Category: Number Sense

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…

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…

How much pee is in this pool?

After chlorination, it has been hard to measure the quantity of pollutants in pool water.  A Canadian chemist, Xing-Fang Li, has found a marker for urine that chlorine doesn’t disguise. In this activity, students calculate volume of several pools, change that…

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…

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…

Tornadoes 2019

Tornadoes have devastated the Midwest, U.S. in the last few days. Alabama, Texas, Louisiana, Oklahoma, Ohio, Missouri, Iowa, Nebraska and Mississippi have been brutally hit with these powerful events. Involve your students in a better understanding of the ranking and…

NBA Finals, 2019

As the Raptors and the Warriors begin their NBA final games involve your students in some NBA analysis using graphical representations. In this activity students consider scatter plots, circle graphs, bar graphs, Venn Diagrams and the concept of mean. To…

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?

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…

Jorge is 14 years old now

My dog, Jorge, has just turned 14 years old.  He still seems like a puppy to me but I wonder how old he is when compared to a human’s age.  He’s definitely not like an 98-year old human (14 years…

Chocolate everything – Yum!

Just before Mother’s Day we thought a lot of chocolate play might be timely. Big Snickers bar – 3-act task; How much bigger than a regular Snickers bar is that? CCSS: 4.MD.A, 5.MD.C, 6.G.A, 6.RP.A, 7.G.1, 7.G.6, 7.RP.A