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How much have doughnuts changed?
How much have doughnuts changed?

Part of the Smithsonian's Sally L. Steinberg Collection of Doughnut Ephemera -- Click on the image to see it larger. When you are working on volume in your...

Algebra Number Sense Grades 7–HS
How Much is a Tweet Worth?
How Much is a Tweet Worth?

These days it seems everyone is on social media. Are you? Famous athletes and entertainers are on social media and they can make a lot of money. In...

Algebra Number Sense Grades 5–HS
Free Flights?
Free Flights?

This can't be right! If my flight cost $200 and I stayed for 10 days it would be free. Right? You can kick off this activity by asking...

Algebra Number Sense Grades 6–HS
What's with the plovers?
What's with the plovers?

Cute little birds. Piping plovers are nesting on beaches along the Atlantic coast. Consequently beaches are often roped-off or closed to protect their nests and chicks. Is this...

Algebra Number Sense Grades 6–HS
Growth of Facebook
Growth of Facebook

In this activity, students analyze and graph the numbers and decide if Facebook's growth in the first 20 years has been linear, exponential, meteoric, or something else. Will...

Algebra Number Sense Grades 6–HS
California water measurements - chains, links, and furlongs
California water measurements - chains, links, and furlongs

Help your students understand what they are reading or hearing about the California drought. Terms like acre-feet, chains, and furlongs are often used to describe the volume of...

Algebra Geometry Grades 4–7
Which Sweet Hearts are the Best Deal?
Which Sweet Hearts are the Best Deal?

I have been doing a little shopping for Sweet Heart Candies. I came across these three deals online. Which should I select? In this activity, students determine which...

Algebra Number Sense Grades 5–6
Clean Close Shave
Clean Close Shave

Take a look at the infographic. What do you see? What do you think? What do you wonder? [caption id="attachment_16099" align="aligncenter" width="420"] Image from West Coast Shaving. Clicking...

Algebra Grades 3–HS
Deflategate
Deflategate

The deflated ball controversy makes an interesting segue into negative number line understanding. A particular digital psi football gauge reads 0 when the ball is at a proper...

Algebra Number Sense Grades 5–HS
How much does a Lego cost?
How much does a Lego cost?

This is a three act task, with an activity guide. Show students the act one video. What questions do they have? How much could the Star Wars kit...

Algebra Number Sense Grades 5–6
Kilauea's lava flow
Kilauea's lava flow

[caption id="attachment_15749" align="aligncenter" width="500"] Halema‘uma‘u Lights the Morning Sky - Photo taken from the overlook by the Volcano House on January 30, 2014 - NPS photo[/caption] The volcano,...

Number Sense Geometry Grades 4–7
How large a TV should I get?
How large a TV should I get?

Whether you are in middle school or high school, someday you are going to be moving out and you might need to select the right size HDTV for...

Algebra Number Sense Grades 4–6