze their friends!

Materials
  • dime
  • quarter
  • paper
  • pencil
  • scissors


Directions
  • Trace around a dime.
  • Cut out the inside of the circle.
  • Try to slip the quarter through the hole without tearing the paper. 


    Are you ready for the solution?

    Solution
    • Fold the paper across the diameter (center) of the circle.
    • Now sandwich the quarter between the halves of the circle.
    • Pull the sides of the paper upright.
    • The quarter will slip through!!!

    Why?

    • The circle turned into an ellipse!  That made the diameter of the hole Bigger!


    I got this trick from a fun math book!

     Real-World Math for Hands-On Fun! (Williamson Kids Can Books)
    Real-World Math for Hands-On Fun! (Williamson Kids Can Books)

    by Cindy A Litterfield

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    2 comments:

    1. What a great idea. I homeschool my kiddos so I think I am going to really love your blog!

      Following you from a blog hop.

      http://mompointofview.blogspot.com/

      ReplyDelete