Killing bacteria

Use the need for cleanliness during flu season to engage your students.

Clicking on this image will show it larger in a new window.

Does it really matter whether you kill 99.9% of the bacteria or 99.999% of the germs?

In this 3-act activity we've asked students to consider whether these claims about these two wipes' efficacy really make a difference.  We've supplied students with a list of bacteria counts on various surfaces and asked them to calculate how much of a difference these two different percents make in wiping out germs.

This is an excellent opportunity to deal with repeating decimals.  Thanks to Kyle Berry for sharing this image with us!

The Activity: KillingBacteria.pdf

CCSS: 5.NBT.3, 5.NBT.7, 6.NS.3, 7.NS.2.d, 8.NS.1

For members we have an editable Word docx, an Excel sheet with data and calculations, and solutions.

KillingBacteria.docx    bacteria-count.xlsx    KillingBacteria-solution.pdf





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