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Inflation and the cost of gasoline

Algebra Number Sense Math and Science Math and Social Studies Ratio and Proportion

In 1980, one gallon of gasoline costs $1.22. Today's prices are a lot higher. Is that because the price has gone up or because in 1980 you could buy a lot more than you can buy today for...

Is there much of a difference between 99.9% or 99.999%?

Algebra Number Sense Math and Science 3-act tasks Data and probability

Use our present need for cleanliness to engage your students. Does it really matter whether you kill 99.9% of the bacteria or 99.999% of the germs? In this activity, we'v...

Water saving toilets

Geometry Math and Science Ratio and Proportion Data and probability

How much water is used? How much water could be saved? For Adventurer members we have an editable Word docx and solutions with added world-wide information.

McDonalds moves towards antibiotic-free chicken

Number Sense Geometry Math and Science Math and Food Ratio and Proportion

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, Pa...

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...

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...

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