# Category: Geometry

## Lego Fireman +

Students use our lego measurements to underestimate and over estimate this giant firefighter’s construction time and LEGO block quantity. Then students average their class estimates and compare to the real time and and quantity.

## Autumnal Equinox 2023

Saturday, September 23, 2023 at 06:50 UTC (2:50 am EST), will be the Autumnal Equinox.  It is the time of year when an imaginary plane would pass through both the Earth’s Equator and the center of the Sun. We have 3 activities to use during this event.

## Women’s World Cup – How many matches are left?

The first round of Group play has finished and now the remaining teams start the second round of play. The teams have already played a lot of matches.  How many? And, how many matches are left?

## 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…

## How many times bigger?

Listen to students initial thoughts as they wrestle through what “bigger” means … length? height? wheel-base? volume? Come up with guesses that are too high and too low. Show that the average of guesses is pretty close to actual.

## The 4th of July

Flag art, creating a 5-pointed star with one cut, fireworks on your calculator, hot dog eating contest, and a possible new, 52-star flag.

## 200 people

Let your students ponder this gif in full screen and then let them share what they notice and why this gif might have been created.

## It’s almost summer now

How much water should you drink? How much pee is in this pool? How has the presence of lyme disease changed? Which is the best drink deal at the fair?

## Giant beach towel

Check out this beach towel!  What do you wonder? What would you like to know?

## Mother’s Day ideas (14 activities)

Updated! How much do we spend on Mother’s Day – Use the Mother’s Day event to engage your students in approximating, reasoning, and investigating as students estimate how much is spent in the United States for Mother’s Day. For what…

## 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.

## The HAT tessellation

An Einstein aperiodic tile has just been discovered.  Find out what that means and why it is significant.  Plus – play with the tiles.  Do you want to tile your shower floor with these?  Could a tile setter pull this off?

## Earth Day actions for our planet

We have 16 activities that you could use for Earth Day! Saturday, April 22nd is Earth Day. Help your students become activists for our planet? We have 16 activities that support recycling, conserving resources, awareness of climate change and protecting our planet.…

## Challenges for April Fools Day

This day is known for pranks and puzzles.   Try one of these 4 activities on April Fools Day. Ask students to analyze where I made my mistake        PerplexingProblem.pdf For members we have solutions. PerplexingProblem-solution.pdf      …

## How hard is it to find a 4 leaf clover? (3 Saint Patrick’s Day activities)

We have 3 Saint Patrick’s Day activities for your math class. How hard is it to find 4-leafed clovers, the nutritional values of a Shamrock Shake, and measuring parts per million (ppm) of dyeing the Chicago River green.