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How many cars are there?
How many cars are there?

Brian came home from work to find that his son had his toy cars organized in a tight parking lot on our front porch. ? Below is a...

Number Sense Geometry Grades 2–4
Saving Water Bottles
Saving Water Bottles

In my grocery store they now have these new water bottle refilling stations. You can simply refill your own container with water instead of buying a six-pack of...

Algebra Math and Science Grades 7–HS
Proposed southern border wall
Proposed southern border wall

You have probably heard about the proposed border wall that may go up along the U.S./Mexico border. How much wall needs to be built? How much will that...

Number Sense Math and Social Studies Grades 4–6
A gorgeous, glittery card
A gorgeous, glittery card

Uh oh! How do you find the area of a heart? Get your students to help you calculate how many sequins you'll need to order for this class...

Number Sense Geometry Grades 2–7
Measuring sea level
Measuring sea level

What does this gizmo do? We've given students a diagram of what the interior of this mechanism contains and asked them to try to decide what its purpose...

Algebra Number Sense Grades 5–HS
Giant iceberg
Giant iceberg

Ferryland, Newfoundland. JODY MARTIN / REUTERS This giant iceberg drifted past Ferryland, Newfoundland in 2017. It's hard to tell how large it actually is, but it looks huge....

Number Sense Geometry Grades 4–HS
Patriots' Day
Patriots' Day

We celebrate Patriots' Day to commemorate the beginning of the Revolutionary War and the battles of Lexington and Concord. Students learn more about the difficulties of the Revolutionary...

Number Sense Math and Social Studies Grades 4–7
What does 95% confidence in the poll results mean?
What does 95% confidence in the poll results mean?

There have been a lot of polls about who will win the Presidential election. I get so confused when polling results are reported. What is a 95% confidence...

Algebra Number Sense Grades 7–HS
Alarming ice cracks on Brunt Ice Sheet in Antarctica
Alarming ice cracks on Brunt Ice Sheet in Antarctica

A new, fast-growing ice crack is forcing the Halley VI British research station in Antarctica (shown above) to be moved. Fear of a huge break-off from the ice...

Algebra Number Sense Grades 5–HS
How did I graph this heart?
How did I graph this heart?

In this activity, students will use mathematical equations to create a heart shape on a coordinate plane. This activity encourages students to apply their algebra and graphing skills...

Algebra Geometry Grades 7–HS
Have a heart
Have a heart

Clicking on the image above will show the heart larger in a new window. Canstruction® is an event hosted in more than 150 countries throughout the world to...

Number Sense Geometry Grades 4–HS
Super Bowl cheesy pretzel poppers
Super Bowl cheesy pretzel poppers

Recipe courtesy of The Slow Roasted Italian A little more delicious work for the Super Bowl. Students follow a recipe that involves "cutting the cheese" block, figuring how...

Number Sense Geometry Grades 4–6