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At 01:48 AM 5/31/01 +1000, you wrote:

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I first look and see how many digits my answer needs to have. I then carry

one extra digit

than needed and just drop the other digits. Unless I have a function

involved (like sin, cos,

e, LN, pi, etc), I carry all digits for the number associated with the

function. When all of

the calculations are done I use that last extra digit to decide whether or

not to round up

the final answer. If the last digit is 5 or greater I round up the next digit.

Of course there are tons of books on precision, accuracy, and error

calculations if you

really want something set down in writing as a reference. ASTM I know has a

section

on proper significant figure use. Measurement theory textbooks usually

contain a chapter

on proper rounding as well.

_____________________________________________________________

Cris Wilson

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College of Architecture, Arts, and Humanities

Clemson University

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