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Betsy Ross's 5-pointed star
Betsy Ross's 5-pointed star

Flag of the United States from 1777 to 1795. In honor of Independence Day we thought it would be fun to look at one story about the first...

Algebra Geometry Grades 4–HS
Penny Wars anew
Penny Wars anew

Act One: Check out all of the pennies! What questions come to mind? If you want the most money, which container should you pick? What information do you...

Geometry 3-act tasks Grades 7–HS
Do caffeinated drinks have similar amounts of jolt?
Do caffeinated drinks have similar amounts of jolt?

We found this interesting caffeine infographic at visual.ly. Wonderings? How many McDonalds coffees do I need to get the same amount of caffeine that I would get in...

Geometry Math and Science Grades 6–HS
Tree for Springtime
Tree for Springtime

Here in the Northeast, flowers are blooming and trees are leafing out. We thought the creation of a tree that grows before your eyes might be akin to...

Algebra Geometry Grades 3–HS
Shoprite's solar energy goals on the African continent
Shoprite's solar energy goals on the African continent

Shoprite is the largest supermarket chain in Africa. The company is presently engaged in increasing their use of solar power to harness the abundant natural resource of solar...

Algebra Geometry Grades 3–6
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
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
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
Can you show that the Pythagorean Theorem works?
Can you show that the Pythagorean Theorem works?

Use this activity to help your students work through the meaning of the Pythagorean theorem. Pythagorean theorem experiences are often skill and drill work with contrived right triangle...

Algebra Number Sense Grades 5–HS