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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...

Gonna be a Leap Year

Number Sense Math and Science Data and probability

By George C. Baxley This year we will add the 29th of February to our year? Why do we do that? How can you tell? What if we didn't add a day every 4 years? Stud...

Can this possibly be True?

Number Sense Math and Science

Could this possibly be true? What is reasonable? How do you check? Do you believe everything that you hear or read? Do you fact-check? While considering the veracity of this statement s...

Temperature change (Discussion Prompts)

Number Sense Math and Science

Note: This is not intended as a comprehensive activity with solutions. Instead, it serves as a discussion prompt. Have fun! It's been a crazy winter of extremes through much o...

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...

Cicada swarmaggedon

Algebra Number Sense Math and Science

Most of the life cycle of the Magicicada Septendecim is spent underground. Then at 17 year intervals, these cicadas emerge from the ground, climb deciduous trees, molt into a...

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...

Happy 14th B'ak'tun!

Number Sense Math and Science Math and Social Studies

Luckily, we’ve passed 12/21/2012 and the world is still here and we’ve made it into the start of the next Mayan calendar cycle ... the next B’ak’tun. The ancient Mayans had an interesting...

Curiosity landed on Mars