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Thank you for all of those diapers
Thank you for all of those diapers

Which is a better deal, cloth or disposable diapers? How much did you cost your parents in diapers? In the future, how much could your kid's diapers cost?...

Algebra Number Sense Grades 6–8
Cost of light bulbs
Cost of light bulbs

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...

Social Studies Ratio and Proportion Grades 6–8
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 Social Studies Grade 8
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 5–8
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 4–8
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 4–8
Lunar New Year 2026
Lunar New Year 2026

The 2026 Lunar New Year falls on Tuesday, February 17. In this updated activity, students will explore the unique naming system of the Lunar New Year, which combines...

Number Sense Holidays and Annual Events Grades 4–7
Valentine's Day Activities (List)
Valentine's Day Activities (List)

Celebrate Valentine’s Day with our activities: Have a heart (Canstruction) Students use reasoning and approximation to analyze the number of cans of food contained in this one giant...

Holidays and Annual Events Grades 3–8
The Most Expensive 30 Seconds
The Most Expensive 30 Seconds

This year, the 30-second Super Bowl ads will cost about 8 million dollars! Do you wonder how much one ad will cost next year? In 5 years? In...

Algebra Sports Grades 8–HS
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 6–8
Groundhog Day
Groundhog Day

On Groundhog Day (February 2nd), Punxsutawney Phil will again, with great ceremony, come out of his burrow and look for his shadow. In this updated activity, students will...

Holidays and Annual Events Data and probability Grades 6–8
Super Bowl Numerals
Super Bowl Numerals

Super Bowl numbers are appearing again! As students start getting into the current Super Bowl hype, help them to understand the notation that the sports writers and advertisements...

Number Sense Sports Grades 5–8