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How Many Donuts is That?
How Many Donuts is That?

Act One: Take a look at the first picture (Krispy-Kreme-photos). What is the first question that comes to mind? How many donuts is that? What information would be...

Number Sense Geometry Grades 3–6
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
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
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
Saffron and paella
Saffron and paella

In order to cook Paella (a delicious Spanish rice dish) I needed to buy Saffron spice. It was hugely expensive. So, I've decided to start a business of...

Algebra Number Sense Grades 4–HS
The growth of Godzilla
The growth of Godzilla

Image from Kris Holt: http://www.policymic.com/articles/76357/the-scary-way-godzilla-has-evolved-through-the-years-in-one-chart The new Godzilla movie is out at theaters. His first appearance was in 1954 when he was created in Japan and crushed Tokyo....

Algebra Number Sense Grades 4–HS
Cost of light bulbs
Cost of light bulbs

This activity has been updated (2026). See the new activity here: https://www.yummymath.com/post/light-bulb-cost-comparison/ There's a lot of misinformation out there about the cost to consumers of CFL and LED...

Algebra Number Sense Grades 4–HS
The Blue Marble
The Blue Marble

April 22nd is Earth Day. Use this activity to demonstrate the various mappings of our 3-d Earth to a 2-d piece of paper. Students compare maps with this...

Geometry Math and Science Grades 5–HS
Shamrock Shake
Shamrock Shake

For Saint Patrick's Day add a little nutrition math to your celebration. In this post we look at calories, carbohydrates, sugars, fats, and proteins to decide what would...

Number Sense Math and Science Grades 4–6
Scoring Olympic ski jumping
Scoring Olympic ski jumping

The scoring rubric for each of the Olympic events is intended to eliminate the possibility of scoring bias from the judges. Let your students learn more about the...

Number Sense Geometry Grades 4–HS
Which TV is the Best Deal?
Which TV is the Best Deal?

Check out the TVs. All have essentially the same features, only the size of the screen varies. Which TV do you think is the best deal? Explore area...

Number Sense Geometry Grades 3–6