Category: Algebra

These posts help students see patterns and relationships.

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 this fragile state? What is it about Louisiana that causes so much…

All-you-can-eat ice cream … 10 cents!

All the ice cream that you can eat for only 10 cents!  Wow, that’s a great deal!  How great a deal was that? The history of the Dairy Queen franchise began with this ad in Illinois in 1938.  I know…

How can Nike give away so much great stuff?

Worldwide Nike supports many teams and athletes.  They design, manufacture, and supply gear for almost every sport imaginable. How much are those give-aways worth?  Is the company going to go broke? Probably not.  Nike is huge. In this activity we…

California earthquakes and the Richter Scale

After a July 4th 6.4 magnitude earthquake, California experienced 7.1 magnitude quake two days later. Many more quakes and aftershocks are expected. The IRIS (Incorporated Research Institute of Seismology) Seismic Monitor will allow your class to visualize the most recent quakes and their…

Betsy Ross’s 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 American Flag. The rough design of the flag was drawn by a…

The longest day

On Friday, June 21st, at 11:54 am EDT, the Earth’s North Pole will be tilted as far towards the Sun as it will ever be in the year.  This marks the longest day of the year in the Northern Hemisphere and…

Spiraling squares – compass and straight edge

Can you see the many spirals in this design? Students calculate the size of each increasing round of squares and consider what sort of spirals these must be. The activity: SpiralingSquares.pdf Working with a little mathematical art is a great…

How many baseballs are in this truck?

To see this poster larger in a new window, click on the image. In 2017, Old Dominion Freight Line offered 2 free tickets to the next 3 World Series to the person who guesses closest to “How many baseballs are…

NHL Playoff games can sure last a long time!

Revised! We’re watching another Stanley Cup playoff now. Will there be any really long games during the playoffs? In 2013, a Stanley Cup playoff match between the Bruins and Blackhawks went into 3 overtimes. People stayed up way too late…

Memorial Day, 2019

This Monday Americans will celebrate Memorial Day.  Who are we honoring?  How did the holiday come about?  Isn’t Memorial Day usually on May 30th? Students learn a little about the history of the holiday, analyze the possibilities and patterns for when…

Wow, everything must be free!

What happens when you take 50% off again after taking 50% off at first? Students examine this retailer trick of giving double discounts.  What happens to the price when you are given a double discount?  Could everything be free?

Watson saves

Just announced!  Ben Watson is coming back to the Patriots!Ben Watson played for the Patriots at the beginning of his career.  Then he joined the Cleveland Browns, the New Orleans Saints, and the Baltimore Ravens. Now he’s coming back to…

How much water should you be drinking?

As outdoor activities get into full swing and the temperatures rise, it might be a good time to look at hydration. A healthy requirement for fluids can’t really be the same for everyone.  Surely the amount of water that you…

Bring Mothers’ Day math to your class!

Mother’s Day by the numbers – Mother’s Day is right around the corner and this means big business for the greeting card and floral industries. Let your students practice averages, percents, and large numbers while they analyze the statistics on Mother’s…