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Smokeboat Dave View Drop Down
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    Posted: 30 Oct 2017 at 6:30pm

  I can't remember how I got here, but I do remember that in high school physics class I was taught to "round to even".

        I also don't remember how ET"A" school, Nuclear Pwr Sch or Central Navigation Computer school taught the subject.

        How were you taught in your halls of higher learning?

        https://en.wikipedia.org/wiki/Rounding


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Dr. Stan View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dr. Stan Quote  Post ReplyReply Direct Link To This Post Posted: 31 Oct 2017 at 3:57pm
For decimals:  Above 5, round up.  Below 5, round down.

Originally posted by Wikipedia Wikipedia wrote:

Round half up & Round half down
https://en.wikipedia.org/wiki/Rounding#Round_half_up
It has been my experience that folks who have no vices have very few virtues.~Abe Lincoln
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Flapper Quote  Post ReplyReply Direct Link To This Post Posted: 03 Nov 2017 at 2:24pm
for hair-splitters: 1.00 - 1.49 rounds down to 1.00, 1.50 - 1.99 rounds up to 2.00.

Way back (early 60's) most calculating was via slide-rule, and the rounding rule was '~ +/-3 to the third place.' Studies had shown that was the visual resolution limit for 3-digit numbers. Learned that in ETA and re-enforced in nuke school.
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whalen View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote whalen Quote  Post ReplyReply Direct Link To This Post Posted: 05 Nov 2017 at 3:11pm
You can tell a Chief, but you can't tell him much:  In QM A school I had four CPOs wired in series try to convince me that significant digits and significant decimal places don't mean sh*t.

567.89 ÷ 2.1 =

Their answer: 270.4238

My answer: 270.4
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Dr. Stan View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dr. Stan Quote  Post ReplyReply Direct Link To This Post Posted: 08 Nov 2017 at 2:20pm
Originally posted by whalen whalen wrote:

You can tell a Chief, but you can't tell him much:  In QM A school I had four CPOs wired in series try to convince me that significant digits and significant decimal places don't mean sh*t.

567.89 ÷ 2.1 =

Their answer: 270.4238

My answer: 270.4


Yeah, that was my answer, too.

4 decimal places:  270.4238
3 decimal places:  270.424
2 decimal places:  270.42
1 decimal place:    270.4

Unfortunately, I have no recollection of who taught me that method.


It has been my experience that folks who have no vices have very few virtues.~Abe Lincoln
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SaltiDawg View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SaltiDawg Quote  Post ReplyReply Direct Link To This Post Posted: 08 Nov 2017 at 8:43pm
Ever use a Slide Rule?


Edited by SaltiDawg - 09 Nov 2017 at 7:19pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote olded Quote  Post ReplyReply Direct Link To This Post Posted: 08 Nov 2017 at 9:09pm
Eever use a Slde Rule?
Yep-Nuc School in '64.  Still have a US Government issued circular slide rule in my tool box, but don't ask me to use it quickly-will need some refresher training!
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Dr. Stan View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dr. Stan Quote  Post ReplyReply Direct Link To This Post Posted: 09 Nov 2017 at 7:12pm
Originally posted by SaltiDawg SaltiDawg wrote:

Ever use a Slde Rule?

Yep.  Nuke prep (which was a 3 week school of the boat taught by one of the chiefs on the Queenfish in a classroom at the San Diego RTC.).  Then Nuke school.  Maybe at NESEP prep at Bainbridge; not sure.  And at Purdue.  Never used it after Purdue.  Carried the useless slide rule around in my ditty bag for many years, thereafter.  Never had an opportunity to use it again.  And now, 55 years later, I don't even remember how to use the thing. 
It has been my experience that folks who have no vices have very few virtues.~Abe Lincoln
SS-393, SSBN-610(B), SSBN-624(G), SSN-591
USSVI Life Member; Holland Club; Plank Owner, Smoky Mtn. Base
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