Ratio and Proportion

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Are these really 70% off?

Algebra Number Sense Ratio and Proportion
We ran into this sale online. Is that advertisement correct?  Do they just want us to believe their math and not question what is really 70% off?  Is everything or...

Mark Zuckerberg and Priscilla Chan to give away 99% of their shares of Facebook

Algebra Number Sense Math and Social Studies Ratio and Proportion
  That sounds like an awful lot of their Facebook shares.  They want to help create a better world for their daughter, Max. I wonder if they will have enough left over to live on? The...

Growth of Facebook update

Algebra Number Sense Ratio and Proportion Data and probability
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 f...

How much should you spend on this sale?

Algebra Number Sense Ratio and Proportion 3-act tasks Data and probability
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...

Raising the bar

Algebra Number Sense Math and Science Ratio and Proportion
Recovery of the treasure from the 1941 sinking of the S.S. Gairsoppa was recently completed and a huge amount of silver was brought up from the ocean floor.  Let your students get a fe...

Cruising

Algebra Number Sense Math and Science Math and Food Ratio and Proportion Data and probability
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 need...

Voyager on the edge

Algebra Number Sense Math and Science Ratio and Proportion
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 m...
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