22nd July – 22/7 A reasonable approximation for Pi – good to 2 decimal places.

If you want a better approximation for Pi you could use 333/106 which is good to 4 decimal places, or, for even more accuracy, use 355/113 which is good to 6 decimal places.

But you can’t write Pi as an exact fraction as it is an ** irrational number**.

Irrational numbers are real numbers that * can’t *be written as an exact fraction. It has never ending, never repeating numbers to the right of the decimal point.

22/7 – Approximate Pi Day – Enjoy!

## 2 Comments

Here is a contrarian view of π day in general:

http://ccssimath.blogspot.com/2013/03/the-life-of-pi.html

Excellent resource. Thank you for sharing.

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