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All you can eat for 10 cents
All you can eat for 10 cents

The history of the Dairy Queen franchise began with this ad in Illinois in 1938: All the ice cream that you can eat for only 10 cents! We...

Algebra Number Sense Grades 4–7
National Donut Day (2 activities)
National Donut Day (2 activities)

Friday, June 5th, is National Donut Day . We have 2 activities to support this silly holiday. How much have doughnuts changed? Students become familiar with the word...

Algebra Geometry Grades 4–HS
NBA Finals 2026
NBA Finals 2026

Teams are competing in the playoffs, and the NBA Finals are right around the corner. Let's do a little sports history and data analysis through the context of...

Sports Ratio and Proportion Grades 5–7
Cost of light bulbs (Updated)
Cost of light bulbs (Updated)

With incandescent and halogen bulbs banned since 2023, students compare CFL, LED, and Smart LED bulbs, calculate energy use in kilowatt-hours, and determine which bulb is the better...

Math and Social Studies Ratio and Proportion Grades 5–7
The Game of GO
The Game of GO

In March 2016, Lee Se-dol, one of the world's best Go players, and Google's artificial intelligence program "AlphaGo" had their first match. (Watch the incredible Documentary ) Exactly...

Number Sense Math and Social Studies Grade 7
Rapunzel
Rapunzel

A live-action remake of Disney's Tangled is now in the works! In this updated activity, students use ratios and proportional reasoning to estimate the weight of Rapunzel's magical...

Movies and Entertainment Ratio and Proportion Grades 4–6
Big Bucks (Updated)
Big Bucks (Updated)

In 2025, Cristiano Ronaldo signed a jaw-dropping 2-year deal worth over $710 million, making him the highest-paid athlete per year in sports history. In this updated activity, students...

Sports Ratio and Proportion Grades 5–6
Peeps
Peeps

"How many Peeps do you think are sold for Easter in the U.S.?" In this updated activity, students start by making their own guesses for the number of...

Number Sense Math and Food Grades 4–7
The Last Great Race on Earth
The Last Great Race on Earth

The Iditarod Trail Sled Dog Race is an annual event in which mushers and teams of 12-16 dogs race across Alaska from Anchorage to Nome, in the cold...

Algebra Number Sense Grades 4–6
The Ultimate Key Lime Pie
The Ultimate Key Lime Pie

On a cold and snowy day in Boston about ten years ago, two chefs created a huge Key Lime pie to remind the frozen people of the Northeast...

Number Sense Geometry Grades 3–7
The huge costs behind the Olympics
The huge costs behind the Olympics

Hosting the Olympic Games is extremely expensive. In this updated activity, students explore the cost of hosting the Olympics, what a cost overrun (percentage increase) means, and how...

Algebra Math and Social Studies Grades 5–7
Holiday Candy Sales
Holiday Candy Sales

In this activity, students will analyze U.S. holiday candy sales percentage data (updated) to calculate the approximate amount spent on candy for each holiday. Students are encouraged to...

Number Sense Math and Food Grades 4–6