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Fast Growing Plant
Fast Growing Plant

Students look into a plant that doubles in height every month and work out a rule for its height at any point, then run that rule backwards to...

Algebra Number Sense Grade 7
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
Thank you, mother and father, for all of those diapers (Updated)
Thank you, mother and father, for all of those diapers (Updated)

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 5–7
Hybrid, Electric or Gasoline
Hybrid, Electric or Gasoline

Gas prices are up, EVs are everywhere, and hybrid technology keeps improving! So which car is better? Which car would you/your family choose? Students compare the latest prices...

Algebra Number Sense Grades 6–7
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
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
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 3–6
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 7–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 5–7
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 4–7