Algebra

These posts help students see patterns and relationships.

Cell phone plans

Its time to go get the latest iPhone.  Which of the above plans will you choose?  Should you sign a 2-year contract on one of the above plans to get the iPhone for $200?  Or should you go through T-Mobile,…

Fall equinox

Tuesday, September 23, 2013 is the Autumnal Equinox.  It is the time of year when the imaginary plane that might pass through the Earth’s Equator would also travel through the center of the Sun.  At this auspicious moment the number…

Doubling your money

My friend and I were arguing about how long it would take me to double my investment amounts.  How will your students figure this out?  Are there any tricks?  Explore investing and exponential growth as your students discover “The Rule…

Fantasy Football

In the midst of another NFL season, we introduce students to Fantasy Football. Students first calculate football points given touchdowns, yardage gains and interceptions. They are then challenged to generalize an equation for that gives a player’s total fantasy points. Students…

Saffron and paella

In order to cook Paella (a delicious Spanish rice dish) I needed to buy Saffron spice.  It was hugely expensive.  So, I’ve decided to start a business of growing saffron and becoming immensely wealthy.

Back to school

In this investigation students calculate the percentage of the U.S. population (current and historically) that are enrolled in K-12 schools. They are asked to draw conclusions from these variations. Finally, they use their calculations to predict the number of enrolled…

Should I buy the BIG one?

 Let your students decide if the BIG one is a fair deal.  Click on the pic to enlarge and post on the wall.  Have kids a pick a sandwich.  Which size will they get?  Which size is a better deal?…

In the Cloud

I want to find a way to keep my photos, documents, videos and music in a place that is safer then on my computer.  If my Macbook Air melts, where can I keep my irreplacable files so that they aren’t…

Wheel of Theodorus

Bring a little art into your math class as you begin to use the Pythagorean theorem and your students first meet irrational numbers.

Millions of nematodes – How much would you pay?

Beneficial nematodes can kill destructive soil pests in your garden and lawn.  They are tiny worms that infect the grub and larvae phase of these insects and kill them.  To my surprise, a shipment of nematodes includes 10 million worms ……

Typhoon Neoguri approaching Japan

A powerful typhoon has just passed Okinawa, Japan’s southern-most prefecture, and is expected to continue to be very powerful.  What is a typhoon?  How are they scaled? In this activity students become aware of various storm rankings and severity as they…

Pizza Deals

Check out the new Flatizza from Subway. If the slice of pizza is from an 18-inch pizza cut into eight pieces, which deal is better when comparing area of pizza and cost?  How does the area of a square pizza…

July 4th and fireworks … on your calculator

Let your students experiment with their graphing calculators to create a nice 4th of July display?  We’ve written a brief activity that leads students with questions to manipulate parabolas, to adjust their calculator windows, and to help celebrate the Fourth.…

Games with dice

Time to let students become naturally curious about probability.  In this activity students work in teams to record the frequency of rolled dice combinations. They observe the difference between experimental and theoretical outcomes and consider how sample size affects how close…

The longest day

Sunrise on summer solstice at Stonehenge On June 21st, early Saturday morning, at 6:51 am EST, 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…