It’s Pi Day! Here are the best freebies and discounts for pizza and other pie-related goodies

• Pi Day is March 14. Plenty of restaurants and pizza shops are offering deals for cheap or free pizzas and pies. Even more have deals for $3.14.

As you sat in elementary school or junior high and your math teacher began introducing algebraic terms to your vocabulary, you (like many others) may have thought “there’s no way I’ll use this once I’m out of school.” That may be true with integrating factors and centroids, but Pi can save you some money.

The ratio of the circumference of a circle is 3.14 (though the number itself goes on forever). Long ago, math nerds declared March 14 (3/14) Pi Day. And it didn’t take long for marketers to capitalize on that.

Head to your local dessert store, grocer, or bakery and there are better-than-average odds you can get a discount on an apple, cherry, or blueberry pie today. But the discounts don’t end there. Here’s a roundup of retailers, many of whom specialize in pizza pie, offering discounts and freebies on Friday, March 14.

Pizza bargains on Pi Day

Papa John’s

Buy one large or extra-large pizza at the regular price and get one for $3.14 today. You’ll need to be a Papa Rewards member, though.

California Pizza Kitchen

Spend $25 on anything at the restaurant and you can add an Original BBQ Chicken, Pepperoni, or Traditional Cheese pizza for $3.14. You’ll need to enroll in CPK Rewards or use the app to take advantage of the offer.

Marco’s Pizza

Get a medium one-topping pizza for $3.14 when you purchase a large or extra-large pizza. Use the code PIDAY.

Cici’s Pizza

Buy a medium or large one-topping pizza ad get another for $3.14. Cici’s also uses PIDAY as the coupon code.

Mountain Mike's Pizza

Mountain rewards members can get a free mini pizza with the purchase of a 20 oz. bottled beverage.

Blaze Pizza

Buy one 11-inch pizza and get a second for $3.14 today. And by taking advantage of the offer today, you’ll get a code for the chain’s app that give you another buy-one-get-one-for-$3.14 deal to be used later this month.

Grimaldi's Pizza

Don’t want a whole pie? Get a giant slices for $3.14 from 11 a.m. to 3 p.m. today.

Non-pizza pie deals

Perkins Restaurants

Not all the deals are pizza-related. Perkins customers can present their server with this coupon to get a slice of pie with the purchas of any entrée.

Famous Dave's

The BBQ chain is offering a free slice of Bakers Square pie to anyone who makes a $10 minimum purchase.

Village Inn

Get a free slice of pie with the purchase of an entrée and beverage

This story was originally featured on Fortune.com