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Will our U.S. flag change yet again?
Will our U.S. flag change yet again?

How many stripes are in our present flag? (The bottom right flag that has been in use since 1960; See the PowerPoint) How many stars? What do the...

Algebra Geometry Grades 2–5
Man paid in 500 pounds of greasy pennies!
Man paid in 500 pounds of greasy pennies!

A man from Georgia, Andreas Flaten, finally received his last paycheck from his disgruntled employer. He had been owed that last check for several months and was having...

Algebra Number Sense Grades 4–6
John Urschel, retired Baltimore Raven and Black mathematician
John Urschel, retired Baltimore Raven and Black mathematician

John Urschel is a young man with several seemingly disparate characteristics and talents. He is an athlete and a mathematician and he is a black man and a...

Number Sense Math and Social Studies Grades 2–HS
At least the days are getting longer
At least the days are getting longer

What's your guess? How fast are the number of daylight hours changing each day? Are the changes dramatic or subtle? Students make guesses; compute how long, on average,...

Algebra Number Sense Grades 4–7
How should I spend my rewards?
How should I spend my rewards?

There's a new way to earn rewards at many grocery stores. For every dollar that you spend, you accumulate points. Then there are special rewards where you earn...

Algebra Number Sense Grades 4–7
Crazy basketball score
Crazy basketball score

Wow! Look at that score! There were some scoreboard malfunctions in this December 15, 2020, pre-season game. What might have been the final score if this game progressed...

Algebra Number Sense Grades 2–6
Inauguration Date
Inauguration Date

The date of the Presidential Inauguration this year can be written in an interesting way. What do you notice? What do you wonder? Do you think that this...

Algebra Number Sense Grades 3–HS
December 21, 2020 - Great conjunction
December 21, 2020 - Great conjunction

Right now, just after sunset, in the southwest sky, you can check out the planets of Jupiter and Saturn as they get closer and closer to each other....

Algebra Number Sense Grades 3–HS
Ravensburger huge puzzle
Ravensburger huge puzzle

 This puzzle is gorgeous and HUGE! Ravensburger says that if you spent 2 hours every day putting this puzzle together it would take you a year to...

Number Sense Geometry Grades 3–7
Is the Electoral College fair?
Is the Electoral College fair?

Show your students this really cute segment comparing how the Electoral College functions in our elections to what students think is fair and just. From the New York...

Number Sense Math and Social Studies Grades 5–HS
Monster cake
Monster cake

Jodie Berman, a high school math teacher in Chicago, loves mathematics and loves to cook. We've created an activity based on her Monster Cake (composed of everything that...

Number Sense Geometry Grades 3–6
How much chocolate is left?
How much chocolate is left?

In this short activity, students reason and calculate what is left of these chocolate bars. The bars are the same size but are molded into different numbers of...

Algebra Number Sense Grades 3–5