Tag: proportion

Glowing rectangles

People spend lots of time staring at their screens (glowing rectangles).  Kids spend hours each day using their cell phones, computers, tablets, television and more.  Use that interest to motivate your student’s analysis of screen ratios and what proportions they…

How much can my DVR record?

How many hours of HD video can my DVR strore? How about SD video? I love my DVR.  I can record my shows and movies and watch them whenever I want.  I know that when I record HD programs my…

How Old Are You?

We usually give our ages in years, but that isn’t very precise is it?  In this activity students find their age in days, hours and minutes.  First students take two minutes to estimate their age in days, hours and minutes.…

Big Burger

In honor of International Hamburger Day (May 28, 2015), it’s time to treat your students to ratios, proportions, fractions and BIG BURGERS! In this activity students explore the ratio of the various ingredients in the world’s largest burger (pictured above &…

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…

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…

An ounce of cola

Which is more expensive; gasoline? milk? or cola?  Students calculate the per ounce cost of each of these liquids in a story about a man doing errands.  After finding the per ounce price, students find costs of gasoline, milk and…

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…

Where have all the flowers … come from?

Thursday, February 14, 2019, is Valentine’s Day.  Start the “love hoopla” with this graphic on where all of the flowers come from.  This is part of the graphic from http://visual.ly/valentines-day-facts What fraction of these roses are shaded red?  The red ones…

HDTV Surprise!

How were your holidays?  Your school vacation?  Mine was good. I surprised my family with this HDTV, which I wrapped and hung on our wall.  The size of an HDTV is determined by the length of its diagonal. What size…

Cruising

There have been a lot of cruise ship mishaps and disasters this year. While these are in the news, let your students consider how these floating cities manage their resources and which of their needs are precarious as they calculate…

Voyager on the edge

The two Voyager space probes are in the news recently as they approach the edge of our solar system.  Scientist can tell that the Voyager’s environments are changing.  They are receiving more high-energy particles streaming

Starbucks, 2012

Time to give students some authentic math on a topic they will surely be interested in … Starbucks.  We ask and answer a few questions in this activity. About how many drinks does Starbucks sell in a year? If I…

Video game download

How long will it take me to download the video game? This can be done as a 3 Act Task.  To get started simply show the video and following picture to your class. ACT ONE: I decided to download a…

Linsanity

Jeremy Lin is the New York Knicks most startling player.  His story is exciting in that he graduated from Harvard in 2010 and was not immediately drafted into the NBA.  At first he was playing in the NBA Development League…