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Topic: [math-learn] significant digits
Replies: 16   Last Post: Feb 28, 2002 7:49 PM

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Suzanne Alejandre

Posts: 113
Registered: 12/3/04
Re: [math-learn] significant digits
Posted: Feb 28, 2002 3:54 PM
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>I wouldn't round off - not at this stage. We always tell our students to
>retain all (or at least most) of their digits until they obtain the final
>answer, and to round off then. There is still another step - to convert to
>miles per hour.


But what if you're "done" with those calculations at that point,
because I was! I didn't convert ALL of those to miles per hour.
Instead I converted 25 miles per hour to meters per second and then
did my comparisons.

So, at that point would you round off? as I did in the chart I wrote
in an earlier message would you write them with 4 or 5 digits as I
did?

>And of course, they would need to retain the four signfiicant digit accuracy
>in the kilometres to miles conversion. Just using a value of 1.6, for
>example, will only give 2 significant digit accuracy in the answer.


Right. I would agree.

Suzanne

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