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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
Joe's Tiny New York
Joe's Tiny New York

Joe Macken is a truck driver from upstate New York. Back in 2004, when he was 41, he went into his basement with some balsa wood and started...

Number Sense Math and Art Grades 3–5
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
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
Pi Day Activities
Pi Day Activities

5 Activities for π day! What is π? The logic of finding the perimeters of inscribed and circumscribed polygons as the number of sides to the polygons increases....

Geometry Holidays and Annual Events Grades 3–7
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
Giant Pumpkins (2025)
Giant Pumpkins (2025)

🎃October is the time of year when giant pumpkin contests take place all over the world, and the pumpkins just keep getting bigger and bigger! In this activity,...

Number Sense Math and Food Grades 5–6
The greatest amount of chocolate
The greatest amount of chocolate

In this updated activity, students compare three chocolates that look almost the same size to see which one actually gives the most chocolate. Depending on their grade level,...

Math and Food Holidays and Annual Events Grades 2–6