Pi is one of those special numbers in math that shows up again and again when dividing the circumference of a circle by its diameter - no matter how big or small a circle is.
Pi is also a fun number to explore - with its digits going on and on! This has been a number that has intrigued mathematicians for thousands of years.
Check out some of these resources:
NCTM Pi Day: https://www.nctm.org/piday/
Exploring Pi/Scholastic: https://www.scholastic.com/teachers/articles/teaching-content/exploring-pi/
NEA resources: http://www.nea.org/tools/lessons/50840.htm
PiDay: https://www.piday.org/
Pi 2019: https://www.exploratorium.edu/pi
