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Square Root Day

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This year is March 03 2009 (03/03/09)

... next Square Root Day will be 04 April 2016 (04/04/16).

The final square root day of the century will occur on September 9, 2081. Each century it is the same nine dates that are Square root days.

Ron Gordon, a Redwood City, California high school teacher, first created the day for 9/9/81. Gordon is the official public relations person and sends news releases to world media outlets. In addition, his daughter has got in on the act and set up a Facebook page for people to share how they were celebrating the day.

One suggested way of celebrating the holiday is by eating square radishes, or other root vegetables cut into shapes with square cross sections.

[from http://en.wikipedia.org/wiki/Square_root_day]
[Photo by sparkleice: http://www.flickr.com/people/sparkleice/]

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Cool Square Root Things

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Solving Equations Involving Square Roots

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Fun Square Root Stuff

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Full List of Square Root Days

* 1/1/01
* 2/2/04
* 3/3/09
* 4/4/16
* 5/5/25
* 6/6/36
* 7/7/49
* 8/8/64
* 9/9/81

How to calculate a square root without a calculator

and should your child learn how to do it?

Many school books seem to think that since calculators can find square roots, that kids don't need to learn how to find square roots using any pencil-and-paper method. But learning at least the "guess and check" method for finding the square root will actually help the student UNDERSTAND and remember the square root concept itself!

So even though your math book may totally dismiss the topic of finding square roots without a calculator, you can consider to let them practice at least the first method presented here. This method, "guess and check", actually works around what the square root is all about, so I would consider exercises with it as essential to help children understand the concept of square root.

Depending on the child, it might be good to concentrate on teaching the concept of square root without taking the time for paper-pencil calculations. In this case, you can study the guess and check method with the help of a simple calculator that doesn't calculate square roots but can quickly do the multiplications.
=================> Read how at Home School Math

Square Root Calculation System

Learn how to mentally calculate square roots and amaze your friends!

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  • surfsusan Jun 21, 2009 @ 5:44 am | delete
    Silly? We geeks want to be taken seriously :-) have you checked lenses for Pi-Day? LOL.
  • Reggie_Marigold Jun 16, 2009 @ 12:33 pm | delete
    What a silly lens. Engineers I know will love to celebrate it in 2016. If only I'd knonw for this year. Cute lens...thank you!
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