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Shrinking Toblerone
Shrinking Toblerone

New York Times photo - Credit Darren Staples/Reuters They changed it. That is so not fair ... or is it? You can check out a video news story...

Number Sense Geometry Grades 5–HS
Pascal's Triangle coloring and Probability
Pascal's Triangle coloring and Probability

Pascal's Triangle and Probability - This activity could be used to explore the probability of coin tossing results. When the combinations get too complicated to list, students can...

Algebra Number Sense Grades 7–HS
Pokémon GO!  I should have invested
Pokémon GO! I should have invested

Pikachu Pokémon GO is all the rage. News reports show people glued to their smart phones as they travel to nearby landmarks where virtual critters appear and need...

Algebra Number Sense Grades 5–HS
Flag Art
Flag Art

A little ratio art might be a fun way to get ready for the upcoming Memorial Day holiday. In this activity (Flags) students measure; create whole number ratios...

Number Sense Geometry Grades 4–8
How did they figure these tips?
How did they figure these tips?

Act I: This restaurant bill has the suggested tips, but they are smudged out. What should they be? Consider having students make a fast 5 to 10 -second...

Number Sense Math and Social Studies Grades 6–8
Giant chocolate bunnies
Giant chocolate bunnies

What can you deduce about these bunnies from their descriptions ... solid? hollow? cost per pound? cost per height? Anything else? For Adventurer members we have an editable...

Number Sense Geometry Grades 6–7
Mark Zuckerberg and Priscilla Chan to give away 99% of their shares of Facebook
Mark Zuckerberg and Priscilla Chan to give away 99% of their shares of Facebook

That sounds like an awful lot of their Facebook shares. They want to help create a better world for their daughter, Max. I wonder if they will have...

Algebra Number Sense Grades 6–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 6–HS
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 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 6–7
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 6–HS
Mom's matzo ball soup
Mom's matzo ball soup

Passover is one of the three high holidays in the Jewish calendar and celebrates the Exodus of Jews from slavery in Egypt. Let your students review fractions in...

Number Sense Math and Food Grades 3–6