What do yellow pigs and the number 17 have in common?  We aren’t sure either, but today is Yellow Pig Day and it’s a day to celebrate the unique number of 17. Join us!

### Why is the number 17 so special?

Let’s first find out if 17 is prime or composite with the help of Mathletics.

17 is superior! 17 is a prime number that is truly significant in mathematics. It is the sum of the first four prime numbers – 2, 3, 5, and 7. As described in the video, a prime number is a number that can only be divided by 1 and by itself.

### Did you know…

• A 17-sided figure is called a heptadecagon.
• In Italy, 17 is considered to be an unlucky number.
• The fear of the number 17 is called heptadecaphobia.
• It takes 17 muscles to smile.
• There are 17 muscles in a horse’s ear.
• A camel can go 17 days without water.

Why the yellow pig? It’s said that one of the creators of the day, David Kelly, had a collection of yellow pigs.  They now have a mascot for the holiday which is a yellow pig with 17 toes, 17 eyelashes and 17 teeth.

### Ways to celebrate Yellow Pig Day

• Schedule the day in increments of 17 minutes and make transitions 17 seconds
• Complete 17 acts of kindness
• Hand out 17 pieces of a small snack
• Have students complete research about the number 17 and its significance in the world
• Using an image or toy of a yellow pig to reward students, as a hall pass or even a as a ‘talking stick’