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Tiny vacuum with a huge reach
Tiny vacuum with a huge reach

From the vacuum description and advertisement in the PDF, how long do you think its cord must be? Thanks to Brian Shoemaker, Newton, MA teacher, for the idea...

Algebra Number Sense Grades 5–HS
Microns and Masks
Microns and Masks

How big is one coronavirus? How big is a micron? How well do these masks protect against the virus? What can you observe about the size of particles...

Algebra Number Sense Grades 3–HS
Stock Market headlines - Biggest losses since 2008
Stock Market headlines - Biggest losses since 2008

This year the Dow Jones Industrial Average made headlines as it dropped in March and April. The Dow is measured in points but this decline can also be...

Algebra Number Sense Grades 5–HS
Hoarding stopped!
Hoarding stopped!

A Danish market found an interesting way to limit hoarding of hand sanitizer. How much are these costs in your currency? What is the unit price on these...

Current events Ratio and Proportion Grades 5–HS
How many delegates does each state get to send to the Democratic Convention?
How many delegates does each state get to send to the Democratic Convention?

Texas gets to send a lot more delegates to the July National Democratic Convention than New Hampshire does. How do they figure out what each state's fair number...

Number Sense Math and Social Studies Grades 5–HS
K-Pop and BTS, how much can they earn from Youtube and Spotify?
K-Pop and BTS, how much can they earn from Youtube and Spotify?

Bring a little K-pop music to your class with this activity. Jason Kibbe, a terrific middle school math teacher in Chambersburg, PA , sent us an activity that...

Number Sense Math and Social Studies Grades 2–6
How many Smashburgers?
How many Smashburgers?

Egad! There must be a million ways to craft one of these burger! How many ways do you think that there are? Act I - Study the menu...

Algebra Number Sense Grades 6–HS
So just print some more money!
So just print some more money!

What's the big deal with our deficit? Do we actually borrow money to cover our debt? If we do, imagine the interest charges? Help your students (and their...

Number Sense Math and Social Studies Grades 5–HS
Stacking Jack
Stacking Jack

Act One : Check out the video slide show. What questions do you have? Suggested Question: How many different ways can I stack Jack? That is, how many...

3-act tasks Data and probability Grades 6–HS
What's the answer?
What's the answer?

Image by Twitter user @pjmdoll. Math doesn't usually create a buzz on Twitter. This past week this post did just that. People argued online about whether the answer...

Algebra Number Sense Grades 4–HS
Bears Ears revisited
Bears Ears revisited

There is some beautiful land in Utah that was changed last year from federally protected land to Utah overseen land. The buttes of Bears Ears (shown above) and...

Math and Social Studies Current events Grades 5–HS
Louisiana
Louisiana

We recently watched the approach of Hurricane Barry and worried about the fate of Louisiana. After the devastation of Hurricane Katrina, what would another powerful hurricane do to...

Algebra Number Sense Grades 4–HS