Monday, March 14, is also known as National Pi Day and restaurants and food purveyors around the country are celebrating with freebies and deals.  

The holiday comes from the date 3-14 that resembles the ratio of a circle's circumference to its diameter which is 3.14159265359--otherwise known as pi. But it is also a day that spells huge savings.

From pizza to pies, here are some of the best.

Blaze Fast Fire’d Pizza: Build your own artisanal pizza for $3.14 on Monday at participating locations nationwide on Monday.

Outback Steakhouse: Free Bloomin' Onion on Monday.

Paragon Theaters: $3.14 individual pizzas, antipasto and dolce at Mi Pi Custom Pizza Monday at Florida locations in Davie and Daytona Beach, and Virginia in  Hampton and City Center.

Pizza Hut: Solve Pi Day math problems for a chance to win "3.14" years of free pizza.

The questions are up--and they're a doozy.

Whole Foods: $3.14 discount on sweet pies and and $2 off take-and-bake pies at participating grocery stores, according to Twitter.

Bojangles': Three baked sweet potato pies can be yours for the price of $3.14 today (except for restaurants in New York).

Your Pie: All individual-size pizzas, craft beers and combo meals are $3.14 today.

Feel like whipping something up at home?  Whet your appetite with these outrageous pies math geeks --or anyone -- can cook up.