# Category: Number Sense

## Storm cleanup

This activity could be used as an introduction to trig ratios.  Students figure out the approximate length of the huge branch that I have to fell for safety and firewood. After approximating the branch’s length, they calculate how many logs…

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…

## Budget 2012

Visit this debt clock website and ask students to make some observations, http://www.nationaldebtclocks.org/debtclock/unitedstates What do you see happening on this clock? When will the U. S. hit the next trillion dollars deficit milestone? How fast is the deficit increasing every hour?

## It sure is cold out … or is it?

Students ponder the relationship between place latitudes and average January temperatures while they try to discover a correlation. Is this a linear or near linear relationship? … averaging, missing data for averaging, line of best fit, Google Earth, world locations,…

## 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…

## All Star Game 2012

The NBA All Star game is being held on February 26th.  Did you know that this was the third major professional sport all star game in the last month. The Pro Bowl and the NHL All Star Game were also…

## Negative Exponents? Ugh

This activity/post is a little different than are usual posts.  We look at a particular math concept and consider how to use context, models and CCSS math practices to increase student understanding.  This activity focuses on negative exponents.  Even if you…

## Gumballs galore

Show Brian’s video to your class and let your students cogitate, estimate and calculate. Sheet with only a still shot from the video and room for figuring: gumball-image.pdf We have a solution of sorts for members below: gumball-solutions.pdf CCSS: 8.G.9,…

## The Euro and the international debt crisis

Lately the news is filled with talk of the Euro, US foreign debt, the fragility of European monetary systems, and the interdependence of all of these crisis. In this activity students become familiar with the Euro, practice translating the Euro’s…

## Largest Cup of Coffee Ever!

The world record for the largest cup of coffee was recently set (see picture above).  In this activity students explore scale, similar figures, volume and measurement as they estimate the amount of coffee that this record-sized mug holds.  Students also…

## Launch of the next ISS crew

If all goes well, the next crew of the International Space Station (the ISS) will launch on Sunday, Novemeber 13, 2011 from the  Baikonur Cosmodrome in Kazakhstan. Keep your student informed and excited about what is happening above our planet…

## Happy Birthday Statue of Liberty

Friday is the Statue of Liberty’s 125th birthday.  Student’s can practice scaling with ratios, multiplication factors, or similar figures as they engage in the news of the day, learn a little about the statue’s history, see some amazing old photos…

## Approaching Seven Billion people

To see the present world population, go here.  http://www.worldometers.info/world-population/ During the Fall 2011 the 7 billionth human on earth was born. The counter mentioned above gives updated approximations of the current world population.  When will we hit 8 billion people? …

## Occupy Wall Street protest is growing

The Occupy Wall Street (OWS) movement has grown since it began on September 17th.  Students can look at charts that show percent mentions of the demonstrations and calculate the percentage of media mentions, percentage of comment  growth, and the percentages…

## QR codes ???

Your students have probably seen these images around and might not know why they are becoming popular for smart phone scanning … and possibly dangerous.  Students figure out the number of permutations of symbols that are possible with these 2-d…