pi 3.141596… 22/7 

  
You could draw a circle with a diameter of 1.

Then the circumference (the distance all the way
around the edge of the circle) will be Pi

A quick and easy approximation for π is 22/7
22/7 = 3.1428571…
But as you can see, 22/7 is not exactly right. In fact π is not equal to the ratio of any two numbers, which makes it an irrational number.
A better approximation (but still not exact) is:
355/113 = 3.1415929…

(think “113355”, then divide the “355” by the “113”)
Remembering
I usually just remember “3.14159”, but you can also count the letters of:
“May I have a large container of butter today”

3 1 4 1 5 9 2 6 5

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