# Category: Algebra

## Jorge just turned 12. How old is he in human years?

My dog, Jorge, has just turned 12 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 84 year old human (12…

Let your students experiment with their graphing calculators to create a nice fireworks display?  We’ve written a brief activity that questions students about manipulating parabolas, adjusting their calculator windows, and helping them celebrate whatever. Or consider using Desmos or Geogebra to create these fireworks. Enjoy! Or…

## Saving Water Bottles

In my grocery store they now have these new water bottle refilling stations. You can simply refill your own container with water instead of buying a six-pack of bottled water. Do you think that this is a good idea?  Are they…

## Tick time and Lyme disease

With the start of summer and wonderful outdoor activities, it might be good to examine the growth of Lyme disease occurrences in the United States.  The Center for Disease Control and Prevention (CDC) has published maps for all of the…

## New Pirates of the Caribbean – How profitable?

The fifth Pirates of the Caribbean movie opened on Friday, May 26th. Your students might be looking forward to seeing this movie and motivated to understand the investment expenses and profit expectations. Our data and questions will help them judge this…

## Measuring sea level

What does this gizmo do? We’ve given students a diagram of what the interior of this mechanism contains and asked them to try to decide what its purpose must be. Then we’ve given them the data that was collected from…

## April’s calf was born!

At about 10:00 am, April 15th, April’s calf was born.  Everyone will be talking about it and smiling constantly. Here’s some fun math stuff to bring with you for Holiday gatherings. The activity:  April’s-calf.pdf

## YUMMY food for Passover

Passover will begin this year at sundown on Monday, April 10th. Jewish families will gather to commemorate the exodus of the Children of Israel from slavery in Egypt. The celebration begins with a traditional meal, the Seder, where the story of…

## What does 95% confidence in the poll results mean?

There were polls about who would win the Presidential election. Now there are polls about approval ratings for Congress and President Trump.  You can see the latest poll results here. I get so confused when polling results are reported.  What…

## Fun and crazy things to do for April Fools day

We have two classic puzzles for your April 1st class starters. PerplexingOne.pdf      PerplexingTwo.pdf CCSS: MP.1, MP3,4.OA, 5.G, 8.EE, 8.SP For members we have solutions. PerplexingOne-solution.pdf     PerplexingTwo-solution.pdf Or you might baffle and amaze your students with our Ghost Whisperer lesson.…

## Alarming ice cracks on Brunt Ice Sheet in Antarctica

A new, fast-growing ice crack is forcing the Halley VI British research station in Antarctica (shown above) to be moved.  Fear of a huge break-off from the ice sheet is alarming not just to the scientists on the station but to…

## New baby giraffe

Willow weighed 125 pounds at birth and was 6 feet 1 inch tall.  She will grow to her adult height of around 14 feet tall in only four years! How big would you be if you grew at her rate…

## In honor of Presidents’ Day find out about President’s pay

You can’t run for President now, but heck, 2036 is right around the corner. Being President of the United States will be quite an accomplishment and a ton of work.   But, how is the pay?  Does the job pay…

## How did I graph this heart?

What equations did I use to make this beauty? algebraic-heart CCSS: 8.EE, 8.F, HSA, HSG

## Getting a new iPhone – which plan should I choose?

I want to get an iPhone8 and maybe change my service plan.  Which of the above plans should I choose? Student pick one plan and consider the cost of the phone and plan over time.  They make tables, graphs and equations.  Consider…