Photoshop: Dimension size of document slightly changing after saving it

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I am saving documents to specific dimensions for a sign company. 

For example, document 1 should be 115cm wide by 130cm high, 300dpi and CMYK. I set all these correctly on the "new" screen. But for some reason when Photoshop 'creates' the document, when I go into Image Size, the dimensions are: 115cm wide by 130.01 cm high. Why has a random "0.1"cm been added?

Document 2: should be 104cm wide by 74cm high (& 300dpi & cmyk). Set these exactly on New screen. When document creates, go to Image Size and the dimensions are: 104cm wide by 74.02 cm high. Why has the "0.2"cm been added?

Any help would be much appreciated.
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Posted 1 month ago

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Photo of David Tristram

David Tristram, Employee

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this does not reproduce for me on Mac with 19.1.1.  I set the dimensions and format as suggested and the image size in Image ==> Image Size... reports the same dimensions exactly.  
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Yves Crausaz

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Il y a un problème de gestion des mesures données en décimal,,,,
Si je choisi le modèle de document A4, les mesures sont correctes en cm, mais pas si je modifie l'unité et choisi les mm !!!

There is a problem of management of the measurements given in decimal ,,,,
If I choose the A4 document template, the measurements are correct in cm, but not if I change the unit and choose the mm !!!
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Eduardo Moura

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I think this difference we see (I've noticed this since the first time I used Ps, back in version 3.0) is related to the fact that we, out of habit, set the print resolution in inches (300ppi) but we use our document dimensions in millimeters or centimeters, as most of the world do. The program then has to make an interpolation to reach the resolution in international units.
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Thanks very much for all responses. 
The sizing issue makes sense, and I can happily 'ignore' it now I know it's not an error of input.