# Commendable Kids

## Celebrating Pi Day and Earning the Pi Badge

Mar 14, 2013

No, we aren’t talking about apple pie or any of it’s other delectable relatives, so put away your forks. This pi is a mathematical constant all kids should know about. Pi is the ratio of the circumference of a circle to its diameter, and if your child isn’t familiar with it yet, March 14th is the best day to introduce them. The short value of Pi is 3.14159, which is why March (the 3rd month) 14th is official Pi Day. Though many of us average humans only memorize Pi out to five decimal places, some have memorized it out to unbelievable lengths (see below). Pi’s true value has been calculated by super computers all the way to 2.7 trillion digits. How many is that? Well, it would take you 85,000 years to read the numbers if you read one each second!

## Why should kids learn pi?

Pi is used in geometric and architectural drawings, radio, TV, radar and telephone signals, probability estimating and simulating, global positioning, the calculation for your car’s horsepower, Einstein’s theory of relativity, determining electric force, and finding the position of two planets.

## How long ago was pi discovered?

The earliest historic record of pi dates all the way back to 1900-1600 BC, from a clay tablet in Babylon and a papyrus in Egypt. Pi became represented by the Greek letter in the mid-18th century. You can read more about the history of Pi on wikipedia.

## Can pi be entertaining?

Or put to the tune of an old classic?

## Can kids memorize pi?

You betcha! Check out these Commendable Kids:

Here’s two year old Emily:

And here’s Benjamin with 2422 numbers of Pi:

## What should a child do to earn the Pi badge?

On Commendable Kids, the exact requirements for a badge are left up to the parents and teachers, but we are happy to provide some helpful guidelines.

1. Your child should be able to define pi. (the ratio of the circumference of a circle to its diameter)
2. Your child should be able to write the symbol representing Pi, and identify what the symbol is (a Greek letter).
3. Have your child measure the diameter of a circle (perhaps to celebrate the day, measure a real pie!), and the circumference, and then divide the circumference by the diameter. Discovering pi on their own is more exciting and memorable.
4. Have your child memorize pi to at least 5 decimal places (3.14159).