Category: Ratio and Proportion

Growth of Facebook update

Facebook is so accepted in our world today that it is even part of nightly news broadcasts as people are noted for receiving huge numbers of likes in appreciation or interest. Mark Zuckerberg, the founder and CEO of Facebook, is…

McDonalds moves towards antibiotic-free chicken

Recently McDonald’s announced that by 2016 they will use only chicken raised without the antibiotics that are used in human medicine.  McDonald’s plans to join Chick-fil-A, Panera Bread, Chiptotle, and Whole Foods in the move towards removing antibiotics in the…

Chili Con Queso

Act 1: Take a look at the promo at Moe’s.  What is the first question that comes to mind? How much does a 42-gallon jug of Chili Con Queso cost?  How many cups or bowls of Chili Con Queso is that?…

Which Sweet Hearts are the Best Deal?

 I have been doing a little shopping for Sweet Heart Candies. I came across these three deals online.  Which should I select?  In this activity students determine which package of Necco Sweet Heart Candies is the best deal.  Students are…

Losing team in the playoffs, 2015

Hey, the playoffs are about to begin.  The best teams from the leagues compete to determine the champion. Must be some really great teams! But wait, the 2014-15 Carolina Panthers made the NFL playoffs by winning the NFC South with a…

How much does a Lego cost?

This is a three act task, with an activity guide.  Show students the act one video.  What questions do they have?  How much could the Star Wars kit cost?  Follow the  activity guide, find costs based on the cost of…

Delicious pumpkin pie

I make the best, best, really best pie. Every year more and more people come to our house on Thanksgiving morning for my famous pumpkin pie and a hike in the nearby woods.  This year 23 people have already accepted.…

How much should you spend on this sale?

This activity can be used in a large range of grade levels.  Your class can work on percents, linear equations or piecewise functions. Act One: We missed the semi-annual sale but we want to get ready for the next one.  Let’s…

MAVEN arrives at Mars

Recently the MAVEN spacecraft (Mars Atmosphere and Volatile Evolution Mission) that was launched on November  18, 2013 reached Mars and attained an elongated orbit around the planet.  How does someone figure out how to do that?

The spread of Ebola in West Africa

Ebola is a deadly virus that has reappeared in Western Africa in an outbreak that began in February of this year.  We’ve supplied you with weekly statistics on the progression of this disease and given you and your students a…

Cheesy Goldfish crackers

In this activity students do a little comparison shopping as they determine which size Goldfish product is the best deal.  Students are introduced to the ratio table as a tool for determining equivalent ratios and comparing different rates.  Students graph cost per ounce relationships and answer a…

Typhoon Neoguri approaching Japan

A powerful typhoon has just passed Okinawa, Japan’s southern-most prefecture, and is expected to continue to be very powerful.  What is a typhoon?  How are they scaled? In this activity students become aware of various storm rankings and severity as they…

Cost of light bulbs – updated!

There’s a lot of misinformation out there about the cost to consumers of CFL and LED bulbs and the savings in energy and money that could be realized. Let your students “do the math” and realize some of the profit…

Green, green river

During the St. Patrick’s Day parade in Chicago, the local plumbers union dyes 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 the…