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

2023-11-20 09:44:41

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


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'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. Begin the activity with a notice and wonder while looking at the wipes.  Then show the kids the list of items without the number of bacteria and have them take some estimates as to which are most and least disgusting in terms of bacteria per square inch.  They will be surprised by some of the numbers! This is also an excellent opportunity to deal with repeating decimals.

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


Download PDF Download Editable Files
Share this:
Comments (0)
    Display 1 - 10 Of total 0
    What do you know about the Hawaiian islands?
    We’ve been watching news about the ...
    How big of a crepe can you make?
    At Costco you can buy this huge tub of nutella...
    Giant iceberg breaks off from Antarctica
    The crack in Antarctica's Larson C ice she...
    Spiraling triples
    Let students explore the patterns of perfect squ...
    Thank you, mother and father, for all of those diapers
    Thank you Mother and Father for all of those diape...
    New Horizons spacecraft just flew by a really distant asteroid
    Brian May, the lead guitarist of the rock band, ...
    When will WORDLE run out of words?
    [caption id="attachment_41178" align="aligncenter"...
    December 21, 2020 - Great conjunction
    Right now, just after sunset, in the southwe...
    Patterns in the binomial expansion, Pascal
    Realizing that (X+Y)n can be expanded with the h...