Category: Ratio and Proportion

Hoarding stopped!

A Danish market found an interesting way to limit hoarding of hand sanitizer. How much are these costs in your currency? What is the unit price on these bottles? By how much (what percent) was the price increased? Is this…

Data remaining … tricky

I checked my data usage for the month.  What do you notice and wonder?   What could my data plan be? How much have I used? How much will I have used by the end of the month? Is this…

Celebrate Saint Patrick’s Day (3 activities)

Finding 4-leaf clovers! Shamrocks in Ireland are actually be 3-leafed white clover, trifolium repens. If you are lucky, you can sometimes find a four-leafed clover.  How rare is finding a 4-leafed clover?  How hard do you have to look?  What…

It’s time to gear up for Pi Day

Seattle, Washington Pi sculpture

8 activities to help celebrate π in your school and in your math class. 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 people who can memorize large strings of numbers; and lets students just have fun.

Which gasoline is the cheapest?

A comparison of gasoline in Greece, priced at Euros per liter, and gas in Massachusetts at dollars per gallon. Price and liquid volume conversion using unit fractions.

Iditarod – The Last Great Race

The Iditarod Dog Sled Race will begin this year on Saturday, March 7th in Anchorage, Alaska. It is often called The Last Great Race on Earth because it is so long and grueling. Students do some rate, distance, and hardship comparisons to decide…

Mardi Gras or Fat Tuesday

Students get a chance to examine the monetary and environmental cost of this bead exuberance with our unit pricing and recycling activity.

Sweetheart candies are back … sort of

How many dollars worth of sweet hearts candies used to be sold each Valentine’s season?  Let your students taste the candies while they do the math. Student learn of the pain of a new manufacturer.  They practice problem solving, critical thinking, and number sense reasoning?

Movies and the upcoming Oscars

Compounded percent change; central tendencies; the weight of Rapunzel’s 70 feet of hair; Godzilla’s height by comparison; how to measure the profitability of a movie series; most appropriate graphical representations; line of best fit; and more …

Super Bowl and Ground Hog day (9 activities)

+ Even more NFL math! Super Bowl ads and scientific notation  Updated! – On Monday, when the Super Bowl is over and all of the ads have been seen, use this scientific notation activity to involve math students in the talk of…