Category: Geometry

How many cars are there?

I came home from work to find that my son had his cars organized in a tight parking lot on our front porch. How many cars are there? Is it an array and if so, what size array could it be…

How much pee is in that 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…

Mother’s Day activities

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…

A gorgeous, glittery Mother’s Day card

Uh oh!  How do you find the area of a heart? Get your students to help you calculate how many sequins you’ll need to order for this mother’s day class project. The activity:   BejeweledMother’sDayCard.pdf Mother’sDay-card-blank – If you want…

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…

Giant iceberg

Over the past Easter weekend this giant iceberg drifted passed Ferryland, Newfoundland.  Its hard to tell how large it actually is but it looks huge.  Use some of the data that was supplied and your estimation skills to gauge the…

Earth Day, 2017

Saturday, April 22nd is Earth Day There is so much to bring to your classroom to support recycling, conserving resources, studying climate change and protecting our planet. McDonald’s moves toward Antibiotic-free chicken – What will the effects be on costs at the restaurant, costs in…

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.…

Pascal coloring and modular math

This is the third and final activity in the Pascal’s Triangle series.  In this activity students again have the opportunity to color as they investigate Pascal’s triangle and the patterns that it shows.  The activity might be used first in…

Saint Patrick’s Day, March 17th

Green, green river – They’re doing it again. In Chicago, the local plumbers union “dye” the Chicago River emerald green.  Students learn what PPM (parts per million) means and  attempt to figure out how much dye is used to sufficiently color…

Pi Day is coming!

Celebrate π in your school and in your math class with activities that demonstrate how π was derived; visually show why π makes sense; show a surprising place where π is used; increase students ability to measure and long divide; applauds the talent of…

Valentine’s Day activities

Chocolate-raspberry heart-shaped cake – Students build a heart cake and use ratio information to find the quantities of cake and icing resulting from increased dimensions. A parametric heart … with love – Students use unit triangles and manually calculate sine and cosine…

Have a heart

Clicking on the image above will show the heart larger in a new window. Canstruction® is an event hosted in more than 150 countries throughout the world to demonstrate “innovation, hunger relief  and collaboration”.  Canstruction has raised more than 40 million…