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Standard for rounding measurements

Discussion in 'Sampling, Standards and Inspection' started by Ryann Hill, Sep 6, 2016.

  1. Ryann Hill

    Ryann Hill New Member

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    Good Morning,
    Does anyone know if there is a standard that discusses rounding of numbers regarding measurements? for example you have a measurement of 12" but want to convert it to mm for labeling purposes.


    Thanks in advance,

    Ryann
     
  2. Miner

    Miner Moderator Staff Member

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  3. tony s

    tony s Well-Known Member

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    Be careful in rounding numbers. Due to rounding, results below can happen:
    upload_2016-9-27_15-51-31.png
     
  4. tony s

    tony s Well-Known Member

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    I'm using this freeware for conversion. Unzip it to use it.
     

    Attached Files: 1. Scan for viruses before using. 2. Report any 'bad' files by reporting this post. 3. Use at your Own Risk:

  5. rmf180

    rmf180 New Member

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    I have worked with customers who treat significant digits as the only rule (3 place print, 3 place results), customers who specify ANSI E29, and others who look at print +1 (3 place print, 4 place result).
     
  6. Eric Twiname

    Eric Twiname Well-Known Member

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    LOL...In my experience, each customer has their own "standard".

    The only across the board standard I've seen is "only round the final result"...see tony s in post #3 above.
     
  7. RoxaneB

    RoxaneB Moderator Staff Member

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    In line with Tony and Eric, I remember the discussion that 1+1 does not always equal 2.

    1.4 rounded = 1 yet:

    1.4+1.4 = 2.8 = 3
     
  8. Bev D

    Bev D Moderator Staff Member

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    things that appear simple really aren't...

    math and intent matter

    significant digits and measurement resolution are critical to 'safe' rounding.
     
  9. Eric Twiname

    Eric Twiname Well-Known Member

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    ...and for playing piano...
    (pause, think about it...)...:p
     
    Bev D likes this.
  10. charanjit singh

    charanjit singh Member

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    When rounding, one must know to what significant decimal place one is permitted to round off. For example, if we are to round off to one decimal place, the second decimal place (if present) will just be ignored if it is '4' or less. But if the second decimal digit is 5 or more, the first decimal digit will be increased by one before dropping the second decimal place.

    In fact this rule applies to any number with any number of decimal places. That is to say that Nth decimal digit should be increased by one if (N+!)th digit is more than 4.
     
  11. Miner

    Miner Moderator Staff Member

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    Andy Nichols likes this.

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