Number Sense

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How much have doughnuts changed?

Algebra Number Sense Geometry Math and Food
Part of the Smithsonian's Sally L. Steinberg Collection of Doughnut Ephemera -- Click on the image to see it larger. When you are working on volume in your class, you can use this activi...

Free Flights?

Algebra Number Sense
This can't be right!  If my flight cost $200 and I stayed for 10 days it would be free.  Right?  You can kick off this activity by asking students to think about where ...

What's with the plovers?

Algebra Number Sense Math and Science Ratio and Proportion Data and probability
Cute little birds.  Piping plovers are nesting on beaches along the Atlantic coast. Consequently beaches are often roped-off or closed to protect their nests and chicks. Is this conservatio...

Deflategate

Algebra Number Sense Sports
  The deflated ball controversy makes an interesting segue into negative number line understanding.  A particular digital psi football gauge reads 0 when the ball is at a proper NFL in...

Cost of light bulbs - updated!

Algebra Number Sense Math and Science Math and Social Studies Ratio and Proportion Data and probability
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 realiz...
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