Category: Algebra

These posts help students see patterns and relationships.

I should have invested!

Students use yearly percent increase data to decide which stock: Apple, Disney or Amazon, they should have invested in way back in 2015.
What was the net gain of these stocks?
How do you figure that?
Does the arithmetic or geometric average of those increases equal their total gain or loss over the years?

Halloween spending 2021

Use our current data on Halloween spending in America to engage your students in an analysis of the ratios and percents of population, participation, and money spent in honor of October 31st. This activity takes kids through finding parts of wholes as well as ratio, percents and proportion problems.

Indigenous Peoples or Columbus Day

*** Two activities *** When Columbus landed in Guanahani (renamed San Salvador, Bahama Islands by Columbus), he began the European settlement of the New World. Guanahani was inhabited by the Taíno people and it wasn’t really a new world. In this…

Watson saves

Students use the Pythagorean Theorem with Ben Watson’s incredible tackle to figure out how far he must have run. Truly phenomenal play!

Fall Equinox 2021

Updated for 2021! Tuesday, September 22, 2021 at 19:21 UTC (which is the same as 3:21 am EST), will be the Autumnal Equinox.  It is the time of year when the imaginary plane that passes through the Earth’s Equator would also…

Monarch’s are flying south again

In mid-August and early September, the Monarch butterflies begin their annual migration south to more moderate climates to hibernate and overwinter.  It is an incredibly long migration and fascinating to observe.  But, the population data on the Monarchs has seriously…

Steepness and fall hiking

Combine colorful and cool fall hiking with a little mathematics about percent grade change. What is a steep grade? Why is it in percent? How does grade change relate to slope?

Hurricanes, Typhoons, and Cyclones

This is the season for increased cyclonic activity around the globe. Typhoons, Hurricanes, and Cyclones are measured with an Accumulated Cyclone Energy score (ACE). Does it correctly describe these events?

Just ONE hot dog

A newly released nutritional and environmentally sustainable study shows that eating just one hot dog can take 36 minutes off your total healthy lifespan. How many would you have to eat to lose a whole year of your lifetime?  How much did Joey Chestnut loose in the 10 minutes of Nathan’s annual contest?

Back to school activities

Who’s going back to school? – Students calculate the historical changes in U.S. population percentages of people who are going back to school and try to formulate reasons for these variations. 6.EE, 6.RP.3, 6.SP, 7.EE, 7.RP.3, 7.SP Does it pay to get…

Haiti’s earthquake and the Richter scale

On August 14th, Haiti was hit with a powerful 7.2 magnitude earthquake. What does a 7.2 magnitude earthquake imply? What’s a seismometer.  What is the amplitude of a seismograph and what does it mean? Use our Richter scale activity to introduce your students to logarithmic Richter magnitudes.

That’s a big tomato!

These Aussi tomatoes (the tomato on the left of all of the tomatoes) are huge.  How much do you guess one weighs? Can you figure it out?